Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

116 files changed, 29707 insertions, 0 deletions

diff --git a/devtools/client/debugger/src/workers/moz.build b/devtools/client/debugger/src/workers/moz.build
new file mode 100644
index 0000000000..12327bf177
--- /dev/null
+++ b/devtools/client/debugger/src/workers/moz.build
@@ -0,0 +1,12 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += [
+    "parser",
+    "pretty-print",
+    "search",
+]
+
+CompiledModules()
diff --git a/devtools/client/debugger/src/workers/parser/findBestMatchExpression.js b/devtools/client/debugger/src/workers/parser/findBestMatchExpression.js
new file mode 100644
index 0000000000..6fd5d5e70e
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/findBestMatchExpression.js
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getInternalSymbols } from "./getSymbols";
+
+function findBestMatchExpression(sourceId, tokenPos) {
+  const symbols = getInternalSymbols(sourceId);
+  if (!symbols) {
+    return null;
+  }
+
+  const { line, column } = tokenPos;
+  const { memberExpressions, identifiers, literals } = symbols;
+
+  function matchExpression(expression) {
+    const { location } = expression;
+    const { start, end } = location;
+    return start.line == line && start.column <= column && end.column >= column;
+  }
+  function matchMemberExpression(expression) {
+    // For member expressions we ignore "computed" member expressions `foo[bar]`,
+    // to only match the one that looks like: `foo.bar`.
+    return !expression.computed && matchExpression(expression);
+  }
+  // Avoid duplicating these arrays and be careful about performance as they can be large
+  //
+  // Process member expressions first as they can be including identifiers which
+  // are subset of the member expression.
+  // Ex: `foo.bar` is a member expression made of `foo` and `bar` identifiers.
+  return (
+    memberExpressions.find(matchMemberExpression) ||
+    literals.find(matchExpression) ||
+    identifiers.find(matchExpression)
+  );
+}
+export default findBestMatchExpression;
diff --git a/devtools/client/debugger/src/workers/parser/findOutOfScopeLocations.js b/devtools/client/debugger/src/workers/parser/findOutOfScopeLocations.js
new file mode 100644
index 0000000000..6c466965c2
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/findOutOfScopeLocations.js
@@ -0,0 +1,132 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { containsLocation, containsPosition } from "./utils/contains";
+
+import { getInternalSymbols } from "./getSymbols";
+
+function findSymbols(source) {
+  const { functions, comments } = getInternalSymbols(source);
+  return { functions, comments };
+}
+
+/**
+ * Returns the location for a given function path. If the path represents a
+ * function declaration, the location will begin after the function identifier
+ * but before the function parameters.
+ */
+
+function getLocation(func) {
+  const location = { ...func.location };
+
+  // if the function has an identifier, start the block after it so the
+  // identifier is included in the "scope" of its parent
+  const identifierEnd = func?.identifier?.loc?.end;
+  if (identifierEnd) {
+    location.start = identifierEnd;
+  }
+
+  return location;
+}
+
+/**
+ * Find the nearest location containing the input position and
+ * return inner locations under that nearest location
+ *
+ * @param {Array<Object>} locations Notice! The locations MUST be sorted by `sortByStart`
+ *                  so that we can do linear time complexity operation.
+ * @returns {Array<Object>}
+ */
+function getInnerLocations(locations, position) {
+  // First, let's find the nearest position-enclosing function location,
+  // which is to find the last location enclosing the position.
+  let parentIndex;
+  for (let i = locations.length - 1; i >= 0; i--) {
+    const loc = locations[i];
+    if (containsPosition(loc, position)) {
+      parentIndex = i;
+      break;
+    }
+  }
+
+  if (parentIndex == undefined) {
+    return [];
+  }
+  const parentLoc = locations[parentIndex];
+
+  // Then, from the nearest location, loop locations again and put locations into
+  // the innerLocations array until we get to a location not enclosed by the nearest location.
+  const innerLocations = [];
+  for (let i = parentIndex + 1; i < locations.length; i++) {
+    const loc = locations[i];
+    if (!containsLocation(parentLoc, loc)) {
+      break;
+    }
+
+    innerLocations.push(loc);
+  }
+
+  return innerLocations;
+}
+
+/**
+ * Return an new locations array which excludes
+ * items that are completely enclosed by another location in the input locations
+ *
+ * @param locations Notice! The locations MUST be sorted by `sortByStart`
+ *                  so that we can do linear time complexity operation.
+ */
+function removeOverlaps(locations) {
+  if (!locations.length) {
+    return [];
+  }
+  const firstParent = locations[0];
+  return locations.reduce(deduplicateNode, [firstParent]);
+}
+
+function deduplicateNode(nodes, location) {
+  const parent = nodes[nodes.length - 1];
+  if (!containsLocation(parent, location)) {
+    nodes.push(location);
+  }
+  return nodes;
+}
+
+/**
+ * Sorts an array of locations by start position
+ */
+function sortByStart(a, b) {
+  if (a.start.line < b.start.line) {
+    return -1;
+  } else if (a.start.line === b.start.line) {
+    return a.start.column - b.start.column;
+  }
+
+  return 1;
+}
+
+/**
+ * Returns an array of locations that are considered out of scope for the given
+ * location.
+ */
+function findOutOfScopeLocations(location) {
+  const { functions, comments } = findSymbols(location.source.id);
+  const commentLocations = comments.map(c => c.location);
+  const locations = functions
+    .map(getLocation)
+    .concat(commentLocations)
+    .sort(sortByStart);
+
+  const innerLocations = getInnerLocations(locations, location);
+  const outerLocations = locations.filter(loc => {
+    if (innerLocations.includes(loc)) {
+      return false;
+    }
+
+    return !containsPosition(loc, location);
+  });
+  return removeOverlaps(outerLocations);
+}
+
+export default findOutOfScopeLocations;
diff --git a/devtools/client/debugger/src/workers/parser/frameworks.js b/devtools/client/debugger/src/workers/parser/frameworks.js
new file mode 100644
index 0000000000..aacaa5186f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/frameworks.js
@@ -0,0 +1,60 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+
+export function getFramework(symbols) {
+  if (isReactComponent(symbols)) {
+    return "React";
+  }
+  if (isAngularComponent(symbols)) {
+    return "Angular";
+  }
+  if (isVueComponent(symbols)) {
+    return "Vue";
+  }
+
+  return null;
+}
+
+function isReactComponent({ importsReact, classes, identifiers }) {
+  return (
+    importsReact ||
+    extendsReactComponent(classes) ||
+    isReact(identifiers) ||
+    isRedux(identifiers)
+  );
+}
+
+function extendsReactComponent(classes) {
+  return classes.some(
+    classObj =>
+      t.isIdentifier(classObj.parent, { name: "Component" }) ||
+      t.isIdentifier(classObj.parent, { name: "PureComponent" }) ||
+      (t.isMemberExpression(classObj.parent, { computed: false }) &&
+        t.isIdentifier(classObj.parent, { name: "Component" }))
+  );
+}
+
+function isAngularComponent({ memberExpressions }) {
+  return memberExpressions.some(
+    item =>
+      item.expression == "angular.controller" ||
+      item.expression == "angular.module"
+  );
+}
+
+function isVueComponent({ identifiers }) {
+  return identifiers.some(identifier => identifier.name == "Vue");
+}
+
+/* This identifies the react lib file */
+function isReact(identifiers) {
+  return identifiers.some(identifier => identifier.name == "isReactComponent");
+}
+
+/* This identifies the redux lib file */
+function isRedux(identifiers) {
+  return identifiers.some(identifier => identifier.name == "Redux");
+}
diff --git a/devtools/client/debugger/src/workers/parser/getScopes/index.js b/devtools/client/debugger/src/workers/parser/getScopes/index.js
new file mode 100644
index 0000000000..82631ab614
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/getScopes/index.js
@@ -0,0 +1,65 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { buildScopeList, parseSourceScopes } from "./visitor";
+
+const parsedScopesCache = new Map();
+
+export default function getScopes(location) {
+  const sourceId = location.source.id;
+  let parsedScopes = parsedScopesCache.get(sourceId);
+  if (!parsedScopes) {
+    parsedScopes = parseSourceScopes(sourceId);
+    parsedScopesCache.set(sourceId, parsedScopes);
+  }
+  return parsedScopes ? findScopes(parsedScopes, location) : [];
+}
+
+export function clearScopes(sourceIds) {
+  for (const sourceId of sourceIds) {
+    parsedScopesCache.delete(sourceId);
+  }
+}
+
+export { buildScopeList };
+
+/**
+ * Searches all scopes and their bindings at the specific location.
+ */
+function findScopes(scopes, location) {
+  // Find inner most in the tree structure.
+  let searchInScopes = scopes;
+  const found = [];
+  while (searchInScopes) {
+    const foundOne = searchInScopes.some(s => {
+      if (
+        compareLocations(s.start, location) <= 0 &&
+        compareLocations(location, s.end) < 0
+      ) {
+        // Found the next scope, trying to search recusevly in its children.
+        found.unshift(s);
+        searchInScopes = s.children;
+        return true;
+      }
+      return false;
+    });
+    if (!foundOne) {
+      break;
+    }
+  }
+  return found.map(i => ({
+    type: i.type,
+    scopeKind: i.scopeKind,
+    displayName: i.displayName,
+    start: i.start,
+    end: i.end,
+    bindings: i.bindings,
+  }));
+}
+
+function compareLocations(a, b) {
+  // According to type of Location.column can be undefined, if will not be the
+  // case here, ignoring flow error.
+  return a.line == b.line ? a.column - b.column : a.line - b.line;
+}
diff --git a/devtools/client/debugger/src/workers/parser/getScopes/visitor.js b/devtools/client/debugger/src/workers/parser/getScopes/visitor.js
new file mode 100644
index 0000000000..8046c7e89d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/getScopes/visitor.js
@@ -0,0 +1,909 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+
+import getFunctionName from "../utils/getFunctionName";
+import { getAst } from "../utils/ast";
+
+/**
+ * "implicit"
+ * Variables added automaticly like "this" and "arguments"
+ *
+ * "var"
+ * Variables declared with "var" or non-block function declarations
+ *
+ * "let"
+ * Variables declared with "let".
+ *
+ * "const"
+ * Variables declared with "const", or added as const
+ * bindings like inner function expressions and inner class names.
+ *
+ * "import"
+ * Imported binding names exposed from other modules.
+ *
+ * "global"
+ * Variables that reference undeclared global values.
+ */
+
+// Location information about the expression immediartely surrounding a
+// given binding reference.
+
+function isGeneratedId(id) {
+  return !/\/originalSource/.test(id);
+}
+
+export function parseSourceScopes(sourceId) {
+  const ast = getAst(sourceId);
+  if (!ast || !Object.keys(ast).length) {
+    return null;
+  }
+
+  return buildScopeList(ast, sourceId);
+}
+
+export function buildScopeList(ast, sourceId) {
+  const { global, lexical } = createGlobalScope(ast, sourceId);
+
+  const state = {
+    // The id for the source that scope list is generated for
+    sourceId,
+
+    // A map of any free variables(variables which are used within the current scope but not
+    // declared within the scope). This changes when a new scope is created.
+    freeVariables: new Map(),
+
+    // A stack of all the free variables created across all the scopes that have
+    // been created.
+    freeVariableStack: [],
+
+    inType: null,
+
+    // The current scope, a new scope is potentially created on a visit to each node
+    // depending in the criteria. Initially set to the lexical global scope which is the
+    // child to the global scope.
+    scope: lexical,
+
+    // A stack of all the existing scopes, this is mainly used retrieve the parent scope
+    // (which is the last scope push onto the stack) on exiting a visited node.
+    scopeStack: [],
+
+    declarationBindingIds: new Set(),
+  };
+  t.traverse(ast, scopeCollectionVisitor, state);
+
+  for (const [key, freeVariables] of state.freeVariables) {
+    let binding = global.bindings[key];
+    if (!binding) {
+      binding = {
+        type: "global",
+        refs: [],
+      };
+      global.bindings[key] = binding;
+    }
+
+    binding.refs = freeVariables.concat(binding.refs);
+  }
+
+  // TODO: This should probably check for ".mjs" extension on the
+  // original file, and should also be skipped if the the generated
+  // code is an ES6 module rather than a script.
+  if (
+    isGeneratedId(sourceId) ||
+    (ast.program.sourceType === "script" && !looksLikeCommonJS(global))
+  ) {
+    stripModuleScope(global);
+  }
+
+  return toParsedScopes([global], sourceId) || [];
+}
+
+function toParsedScopes(children, sourceId) {
+  if (!children || children.length === 0) {
+    return undefined;
+  }
+  return children.map(scope => ({
+    // Removing unneed information from TempScope such as parent reference.
+    // We also need to convert BabelLocation to the Location type.
+    start: scope.loc.start,
+    end: scope.loc.end,
+    type:
+      scope.type === "module" || scope.type === "function-body"
+        ? "block"
+        : scope.type,
+    scopeKind: "",
+    displayName: scope.displayName,
+    bindings: scope.bindings,
+    children: toParsedScopes(scope.children, sourceId),
+  }));
+}
+
+/**
+ * Create a new scope object and link the scope to it parent.
+ *
+ * @param {String} type - scope type
+ * @param {String} displayName - The scope display name
+ * @param {Object} parent - The parent object scope
+ * @param {Object} loc - The start and end postions (line/columns) of the scope
+ * @returns {Object} The newly created scope
+ */
+function createTempScope(type, displayName, parent, loc) {
+  const scope = {
+    type,
+    displayName,
+    parent,
+
+    // A list of all the child scopes
+    children: [],
+    loc,
+
+    // All the bindings defined in this scope
+    // bindings = [binding, ...]
+    // binding = { type: "", refs: []}
+    bindings: Object.create(null),
+  };
+
+  if (parent) {
+    parent.children.push(scope);
+  }
+  return scope;
+}
+
+// Sets a new current scope and creates a new map to store the free variables
+// that may exist in this scope.
+function pushTempScope(state, type, displayName, loc) {
+  const scope = createTempScope(type, displayName, state.scope, loc);
+
+  state.scope = scope;
+
+  state.freeVariableStack.push(state.freeVariables);
+  state.freeVariables = new Map();
+  return scope;
+}
+
+function isNode(node, type) {
+  return node ? node.type === type : false;
+}
+
+// Walks up the scope tree to the top most variable scope
+function getVarScope(scope) {
+  let s = scope;
+  while (s.type !== "function" && s.type !== "module") {
+    if (!s.parent) {
+      return s;
+    }
+    s = s.parent;
+  }
+  return s;
+}
+
+function fromBabelLocation(location, sourceId) {
+  return {
+    sourceId,
+    line: location.line,
+    column: location.column,
+  };
+}
+
+function parseDeclarator(
+  declaratorId,
+  targetScope,
+  type,
+  locationType,
+  declaration,
+  state
+) {
+  if (isNode(declaratorId, "Identifier")) {
+    let existing = targetScope.bindings[declaratorId.name];
+    if (!existing) {
+      existing = {
+        type,
+        refs: [],
+      };
+      targetScope.bindings[declaratorId.name] = existing;
+    }
+    state.declarationBindingIds.add(declaratorId);
+    existing.refs.push({
+      type: locationType,
+      start: fromBabelLocation(declaratorId.loc.start, state.sourceId),
+      end: fromBabelLocation(declaratorId.loc.end, state.sourceId),
+      declaration: {
+        start: fromBabelLocation(declaration.loc.start, state.sourceId),
+        end: fromBabelLocation(declaration.loc.end, state.sourceId),
+      },
+    });
+  } else if (isNode(declaratorId, "ObjectPattern")) {
+    declaratorId.properties.forEach(prop => {
+      parseDeclarator(
+        prop.value,
+        targetScope,
+        type,
+        locationType,
+        declaration,
+        state
+      );
+    });
+  } else if (isNode(declaratorId, "ArrayPattern")) {
+    declaratorId.elements.forEach(item => {
+      parseDeclarator(
+        item,
+        targetScope,
+        type,
+        locationType,
+        declaration,
+        state
+      );
+    });
+  } else if (isNode(declaratorId, "AssignmentPattern")) {
+    parseDeclarator(
+      declaratorId.left,
+      targetScope,
+      type,
+      locationType,
+      declaration,
+      state
+    );
+  } else if (isNode(declaratorId, "RestElement")) {
+    parseDeclarator(
+      declaratorId.argument,
+      targetScope,
+      type,
+      locationType,
+      declaration,
+      state
+    );
+  } else if (t.isTSParameterProperty(declaratorId)) {
+    parseDeclarator(
+      declaratorId.parameter,
+      targetScope,
+      type,
+      locationType,
+      declaration,
+      state
+    );
+  }
+}
+
+function isLetOrConst(node) {
+  return node.kind === "let" || node.kind === "const";
+}
+
+function hasLexicalDeclaration(node, parent) {
+  const nodes = [];
+  if (t.isSwitchStatement(node)) {
+    for (const caseNode of node.cases) {
+      nodes.push(...caseNode.consequent);
+    }
+  } else {
+    nodes.push(...node.body);
+  }
+
+  const isFunctionBody = t.isFunction(parent, { body: node });
+
+  return nodes.some(
+    child =>
+      isLexicalVariable(child) ||
+      t.isClassDeclaration(child) ||
+      (!isFunctionBody && t.isFunctionDeclaration(child))
+  );
+}
+function isLexicalVariable(node) {
+  return isNode(node, "VariableDeclaration") && isLetOrConst(node);
+}
+
+// Creates the global scopes for this source, the overall global scope
+// and a lexical global scope.
+function createGlobalScope(ast, sourceId) {
+  const global = createTempScope("object", "Global", null, {
+    start: fromBabelLocation(ast.loc.start, sourceId),
+    end: fromBabelLocation(ast.loc.end, sourceId),
+  });
+
+  const lexical = createTempScope("block", "Lexical Global", global, {
+    start: fromBabelLocation(ast.loc.start, sourceId),
+    end: fromBabelLocation(ast.loc.end, sourceId),
+  });
+
+  return { global, lexical };
+}
+
+const scopeCollectionVisitor = {
+  // eslint-disable-next-line complexity
+  enter(node, ancestors, state) {
+    state.scopeStack.push(state.scope);
+
+    const parentNode =
+      ancestors.length === 0 ? null : ancestors[ancestors.length - 1].node;
+
+    if (state.inType) {
+      return;
+    }
+
+    if (t.isProgram(node)) {
+      const scope = pushTempScope(state, "module", "Module", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+      scope.bindings.this = {
+        type: "implicit",
+        refs: [],
+      };
+    } else if (t.isFunction(node)) {
+      let { scope } = state;
+
+      if (t.isFunctionExpression(node) && isNode(node.id, "Identifier")) {
+        scope = pushTempScope(state, "block", "Function Expression", {
+          start: fromBabelLocation(node.loc.start, state.sourceId),
+          end: fromBabelLocation(node.loc.end, state.sourceId),
+        });
+        state.declarationBindingIds.add(node.id);
+        scope.bindings[node.id.name] = {
+          type: "const",
+          refs: [
+            {
+              type: "fn-expr",
+              start: fromBabelLocation(node.id.loc.start, state.sourceId),
+              end: fromBabelLocation(node.id.loc.end, state.sourceId),
+              declaration: {
+                start: fromBabelLocation(node.loc.start, state.sourceId),
+                end: fromBabelLocation(node.loc.end, state.sourceId),
+              },
+            },
+          ],
+        };
+      }
+
+      if (t.isFunctionDeclaration(node) && isNode(node.id, "Identifier")) {
+        // This ignores Annex B function declaration hoisting, which
+        // is probably a fine assumption.
+        state.declarationBindingIds.add(node.id);
+        const refs = [
+          {
+            type: "fn-decl",
+            start: fromBabelLocation(node.id.loc.start, state.sourceId),
+            end: fromBabelLocation(node.id.loc.end, state.sourceId),
+            declaration: {
+              start: fromBabelLocation(node.loc.start, state.sourceId),
+              end: fromBabelLocation(node.loc.end, state.sourceId),
+            },
+          },
+        ];
+
+        if (scope.type === "block") {
+          scope.bindings[node.id.name] = {
+            type: "let",
+            refs,
+          };
+        } else {
+          // Add the binding to the ancestor scope
+          getVarScope(scope).bindings[node.id.name] = {
+            type: "var",
+            refs,
+          };
+        }
+      }
+
+      scope = pushTempScope(
+        state,
+        "function",
+        getFunctionName(node, parentNode),
+        {
+          // Being at the start of a function doesn't count as
+          // being inside of it.
+          start: fromBabelLocation(
+            node.params[0] ? node.params[0].loc.start : node.loc.start,
+            state.sourceId
+          ),
+          end: fromBabelLocation(node.loc.end, state.sourceId),
+        }
+      );
+
+      node.params.forEach(param =>
+        parseDeclarator(param, scope, "var", "fn-param", node, state)
+      );
+
+      if (!t.isArrowFunctionExpression(node)) {
+        scope.bindings.this = {
+          type: "implicit",
+          refs: [],
+        };
+        scope.bindings.arguments = {
+          type: "implicit",
+          refs: [],
+        };
+      }
+
+      if (
+        t.isBlockStatement(node.body) &&
+        hasLexicalDeclaration(node.body, node)
+      ) {
+        scope = pushTempScope(state, "function-body", "Function Body", {
+          start: fromBabelLocation(node.body.loc.start, state.sourceId),
+          end: fromBabelLocation(node.body.loc.end, state.sourceId),
+        });
+      }
+    } else if (t.isClass(node)) {
+      if (t.isIdentifier(node.id)) {
+        // For decorated classes, the AST considers the first the decorator
+        // to be the start of the class. For the purposes of mapping class
+        // declarations however, we really want to look for the "class Foo"
+        // piece. To achieve that, we estimate the location of the declaration
+        // instead.
+        let declStart = node.loc.start;
+        if (node.decorators && node.decorators.length) {
+          // Estimate the location of the "class" keyword since it
+          // is unlikely to be a different line than the class name.
+          declStart = {
+            line: node.id.loc.start.line,
+            column: node.id.loc.start.column - "class ".length,
+          };
+        }
+
+        const declaration = {
+          start: fromBabelLocation(declStart, state.sourceId),
+          end: fromBabelLocation(node.loc.end, state.sourceId),
+        };
+
+        if (t.isClassDeclaration(node)) {
+          state.declarationBindingIds.add(node.id);
+          state.scope.bindings[node.id.name] = {
+            type: "let",
+            refs: [
+              {
+                type: "class-decl",
+                start: fromBabelLocation(node.id.loc.start, state.sourceId),
+                end: fromBabelLocation(node.id.loc.end, state.sourceId),
+                declaration,
+              },
+            ],
+          };
+        }
+
+        const scope = pushTempScope(state, "block", "Class", {
+          start: fromBabelLocation(node.loc.start, state.sourceId),
+          end: fromBabelLocation(node.loc.end, state.sourceId),
+        });
+
+        state.declarationBindingIds.add(node.id);
+        scope.bindings[node.id.name] = {
+          type: "const",
+          refs: [
+            {
+              type: "class-inner",
+              start: fromBabelLocation(node.id.loc.start, state.sourceId),
+              end: fromBabelLocation(node.id.loc.end, state.sourceId),
+              declaration,
+            },
+          ],
+        };
+      }
+    } else if (t.isForXStatement(node) || t.isForStatement(node)) {
+      const init = node.init || node.left;
+      if (isNode(init, "VariableDeclaration") && isLetOrConst(init)) {
+        // Debugger will create new lexical environment for the for.
+        pushTempScope(state, "block", "For", {
+          // Being at the start of a for loop doesn't count as
+          // being inside it.
+          start: fromBabelLocation(init.loc.start, state.sourceId),
+          end: fromBabelLocation(node.loc.end, state.sourceId),
+        });
+      }
+    } else if (t.isCatchClause(node)) {
+      const scope = pushTempScope(state, "block", "Catch", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+      parseDeclarator(node.param, scope, "var", "catch", node, state);
+    } else if (
+      t.isBlockStatement(node) &&
+      // Function body's are handled in the function logic above.
+      !t.isFunction(parentNode) &&
+      hasLexicalDeclaration(node, parentNode)
+    ) {
+      // Debugger will create new lexical environment for the block.
+      pushTempScope(state, "block", "Block", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+    } else if (
+      t.isVariableDeclaration(node) &&
+      (node.kind === "var" ||
+        // Lexical declarations in for statements are handled above.
+        !t.isForStatement(parentNode, { init: node }) ||
+        !t.isForXStatement(parentNode, { left: node }))
+    ) {
+      // Finds right lexical environment
+      const hoistAt = !isLetOrConst(node)
+        ? getVarScope(state.scope)
+        : state.scope;
+      node.declarations.forEach(declarator => {
+        parseDeclarator(
+          declarator.id,
+          hoistAt,
+          node.kind,
+          node.kind,
+          node,
+          state
+        );
+      });
+    } else if (
+      t.isImportDeclaration(node) &&
+      (!node.importKind || node.importKind === "value")
+    ) {
+      node.specifiers.forEach(spec => {
+        if (spec.importKind && spec.importKind !== "value") {
+          return;
+        }
+
+        if (t.isImportNamespaceSpecifier(spec)) {
+          state.declarationBindingIds.add(spec.local);
+
+          state.scope.bindings[spec.local.name] = {
+            // Imported namespaces aren't live import bindings, they are
+            // just normal const bindings.
+            type: "const",
+            refs: [
+              {
+                type: "import-ns-decl",
+                start: fromBabelLocation(spec.local.loc.start, state.sourceId),
+                end: fromBabelLocation(spec.local.loc.end, state.sourceId),
+                declaration: {
+                  start: fromBabelLocation(node.loc.start, state.sourceId),
+                  end: fromBabelLocation(node.loc.end, state.sourceId),
+                },
+              },
+            ],
+          };
+        } else {
+          state.declarationBindingIds.add(spec.local);
+
+          state.scope.bindings[spec.local.name] = {
+            type: "import",
+            refs: [
+              {
+                type: "import-decl",
+                start: fromBabelLocation(spec.local.loc.start, state.sourceId),
+                end: fromBabelLocation(spec.local.loc.end, state.sourceId),
+                importName: t.isImportDefaultSpecifier(spec)
+                  ? "default"
+                  : spec.imported.name,
+                declaration: {
+                  start: fromBabelLocation(node.loc.start, state.sourceId),
+                  end: fromBabelLocation(node.loc.end, state.sourceId),
+                },
+              },
+            ],
+          };
+        }
+      });
+    } else if (t.isTSEnumDeclaration(node)) {
+      state.declarationBindingIds.add(node.id);
+      state.scope.bindings[node.id.name] = {
+        type: "const",
+        refs: [
+          {
+            type: "ts-enum-decl",
+            start: fromBabelLocation(node.id.loc.start, state.sourceId),
+            end: fromBabelLocation(node.id.loc.end, state.sourceId),
+            declaration: {
+              start: fromBabelLocation(node.loc.start, state.sourceId),
+              end: fromBabelLocation(node.loc.end, state.sourceId),
+            },
+          },
+        ],
+      };
+    } else if (t.isTSModuleDeclaration(node)) {
+      state.declarationBindingIds.add(node.id);
+      state.scope.bindings[node.id.name] = {
+        type: "const",
+        refs: [
+          {
+            type: "ts-namespace-decl",
+            start: fromBabelLocation(node.id.loc.start, state.sourceId),
+            end: fromBabelLocation(node.id.loc.end, state.sourceId),
+            declaration: {
+              start: fromBabelLocation(node.loc.start, state.sourceId),
+              end: fromBabelLocation(node.loc.end, state.sourceId),
+            },
+          },
+        ],
+      };
+    } else if (t.isTSModuleBlock(node)) {
+      pushTempScope(state, "block", "TypeScript Namespace", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+    } else if (
+      t.isIdentifier(node) &&
+      t.isReferenced(node, parentNode) &&
+      // Babel doesn't cover this in 'isReferenced' yet, but it should
+      // eventually.
+      !t.isTSEnumMember(parentNode, { id: node }) &&
+      !t.isTSModuleDeclaration(parentNode, { id: node }) &&
+      // isReferenced above fails to see `var { foo } = ...` as a non-reference
+      // because the direct parent is not enough to know that the pattern is
+      // used within a variable declaration.
+      !state.declarationBindingIds.has(node)
+    ) {
+      let freeVariables = state.freeVariables.get(node.name);
+      if (!freeVariables) {
+        freeVariables = [];
+        state.freeVariables.set(node.name, freeVariables);
+      }
+
+      freeVariables.push({
+        type: "ref",
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+        meta: buildMetaBindings(state.sourceId, node, ancestors),
+      });
+    } else if (isOpeningJSXIdentifier(node, ancestors)) {
+      let freeVariables = state.freeVariables.get(node.name);
+      if (!freeVariables) {
+        freeVariables = [];
+        state.freeVariables.set(node.name, freeVariables);
+      }
+
+      freeVariables.push({
+        type: "ref",
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+        meta: buildMetaBindings(state.sourceId, node, ancestors),
+      });
+    } else if (t.isThisExpression(node)) {
+      let freeVariables = state.freeVariables.get("this");
+      if (!freeVariables) {
+        freeVariables = [];
+        state.freeVariables.set("this", freeVariables);
+      }
+
+      freeVariables.push({
+        type: "ref",
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+        meta: buildMetaBindings(state.sourceId, node, ancestors),
+      });
+    } else if (t.isClassProperty(parentNode, { value: node })) {
+      const scope = pushTempScope(state, "function", "Class Field", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+      scope.bindings.this = {
+        type: "implicit",
+        refs: [],
+      };
+      scope.bindings.arguments = {
+        type: "implicit",
+        refs: [],
+      };
+    } else if (
+      t.isSwitchStatement(node) &&
+      hasLexicalDeclaration(node, parentNode)
+    ) {
+      pushTempScope(state, "block", "Switch", {
+        start: fromBabelLocation(node.loc.start, state.sourceId),
+        end: fromBabelLocation(node.loc.end, state.sourceId),
+      });
+    }
+
+    if (
+      // In general Flow expressions are deleted, so they can't contain
+      // runtime bindings, but typecasts are the one exception there.
+      (t.isFlow(node) && !t.isTypeCastExpression(node)) ||
+      // In general TS items are deleted, but TS has a few wrapper node
+      // types that can contain general JS expressions.
+      (node.type.startsWith("TS") &&
+        !t.isTSTypeAssertion(node) &&
+        !t.isTSAsExpression(node) &&
+        !t.isTSNonNullExpression(node) &&
+        !t.isTSModuleDeclaration(node) &&
+        !t.isTSModuleBlock(node) &&
+        !t.isTSParameterProperty(node) &&
+        !t.isTSExportAssignment(node))
+    ) {
+      // Flag this node as a root "type" node. All items inside of this
+      // will be skipped entirely.
+      state.inType = node;
+    }
+  },
+  exit(node, ancestors, state) {
+    const currentScope = state.scope;
+    const parentScope = state.scopeStack.pop();
+    if (!parentScope) {
+      throw new Error("Assertion failure - unsynchronized pop");
+    }
+    state.scope = parentScope;
+
+    // It is possible, as in the case of function expressions, that a single
+    // node has added multiple scopes, so we need to traverse upward here
+    // rather than jumping stright to 'parentScope'.
+    for (
+      let scope = currentScope;
+      scope && scope !== parentScope;
+      scope = scope.parent
+    ) {
+      const { freeVariables } = state;
+      state.freeVariables = state.freeVariableStack.pop();
+      const parentFreeVariables = state.freeVariables;
+
+      // Match up any free variables that match this scope's bindings and
+      // merge then into the refs.
+      for (const key of Object.keys(scope.bindings)) {
+        const binding = scope.bindings[key];
+
+        const freeVars = freeVariables.get(key);
+        if (freeVars) {
+          binding.refs.push(...freeVars);
+          freeVariables.delete(key);
+        }
+      }
+
+      // Move any undeclared references in this scope into the parent for
+      // processing in higher scopes.
+      for (const [key, value] of freeVariables) {
+        let refs = parentFreeVariables.get(key);
+        if (!refs) {
+          refs = [];
+          parentFreeVariables.set(key, refs);
+        }
+
+        refs.push(...value);
+      }
+    }
+
+    if (state.inType === node) {
+      state.inType = null;
+    }
+  },
+};
+
+function isOpeningJSXIdentifier(node, ancestors) {
+  if (!t.isJSXIdentifier(node)) {
+    return false;
+  }
+
+  for (let i = ancestors.length - 1; i >= 0; i--) {
+    const { node: parent, key } = ancestors[i];
+
+    if (t.isJSXOpeningElement(parent) && key === "name") {
+      return true;
+    } else if (!t.isJSXMemberExpression(parent) || key !== "object") {
+      break;
+    }
+  }
+
+  return false;
+}
+
+function buildMetaBindings(
+  sourceId,
+  node,
+  ancestors,
+  parentIndex = ancestors.length - 1
+) {
+  if (parentIndex <= 1) {
+    return null;
+  }
+  const parent = ancestors[parentIndex].node;
+  const grandparent = ancestors[parentIndex - 1].node;
+
+  // Consider "0, foo" to be equivalent to "foo".
+  if (
+    t.isSequenceExpression(parent) &&
+    parent.expressions.length === 2 &&
+    t.isNumericLiteral(parent.expressions[0]) &&
+    parent.expressions[1] === node
+  ) {
+    let { start, end } = parent.loc;
+
+    if (t.isCallExpression(grandparent, { callee: parent })) {
+      // Attempt to expand the range around parentheses, e.g.
+      // (0, foo.bar)()
+      start = grandparent.loc.start;
+      end = Object.assign({}, end);
+      end.column += 1;
+    }
+
+    return {
+      type: "inherit",
+      start: fromBabelLocation(start, sourceId),
+      end: fromBabelLocation(end, sourceId),
+      parent: buildMetaBindings(sourceId, parent, ancestors, parentIndex - 1),
+    };
+  }
+
+  // Consider "Object(foo)", and "__webpack_require__.i(foo)" to be
+  // equivalent to "foo" since they are essentially identity functions.
+  if (
+    t.isCallExpression(parent) &&
+    (t.isIdentifier(parent.callee, { name: "Object" }) ||
+      (t.isMemberExpression(parent.callee, { computed: false }) &&
+        t.isIdentifier(parent.callee.object, { name: "__webpack_require__" }) &&
+        t.isIdentifier(parent.callee.property, { name: "i" }))) &&
+    parent.arguments.length === 1 &&
+    parent.arguments[0] === node
+  ) {
+    return {
+      type: "inherit",
+      start: fromBabelLocation(parent.loc.start, sourceId),
+      end: fromBabelLocation(parent.loc.end, sourceId),
+      parent: buildMetaBindings(sourceId, parent, ancestors, parentIndex - 1),
+    };
+  }
+
+  if (t.isMemberExpression(parent, { object: node })) {
+    if (parent.computed) {
+      if (t.isStringLiteral(parent.property)) {
+        return {
+          type: "member",
+          start: fromBabelLocation(parent.loc.start, sourceId),
+          end: fromBabelLocation(parent.loc.end, sourceId),
+          property: parent.property.value,
+          parent: buildMetaBindings(
+            sourceId,
+            parent,
+            ancestors,
+            parentIndex - 1
+          ),
+        };
+      }
+    } else {
+      return {
+        type: "member",
+        start: fromBabelLocation(parent.loc.start, sourceId),
+        end: fromBabelLocation(parent.loc.end, sourceId),
+        property: parent.property.name,
+        parent: buildMetaBindings(sourceId, parent, ancestors, parentIndex - 1),
+      };
+    }
+  }
+  if (
+    t.isCallExpression(parent, { callee: node }) &&
+    !parent.arguments.length
+  ) {
+    return {
+      type: "call",
+      start: fromBabelLocation(parent.loc.start, sourceId),
+      end: fromBabelLocation(parent.loc.end, sourceId),
+      parent: buildMetaBindings(sourceId, parent, ancestors, parentIndex - 1),
+    };
+  }
+
+  return null;
+}
+
+function looksLikeCommonJS(rootScope) {
+  const hasRefs = name =>
+    rootScope.bindings[name] && !!rootScope.bindings[name].refs.length;
+
+  return (
+    hasRefs("__dirname") ||
+    hasRefs("__filename") ||
+    hasRefs("require") ||
+    hasRefs("exports") ||
+    hasRefs("module")
+  );
+}
+
+function stripModuleScope(rootScope) {
+  const rootLexicalScope = rootScope.children[0];
+  const moduleScope = rootLexicalScope.children[0];
+  if (moduleScope.type !== "module") {
+    throw new Error("Assertion failure - should be module");
+  }
+
+  Object.keys(moduleScope.bindings).forEach(name => {
+    const binding = moduleScope.bindings[name];
+    if (binding.type === "let" || binding.type === "const") {
+      rootLexicalScope.bindings[name] = binding;
+    } else {
+      rootScope.bindings[name] = binding;
+    }
+  });
+  rootLexicalScope.children = moduleScope.children;
+  rootLexicalScope.children.forEach(child => {
+    child.parent = rootLexicalScope;
+  });
+}
diff --git a/devtools/client/debugger/src/workers/parser/getSymbols.js b/devtools/client/debugger/src/workers/parser/getSymbols.js
new file mode 100644
index 0000000000..fb288adcfb
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/getSymbols.js
@@ -0,0 +1,567 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+
+import createSimplePath from "./utils/simple-path";
+import { traverseAst } from "./utils/ast";
+import {
+  isFunction,
+  isObjectShorthand,
+  isComputedExpression,
+  getObjectExpressionValue,
+  addPatternIdentifiers,
+  getComments,
+  getCode,
+  nodeLocationKey,
+  getFunctionParameterNames,
+} from "./utils/helpers";
+
+import { inferClassName } from "./utils/inferClassName";
+import getFunctionName from "./utils/getFunctionName";
+import { getFramework } from "./frameworks";
+
+const symbolDeclarations = new Map();
+
+function extractFunctionSymbol(path, state, symbols) {
+  const name = getFunctionName(path.node, path.parent);
+
+  if (!state.fnCounts[name]) {
+    state.fnCounts[name] = 0;
+  }
+  const index = state.fnCounts[name]++;
+  symbols.functions.push({
+    name,
+    klass: inferClassName(path),
+    location: path.node.loc,
+    parameterNames: getFunctionParameterNames(path),
+    identifier: path.node.id,
+    // indicates the occurence of the function in a file
+    // e.g { name: foo, ... index: 4 } is the 4th foo function
+    // in the file
+    index,
+  });
+}
+
+function extractSymbol(path, symbols, state) {
+  if (isFunction(path)) {
+    extractFunctionSymbol(path, state, symbols);
+  }
+
+  if (t.isJSXElement(path)) {
+    symbols.hasJsx = true;
+  }
+
+  if (t.isGenericTypeAnnotation(path)) {
+    symbols.hasTypes = true;
+  }
+
+  if (t.isClassDeclaration(path)) {
+    symbols.classes.push(getClassDeclarationSymbol(path.node));
+  }
+
+  if (!symbols.importsReact) {
+    if (t.isImportDeclaration(path)) {
+      symbols.importsReact = isReactImport(path.node);
+    } else if (t.isCallExpression(path)) {
+      symbols.importsReact = isReactRequire(path.node);
+    }
+  }
+
+  if (t.isMemberExpression(path) || t.isOptionalMemberExpression(path)) {
+    symbols.memberExpressions.push(getMemberExpressionSymbol(path));
+  }
+
+  if (
+    (t.isStringLiteral(path) || t.isNumericLiteral(path)) &&
+    t.isMemberExpression(path.parentPath)
+  ) {
+    // We only need literals that are part of computed memeber expressions
+    const { start, end } = path.node.loc;
+    symbols.literals.push({
+      location: { start, end },
+      get expression() {
+        delete this.expression;
+        this.expression = getSnippet(path.parentPath);
+        return this.expression;
+      },
+    });
+  }
+
+  getIdentifierSymbols(symbols.identifiers, symbols.identifiersKeys, path);
+}
+
+function extractSymbols(sourceId) {
+  const symbols = {
+    functions: [],
+    memberExpressions: [],
+    comments: [],
+    identifiers: [],
+    // This holds a set of unique identifier location key (string)
+    // It helps registering only the first identifier when there is duplicated ones for the same location.
+    identifiersKeys: new Set(),
+    classes: [],
+    literals: [],
+    hasJsx: false,
+    hasTypes: false,
+    framework: undefined,
+    importsReact: false,
+  };
+
+  const state = {
+    fnCounts: Object.create(null),
+  };
+
+  const ast = traverseAst(sourceId, {
+    enter(node, ancestors) {
+      try {
+        const path = createSimplePath(ancestors);
+        if (path) {
+          extractSymbol(path, symbols, state);
+        }
+      } catch (e) {
+        console.error(e);
+      }
+    },
+  });
+
+  // comments are extracted separately from the AST
+  symbols.comments = getComments(ast);
+  symbols.framework = getFramework(symbols);
+
+  return symbols;
+}
+
+function extendSnippet(name, expression, path, prevPath) {
+  const computed = path?.node.computed;
+  const optional = path?.node.optional;
+  const prevComputed = prevPath?.node.computed;
+  const prevArray = t.isArrayExpression(prevPath);
+  const array = t.isArrayExpression(path);
+  const value = path?.node.property?.extra?.raw || "";
+
+  if (expression === "") {
+    if (computed) {
+      return name === undefined ? `[${value}]` : `[${name}]`;
+    }
+    return name;
+  }
+
+  if (computed || array) {
+    if (prevComputed || prevArray) {
+      return `[${name}]${expression}`;
+    }
+    return `[${name === undefined ? value : name}].${expression}`;
+  }
+
+  if (prevComputed || prevArray) {
+    return `${name}${expression}`;
+  }
+
+  if (isComputedExpression(expression) && name !== undefined) {
+    return `${name}${expression}`;
+  }
+
+  if (optional) {
+    return `${name}?.${expression}`;
+  }
+
+  return `${name}.${expression}`;
+}
+
+function getMemberSnippet(node, expression = "", optional = false) {
+  if (t.isMemberExpression(node) || t.isOptionalMemberExpression(node)) {
+    const name = t.isPrivateName(node.property)
+      ? `#${node.property.id.name}`
+      : node.property.name;
+    const snippet = getMemberSnippet(
+      node.object,
+      extendSnippet(name, expression, { node }),
+      node.optional
+    );
+    return snippet;
+  }
+
+  if (t.isCallExpression(node)) {
+    return "";
+  }
+
+  if (t.isThisExpression(node)) {
+    return `this.${expression}`;
+  }
+
+  if (t.isIdentifier(node)) {
+    if (isComputedExpression(expression)) {
+      return `${node.name}${expression}`;
+    }
+    if (optional) {
+      return `${node.name}?.${expression}`;
+    }
+    return `${node.name}.${expression}`;
+  }
+
+  return expression;
+}
+
+function getObjectSnippet(path, prevPath, expression = "") {
+  if (!path) {
+    return expression;
+  }
+
+  const { name } = path.node.key;
+
+  const extendedExpression = extendSnippet(name, expression, path, prevPath);
+
+  const nextPrevPath = path;
+  const nextPath = path.parentPath && path.parentPath.parentPath;
+
+  return getSnippet(nextPath, nextPrevPath, extendedExpression);
+}
+
+function getArraySnippet(path, prevPath, expression) {
+  if (!prevPath.parentPath) {
+    throw new Error("Assertion failure - path should exist");
+  }
+
+  const index = `${prevPath.parentPath.containerIndex}`;
+  const extendedExpression = extendSnippet(index, expression, path, prevPath);
+
+  const nextPrevPath = path;
+  const nextPath = path.parentPath && path.parentPath.parentPath;
+
+  return getSnippet(nextPath, nextPrevPath, extendedExpression);
+}
+
+function getSnippet(path, prevPath, expression = "") {
+  if (!path) {
+    return expression;
+  }
+
+  if (t.isVariableDeclaration(path)) {
+    const node = path.node.declarations[0];
+    const { name } = node.id;
+    return extendSnippet(name, expression, path, prevPath);
+  }
+
+  if (t.isVariableDeclarator(path)) {
+    const node = path.node.id;
+    if (t.isObjectPattern(node)) {
+      return expression;
+    }
+
+    const prop = extendSnippet(node.name, expression, path, prevPath);
+    return prop;
+  }
+
+  if (t.isAssignmentExpression(path)) {
+    const node = path.node.left;
+    const name = t.isMemberExpression(node)
+      ? getMemberSnippet(node)
+      : node.name;
+
+    const prop = extendSnippet(name, expression, path, prevPath);
+    return prop;
+  }
+
+  if (isFunction(path)) {
+    return expression;
+  }
+
+  if (t.isIdentifier(path)) {
+    return `${path.node.name}.${expression}`;
+  }
+
+  if (t.isObjectProperty(path)) {
+    return getObjectSnippet(path, prevPath, expression);
+  }
+
+  if (t.isObjectExpression(path)) {
+    const parentPath = prevPath?.parentPath;
+    return getObjectSnippet(parentPath, prevPath, expression);
+  }
+
+  if (t.isMemberExpression(path) || t.isOptionalMemberExpression(path)) {
+    return getMemberSnippet(path.node, expression);
+  }
+
+  if (t.isArrayExpression(path)) {
+    if (!prevPath) {
+      throw new Error("Assertion failure - path should exist");
+    }
+
+    return getArraySnippet(path, prevPath, expression);
+  }
+
+  return "";
+}
+
+export function clearSymbols(sourceIds) {
+  for (const sourceId of sourceIds) {
+    symbolDeclarations.delete(sourceId);
+  }
+}
+
+export function getInternalSymbols(sourceId) {
+  if (symbolDeclarations.has(sourceId)) {
+    const symbols = symbolDeclarations.get(sourceId);
+    if (symbols) {
+      return symbols;
+    }
+  }
+
+  const symbols = extractSymbols(sourceId);
+
+  symbolDeclarations.set(sourceId, symbols);
+  return symbols;
+}
+
+export function getFunctionSymbols(sourceId, maxResults) {
+  const symbols = getInternalSymbols(sourceId);
+  if (!symbols) {
+    return [];
+  }
+  let { functions } = symbols;
+  // Avoid transferring more symbols than necessary
+  if (maxResults && functions.length > maxResults) {
+    functions = functions.slice(0, maxResults);
+  }
+  // The Outline & the Quick open panels do not need anonymous functions
+  return functions.filter(fn => fn.name !== "anonymous");
+}
+
+export function getClassSymbols(sourceId) {
+  const symbols = getInternalSymbols(sourceId);
+  if (!symbols) {
+    return [];
+  }
+
+  return symbols.classes;
+}
+
+function containsPosition(a, b) {
+  const bColumn = b.column || 0;
+  const startsBefore =
+    a.start.line < b.line ||
+    (a.start.line === b.line && a.start.column <= bColumn);
+  const endsAfter =
+    a.end.line > b.line || (a.end.line === b.line && a.end.column >= bColumn);
+
+  return startsBefore && endsAfter;
+}
+
+export function getClosestFunctionName(location) {
+  const symbols = getInternalSymbols(location.source.id);
+  if (!symbols || !symbols.functions) {
+    return "";
+  }
+
+  const closestFunction = symbols.functions.reduce((found, currNode) => {
+    if (
+      currNode.name === "anonymous" ||
+      !containsPosition(currNode.location, {
+        line: location.line,
+        column: location.column || 0,
+      })
+    ) {
+      return found;
+    }
+
+    if (!found) {
+      return currNode;
+    }
+
+    if (found.location.start.line > currNode.location.start.line) {
+      return found;
+    }
+    if (
+      found.location.start.line === currNode.location.start.line &&
+      found.location.start.column > currNode.location.start.column
+    ) {
+      return found;
+    }
+
+    return currNode;
+  }, null);
+
+  if (!closestFunction) {
+    return "";
+  }
+  return closestFunction.name;
+}
+
+// This is only called from the main thread and we return a subset of attributes
+export function getSymbols(sourceId) {
+  const symbols = getInternalSymbols(sourceId);
+  return {
+    // This is used in the main thread by:
+    // * The `getFunctionSymbols` function which is used by the Outline, QuickOpen panels.
+    // * The `getClosestFunctionName` function used in the mapping of frame function names.
+    // * The `findOutOfScopeLocations` function use to determine in scope lines.
+    // functions: symbols.functions,
+
+    // The three following attributes are only used by `findBestMatchExpression` within the worker thread
+    // `memberExpressions`, `literals`
+    // This one is also used within the worker for framework computation
+    // `identifiers`
+    //
+    // These three memberExpressions, literals and identifiers attributes are arrays containing objects whose attributes are:
+    // * name: string
+    // * location: object {start: number, end: number}
+    // * expression: string
+    // * computed: boolean (only for memberExpressions)
+    //
+    // `findBestMatchExpression` uses `location`, `computed` and `expression` (not name).
+    //    `expression` isn't used from the worker thread implementation of `findBestMatchExpression`.
+    //    The main thread only uses `expression` and `location`.
+    // framework computation uses only:
+    // * `name` for identifiers
+    // * `expression` for memberExpression
+
+    // This is used within the worker for framework computation,
+    // and in the `getClassSymbols` function
+    // `classes`
+
+    // The two following are only used by the main thread for computing CodeMirror "mode"
+    hasJsx: symbols.hasJsx,
+    hasTypes: symbols.hasTypes,
+
+    // This is used in the main thread only to compute the source icon
+    framework: symbols.framework,
+
+    // This is only used by `findOutOfScopeLocations`:
+    // `comments`
+  };
+}
+
+function getMemberExpressionSymbol(path) {
+  const { start, end } = path.node.property.loc;
+  return {
+    location: { start, end },
+    get expression() {
+      delete this.expression;
+      this.expression = getSnippet(path);
+      return this.expression;
+    },
+    computed: path.node.computed,
+  };
+}
+
+function isReactImport(node) {
+  return (
+    node.source.value == "react" &&
+    node.specifiers?.some(specifier => specifier.local?.name == "React")
+  );
+}
+
+function isReactRequire(node) {
+  const { callee } = node;
+  const name = t.isMemberExpression(callee)
+    ? callee.property.name
+    : callee.loc.identifierName;
+  return name == "require" && node.arguments.some(arg => arg.value == "react");
+}
+
+function getClassParentName(superClass) {
+  return t.isMemberExpression(superClass)
+    ? getCode(superClass)
+    : superClass.name;
+}
+
+function getClassParentSymbol(superClass) {
+  if (!superClass) {
+    return null;
+  }
+  return {
+    name: getClassParentName(superClass),
+    location: superClass.loc,
+  };
+}
+
+function getClassDeclarationSymbol(node) {
+  const { loc, superClass } = node;
+  return {
+    name: node.id.name,
+    parent: getClassParentSymbol(superClass),
+    location: loc,
+  };
+}
+
+/**
+ * Get a list of identifiers that are part of the given path.
+ *
+ * @param {Array.<Object>} identifiers
+ *        the current list of identifiers where to push the new identifiers
+ *        related to this path.
+ * @param {Set<String>} identifiersKeys
+ *        List of currently registered identifier location key.
+ * @param {Object} path
+ */
+function getIdentifierSymbols(identifiers, identifiersKeys, path) {
+  if (t.isStringLiteral(path) && t.isProperty(path.parentPath)) {
+    if (!identifiersKeys.has(nodeLocationKey(path.node.loc))) {
+      identifiers.push({
+        name: path.node.value,
+        get expression() {
+          delete this.expression;
+          this.expression = getObjectExpressionValue(path.parent);
+          return this.expression;
+        },
+        location: path.node.loc,
+      });
+    }
+    return;
+  }
+
+  if (t.isIdentifier(path) && !t.isGenericTypeAnnotation(path.parent)) {
+    // We want to include function params, but exclude the function name
+    if (t.isClassMethod(path.parent) && !path.inList) {
+      return;
+    }
+
+    if (t.isProperty(path.parentPath) && !isObjectShorthand(path.parent)) {
+      if (!identifiersKeys.has(nodeLocationKey(path.node.loc))) {
+        identifiers.push({
+          name: path.node.name,
+          get expression() {
+            delete this.expression;
+            this.expression = getObjectExpressionValue(path.parent);
+            return this.expression;
+          },
+          location: path.node.loc,
+        });
+      }
+      return;
+    }
+
+    let { start, end } = path.node.loc;
+    if (path.node.typeAnnotation) {
+      const { column } = path.node.typeAnnotation.loc.start;
+      end = { ...end, column };
+    }
+
+    if (!identifiersKeys.has(nodeLocationKey({ start, end }))) {
+      identifiers.push({
+        name: path.node.name,
+        expression: path.node.name,
+        location: { start, end },
+      });
+    }
+  }
+
+  if (t.isThisExpression(path.node)) {
+    if (!identifiersKeys.has(nodeLocationKey(path.node.loc))) {
+      identifiers.push({
+        name: "this",
+        location: path.node.loc,
+        expression: "this",
+      });
+    }
+  }
+
+  if (t.isVariableDeclarator(path)) {
+    const nodeId = path.node.id;
+
+    addPatternIdentifiers(identifiers, identifiersKeys, nodeId);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/index.js b/devtools/client/debugger/src/workers/parser/index.js
new file mode 100644
index 0000000000..d60c3d32aa
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/index.js
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { WorkerDispatcher } from "devtools/client/shared/worker-utils";
+
+const WORKER_URL = "resource://devtools/client/debugger/dist/parser-worker.js";
+
+export class ParserDispatcher extends WorkerDispatcher {
+  constructor(jestUrl) {
+    super(jestUrl || WORKER_URL);
+  }
+
+  findOutOfScopeLocations = this.task("findOutOfScopeLocations");
+  findBestMatchExpression = this.task("findBestMatchExpression");
+
+  getScopes = this.task("getScopes");
+
+  getSymbols = this.task("getSymbols");
+  getFunctionSymbols = this.task("getFunctionSymbols");
+  getClassSymbols = this.task("getClassSymbols");
+  getClosestFunctionName = this.task("getClosestFunctionName");
+
+  async setSource(sourceId, content) {
+    const astSource = {
+      id: sourceId,
+      text: content.type === "wasm" ? "" : content.value,
+      contentType: content.contentType || null,
+      isWasm: content.type === "wasm",
+    };
+
+    return this.invoke("setSource", astSource);
+  }
+
+  mapExpression = this.task("mapExpression");
+
+  clearSources = this.task("clearSources");
+
+  /**
+   * Reports if the location's source can be parsed by this worker.
+   *
+   * @param {Object} location
+   *        A debugger frontend location object. See createLocation().
+   * @return {Boolean}
+   *         True, if the worker may be able to parse this source.
+   */
+  isLocationSupported(location) {
+    // There might be more sources that the worker doesn't support,
+    // like original sources which aren't JavaScript.
+    // But we can only know with the source's content type,
+    // which isn't available right away.
+    // These source will be ignored from within the worker.
+    return !location.source.isWasm;
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/mapAwaitExpression.js b/devtools/client/debugger/src/workers/parser/mapAwaitExpression.js
new file mode 100644
index 0000000000..ec29d6cf21
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/mapAwaitExpression.js
@@ -0,0 +1,208 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import generate from "@babel/generator";
+import * as t from "@babel/types";
+
+import { hasNode, replaceNode } from "./utils/ast";
+import { isTopLevel } from "./utils/helpers";
+
+function hasTopLevelAwait(ast) {
+  const hasAwait = hasNode(
+    ast,
+    (node, ancestors, b) => t.isAwaitExpression(node) && isTopLevel(ancestors)
+  );
+
+  return hasAwait;
+}
+
+// translates new bindings `var a = 3` into `a = 3`.
+function translateDeclarationIntoAssignment(node) {
+  return node.declarations.reduce((acc, declaration) => {
+    // Don't translate declaration without initial assignment (e.g. `var a;`)
+    if (!declaration.init) {
+      return acc;
+    }
+    acc.push(
+      t.expressionStatement(
+        t.assignmentExpression("=", declaration.id, declaration.init)
+      )
+    );
+    return acc;
+  }, []);
+}
+
+/**
+ * Given an AST, modify it to return the last evaluated statement's expression value if possible.
+ * This is to preserve existing console behavior of displaying the last executed expression value.
+ */
+function addReturnNode(ast) {
+  const statements = ast.program.body;
+  const lastStatement = statements.pop();
+
+  // if the last expression is an awaitExpression, strip the `await` part and directly
+  // return the argument to avoid calling the argument's `then` function twice when the
+  // mapped expression gets evaluated (See Bug 1771428)
+  if (t.isAwaitExpression(lastStatement.expression)) {
+    lastStatement.expression = lastStatement.expression.argument;
+  }
+
+  // NOTE: For more complicated cases such as an if/for statement, the last evaluated
+  // expression value probably can not be displayed, unless doing hacky workarounds such
+  // as returning the `eval` of the final statement (won't always work due to CSP issues?)
+  // or SpiderMonkey support (See Bug 1839588) at which point this entire module can be removed.
+  statements.push(
+    t.isExpressionStatement(lastStatement)
+      ? t.returnStatement(lastStatement.expression)
+      : lastStatement
+  );
+  return statements;
+}
+
+function getDeclarations(node) {
+  const { kind, declarations } = node;
+  const declaratorNodes = declarations.reduce((acc, d) => {
+    const declarators = getVariableDeclarators(d.id);
+    return acc.concat(declarators);
+  }, []);
+
+  // We can't declare const variables outside of the async iife because we
+  // wouldn't be able to re-assign them. As a workaround, we transform them
+  // to `let` which should be good enough for those case.
+  return t.variableDeclaration(
+    kind === "const" ? "let" : kind,
+    declaratorNodes
+  );
+}
+
+function getVariableDeclarators(node) {
+  if (t.isIdentifier(node)) {
+    return t.variableDeclarator(t.identifier(node.name));
+  }
+
+  if (t.isObjectProperty(node)) {
+    return getVariableDeclarators(node.value);
+  }
+  if (t.isRestElement(node)) {
+    return getVariableDeclarators(node.argument);
+  }
+
+  if (t.isAssignmentPattern(node)) {
+    return getVariableDeclarators(node.left);
+  }
+
+  if (t.isArrayPattern(node)) {
+    return node.elements.reduce(
+      (acc, element) => acc.concat(getVariableDeclarators(element)),
+      []
+    );
+  }
+  if (t.isObjectPattern(node)) {
+    return node.properties.reduce(
+      (acc, property) => acc.concat(getVariableDeclarators(property)),
+      []
+    );
+  }
+  return [];
+}
+
+/**
+ * Given an AST and an array of variableDeclaration nodes, return a new AST with
+ * all the declarations at the top of the AST.
+ */
+function addTopDeclarationNodes(ast, declarationNodes) {
+  const statements = [];
+  declarationNodes.forEach(declarationNode => {
+    statements.push(getDeclarations(declarationNode));
+  });
+  statements.push(ast);
+  return t.program(statements);
+}
+
+/**
+ * Given an AST, return an object of the following shape:
+ *   - newAst: {AST} the AST where variable declarations were transformed into
+ *             variable assignments
+ *   - declarations: {Array<Node>} An array of all the declaration nodes needed
+ *                   outside of the async iife.
+ */
+function translateDeclarationsIntoAssignment(ast) {
+  const declarations = [];
+  t.traverse(ast, (node, ancestors) => {
+    const parent = ancestors[ancestors.length - 1];
+
+    if (
+      t.isWithStatement(node) ||
+      !isTopLevel(ancestors) ||
+      t.isAssignmentExpression(node) ||
+      !t.isVariableDeclaration(node) ||
+      t.isForStatement(parent.node) ||
+      t.isForXStatement(parent.node) ||
+      !Array.isArray(node.declarations) ||
+      node.declarations.length === 0
+    ) {
+      return;
+    }
+
+    const newNodes = translateDeclarationIntoAssignment(node);
+    replaceNode(ancestors, newNodes);
+    declarations.push(node);
+  });
+
+  return {
+    newAst: ast,
+    declarations,
+  };
+}
+
+/**
+ * Given an AST, wrap its body in an async iife, transform variable declarations
+ * in assignments and move the variable declarations outside of the async iife.
+ * Example: With the AST for the following expression: `let a = await 123`, the
+ * function will return:
+ * let a;
+ * (async => {
+ *   return a = await 123;
+ * })();
+ */
+function wrapExpressionFromAst(ast) {
+  // Transform let and var declarations into assignments, and get back an array
+  // of variable declarations.
+  let { newAst, declarations } = translateDeclarationsIntoAssignment(ast);
+  const body = addReturnNode(newAst);
+
+  // Create the async iife.
+  newAst = t.expressionStatement(
+    t.callExpression(
+      t.arrowFunctionExpression([], t.blockStatement(body), true),
+      []
+    )
+  );
+
+  // Now let's put all the variable declarations at the top of the async iife.
+  newAst = addTopDeclarationNodes(newAst, declarations);
+
+  return generate(newAst).code;
+}
+
+export default function mapTopLevelAwait(expression, ast) {
+  if (!ast) {
+    // If there's no ast this means the expression is malformed. And if the
+    // expression contains the await keyword, we still want to wrap it in an
+    // async iife in order to get a meaningful message (without this, the
+    // engine will throw an Error stating that await keywords are only valid
+    // in async functions and generators).
+    if (expression.includes("await ")) {
+      return `(async () => { ${expression} })();`;
+    }
+
+    return expression;
+  }
+
+  if (!hasTopLevelAwait(ast)) {
+    return expression;
+  }
+
+  return wrapExpressionFromAst(ast);
+}
diff --git a/devtools/client/debugger/src/workers/parser/mapBindings.js b/devtools/client/debugger/src/workers/parser/mapBindings.js
new file mode 100644
index 0000000000..f8260787f1
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/mapBindings.js
@@ -0,0 +1,120 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { replaceNode } from "./utils/ast";
+import { isTopLevel } from "./utils/helpers";
+
+import generate from "@babel/generator";
+import * as t from "@babel/types";
+
+function getAssignmentTarget(node, bindings) {
+  if (t.isObjectPattern(node)) {
+    for (const property of node.properties) {
+      if (t.isRestElement(property)) {
+        property.argument = getAssignmentTarget(property.argument, bindings);
+      } else {
+        property.value = getAssignmentTarget(property.value, bindings);
+      }
+    }
+
+    return node;
+  }
+
+  if (t.isArrayPattern(node)) {
+    for (const [i, element] of node.elements.entries()) {
+      node.elements[i] = getAssignmentTarget(element, bindings);
+    }
+
+    return node;
+  }
+
+  if (t.isAssignmentPattern(node)) {
+    node.left = getAssignmentTarget(node.left, bindings);
+
+    return node;
+  }
+
+  if (t.isRestElement(node)) {
+    node.argument = getAssignmentTarget(node.argument, bindings);
+
+    return node;
+  }
+
+  if (t.isIdentifier(node)) {
+    return bindings.includes(node.name)
+      ? node
+      : t.memberExpression(t.identifier("self"), node);
+  }
+
+  return node;
+}
+
+// translates new bindings `var a = 3` into `self.a = 3`
+// and existing bindings `var a = 3` into `a = 3` for re-assignments
+function globalizeDeclaration(node, bindings) {
+  return node.declarations.map(declaration =>
+    t.expressionStatement(
+      t.assignmentExpression(
+        "=",
+        getAssignmentTarget(declaration.id, bindings),
+        declaration.init || t.unaryExpression("void", t.numericLiteral(0))
+      )
+    )
+  );
+}
+
+// translates new bindings `a = 3` into `self.a = 3`
+// and keeps assignments the same for existing bindings.
+function globalizeAssignment(node, bindings) {
+  return t.assignmentExpression(
+    node.operator,
+    getAssignmentTarget(node.left, bindings),
+    node.right
+  );
+}
+
+export default function mapExpressionBindings(expression, ast, bindings = []) {
+  let isMapped = false;
+  let shouldUpdate = true;
+
+  t.traverse(ast, (node, ancestors) => {
+    const parent = ancestors[ancestors.length - 1];
+
+    if (t.isWithStatement(node)) {
+      shouldUpdate = false;
+      return;
+    }
+
+    if (!isTopLevel(ancestors)) {
+      return;
+    }
+
+    if (t.isAssignmentExpression(node)) {
+      if (t.isIdentifier(node.left) || t.isPattern(node.left)) {
+        const newNode = globalizeAssignment(node, bindings);
+        isMapped = true;
+        replaceNode(ancestors, newNode);
+        return;
+      }
+
+      return;
+    }
+
+    if (!t.isVariableDeclaration(node)) {
+      return;
+    }
+
+    if (!t.isForStatement(parent.node)) {
+      const newNodes = globalizeDeclaration(node, bindings);
+      isMapped = true;
+      replaceNode(ancestors, newNodes);
+    }
+  });
+
+  if (!shouldUpdate || !isMapped) {
+    return expression;
+  }
+
+  return generate(ast).code;
+}
diff --git a/devtools/client/debugger/src/workers/parser/mapExpression.js b/devtools/client/debugger/src/workers/parser/mapExpression.js
new file mode 100644
index 0000000000..71f3b016fc
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/mapExpression.js
@@ -0,0 +1,50 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { parseConsoleScript } from "./utils/ast";
+import mapOriginalExpression from "./mapOriginalExpression";
+import mapExpressionBindings from "./mapBindings";
+import mapTopLevelAwait from "./mapAwaitExpression";
+
+export default function mapExpression(
+  expression,
+  mappings,
+  bindings,
+  shouldMapBindings = true,
+  shouldMapAwait = true
+) {
+  const mapped = {
+    await: false,
+    bindings: false,
+    originalExpression: false,
+  };
+
+  const ast = parseConsoleScript(expression);
+  try {
+    if (mappings && ast) {
+      const beforeOriginalExpression = expression;
+      expression = mapOriginalExpression(expression, ast, mappings);
+      mapped.originalExpression = beforeOriginalExpression !== expression;
+    }
+
+    if (shouldMapBindings && ast) {
+      const beforeBindings = expression;
+      expression = mapExpressionBindings(expression, ast, bindings);
+      mapped.bindings = beforeBindings !== expression;
+    }
+
+    if (shouldMapAwait) {
+      const beforeAwait = expression;
+      expression = mapTopLevelAwait(expression, ast);
+      mapped.await = beforeAwait !== expression;
+    }
+  } catch (e) {
+    console.warn(`Error when mapping ${expression} expression:`, e);
+  }
+
+  return {
+    expression,
+    mapped,
+  };
+}
diff --git a/devtools/client/debugger/src/workers/parser/mapOriginalExpression.js b/devtools/client/debugger/src/workers/parser/mapOriginalExpression.js
new file mode 100644
index 0000000000..1724db9838
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/mapOriginalExpression.js
@@ -0,0 +1,106 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { parseScript } from "./utils/ast";
+import { buildScopeList } from "./getScopes";
+import generate from "@babel/generator";
+import * as t from "@babel/types";
+
+// NOTE: this will only work if we are replacing an original identifier
+function replaceNode(ancestors, node) {
+  const ancestor = ancestors[ancestors.length - 1];
+
+  if (typeof ancestor.index === "number") {
+    ancestor.node[ancestor.key][ancestor.index] = node;
+  } else {
+    ancestor.node[ancestor.key] = node;
+  }
+}
+
+function getFirstExpression(ast) {
+  const statements = ast.program.body;
+  if (!statements.length) {
+    return null;
+  }
+
+  return statements[0].expression;
+}
+
+function locationKey(start) {
+  return `${start.line}:${start.column}`;
+}
+
+export default function mapOriginalExpression(expression, ast, mappings) {
+  const scopes = buildScopeList(ast, "");
+  let shouldUpdate = false;
+
+  const nodes = new Map();
+  const replacements = new Map();
+
+  // The ref-only global bindings are the ones that are accessed, but not
+  // declared anywhere in the parsed code, meaning they are either global,
+  // or declared somewhere in a scope outside the parsed code, so we
+  // rewrite all of those specifically to avoid rewritting declarations that
+  // shadow outer mappings.
+  for (const name of Object.keys(scopes[0].bindings)) {
+    const { refs } = scopes[0].bindings[name];
+    const mapping = mappings[name];
+
+    if (
+      !refs.every(ref => ref.type === "ref") ||
+      !mapping ||
+      mapping === name
+    ) {
+      continue;
+    }
+
+    let node = nodes.get(name);
+    if (!node) {
+      node = getFirstExpression(parseScript(mapping));
+      nodes.set(name, node);
+    }
+
+    for (const ref of refs) {
+      let { line, column } = ref.start;
+
+      // This shouldn't happen, just keeping Flow happy.
+      if (typeof column !== "number") {
+        column = 0;
+      }
+
+      replacements.set(locationKey({ line, column }), node);
+    }
+  }
+
+  if (replacements.size === 0) {
+    // Avoid the extra code generation work and also avoid potentially
+    // reformatting the user's code unnecessarily.
+    return expression;
+  }
+
+  t.traverse(ast, (node, ancestors) => {
+    if (!t.isIdentifier(node) && !t.isThisExpression(node)) {
+      return;
+    }
+
+    const ancestor = ancestors[ancestors.length - 1];
+    // Shorthand properties can have a key and value with `node.loc.start` value
+    // and we only want to replace the value.
+    if (t.isObjectProperty(ancestor.node) && ancestor.key !== "value") {
+      return;
+    }
+
+    const replacement = replacements.get(locationKey(node.loc.start));
+    if (replacement) {
+      replaceNode(ancestors, t.cloneNode(replacement));
+      shouldUpdate = true;
+    }
+  });
+
+  if (shouldUpdate) {
+    return generate(ast).code;
+  }
+
+  return expression;
+}
diff --git a/devtools/client/debugger/src/workers/parser/moz.build b/devtools/client/debugger/src/workers/parser/moz.build
new file mode 100644
index 0000000000..b7223ac81a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/moz.build
@@ -0,0 +1,10 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += []
+
+CompiledModules(
+    "index.js",
+)
diff --git a/devtools/client/debugger/src/workers/parser/sources.js b/devtools/client/debugger/src/workers/parser/sources.js
new file mode 100644
index 0000000000..24d358c566
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/sources.js
@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+const cachedSources = new Map();
+
+export function setSource(source) {
+  cachedSources.set(source.id, source);
+}
+
+export function getSource(sourceId) {
+  const source = cachedSources.get(sourceId);
+  if (!source) {
+    throw new Error(`Parser: source ${sourceId} was not provided.`);
+  }
+
+  return source;
+}
+
+export function clearSources(sourceIds) {
+  for (const sourceId of sourceIds) {
+    cachedSources.delete(sourceId);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/__snapshots__/findOutOfScopeLocations.spec.js.snap b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/findOutOfScopeLocations.spec.js.snap
new file mode 100644
index 0000000000..4689f0c824
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/findOutOfScopeLocations.spec.js.snap
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Parser.findOutOfScopeLocations should exclude function for locations on declaration 1`] = `
+"(1, 0) -> (1, 16)
+(3, 14) -> (27, 1)
+(29, 16) -> (33, 1)
+(35, 20) -> (37, 1)
+(39, 26) -> (41, 1)
+(43, 20) -> (45, 1)
+(47, 31) -> (49, 1)
+(51, 19) -> (62, 1)"
+`;
+
+exports[`Parser.findOutOfScopeLocations should exclude non-enclosing function blocks 1`] = `
+"(1, 0) -> (1, 16)
+(8, 16) -> (10, 3)
+(12, 22) -> (14, 3)
+(16, 16) -> (18, 3)
+(20, 27) -> (22, 3)
+(24, 9) -> (26, 3)
+(29, 16) -> (33, 1)
+(35, 20) -> (37, 1)
+(39, 26) -> (41, 1)
+(43, 20) -> (45, 1)
+(47, 31) -> (49, 1)
+(51, 19) -> (62, 1)"
+`;
+
+exports[`Parser.findOutOfScopeLocations should not exclude in-scope inner locations 1`] = `
+"(1, 0) -> (1, 16)
+(3, 14) -> (27, 1)
+(29, 16) -> (33, 1)
+(35, 20) -> (37, 1)
+(39, 26) -> (41, 1)
+(43, 20) -> (45, 1)
+(47, 31) -> (49, 1)"
+`;
+
+exports[`Parser.findOutOfScopeLocations should roll up function blocks 1`] = `
+"(1, 0) -> (1, 16)
+(29, 16) -> (33, 1)
+(35, 20) -> (37, 1)
+(39, 26) -> (41, 1)
+(43, 20) -> (45, 1)
+(47, 31) -> (49, 1)
+(51, 19) -> (62, 1)"
+`;
diff --git a/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getScopes.spec.js.snap b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getScopes.spec.js.snap
new file mode 100644
index 0000000000..b579b89587
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getScopes.spec.js.snap
@@ -0,0 +1,18895 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Parser.getScopes finds scope bindings and exclude Flowtype: getScopes finds scope bindings and exclude Flowtype at line 8 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 7,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 9,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 9,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings and exclude Flowtype: getScopes finds scope bindings and exclude Flowtype at line 10 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 9,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 7,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/flowtype-bindings/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 9,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 9,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 7,
+              "sourceId": "scopes/flowtype-bindings/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/flowtype-bindings/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for arrow functions: getScopes finds scope bindings for arrow functions at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 18,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for arrow functions: getScopes finds scope bindings for arrow functions at line 4 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "p1": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "outer",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 13,
+      "line": 3,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 18,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for arrow functions: getScopes finds scope bindings for arrow functions at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 9,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "anonymous",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 3,
+      "line": 6,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "p1": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "outer",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 13,
+      "line": 3,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 18,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for arrow functions: getScopes finds scope bindings for arrow functions at line 8 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "p2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 9,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 16,
+                "line": 7,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 19,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 17,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "inner",
+    "end": Object {
+      "column": 5,
+      "line": 9,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 17,
+      "line": 7,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 9,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "anonymous",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 3,
+      "line": 6,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "p1": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "outer",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 13,
+      "line": 3,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 18,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 4,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 8,
+                "sourceId": "scopes/arrow-function/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/arrow-function/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/arrow-function/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for block statements: getScopes finds scope bindings for block statements at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "first": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 3,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 6,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 6,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seventh": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 13,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 13,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for block statements: getScopes finds scope bindings for block statements at line 6 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Fourth": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 17,
+                "line": 8,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 8,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 8,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 8,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "fifth": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 9,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 9,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 9,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "sixth": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 10,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 10,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 10,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "third": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 7,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 16,
+              "line": 7,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 5,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "first": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 3,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 6,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 6,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seventh": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 13,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/block-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 13,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/block-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/block-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class declarations: getScopes finds scope bindings for class declarations at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "Second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 15,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "decorator": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class declarations: getScopes finds scope bindings for class declarations at line 5 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 9,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 11,
+      "line": 4,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 4,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "Second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 15,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "decorator": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class declarations: getScopes finds scope bindings for class declarations at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 24,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 20,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "m",
+    "end": Object {
+      "column": 7,
+      "line": 8,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 6,
+      "line": 6,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 9,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 5,
+      "line": 9,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 4,
+      "line": 5,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 9,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 5,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 11,
+      "line": 4,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 4,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "Second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 15,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 14,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "decorator": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 13,
+              "sourceId": "scopes/class-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class expressions: getScopes finds scope bindings for class expressions at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class expressions: getScopes finds scope bindings for class expressions at line 5 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 9,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 5,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 4,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 23,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 12,
+      "line": 3,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class expressions: getScopes finds scope bindings for class expressions at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 24,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 20,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "m",
+    "end": Object {
+      "column": 7,
+      "line": 8,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 6,
+      "line": 6,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 9,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 5,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 4,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 23,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 12,
+      "line": 3,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 19,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 8,
+                "line": 7,
+                "sourceId": "scopes/class-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class properties: getScopes finds scope bindings for class properties at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class properties: getScopes finds scope bindings for class properties at line 4 column 16 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 4,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 18,
+                "line": 4,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "parent": Object {
+                "end": Object {
+                  "column": 20,
+                  "line": 4,
+                  "sourceId": "scopes/class-property/originalSource-1",
+                },
+                "parent": null,
+                "start": Object {
+                  "column": 9,
+                  "line": 4,
+                  "sourceId": "scopes/class-property/originalSource-1",
+                },
+                "type": "call",
+              },
+              "property": "init",
+              "start": Object {
+                "column": 9,
+                "line": 4,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Class Field",
+    "end": Object {
+      "column": 20,
+      "line": 4,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 9,
+      "line": 4,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 10,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class properties: getScopes finds scope bindings for class properties at line 6 column 12 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Class Field",
+    "end": Object {
+      "column": 3,
+      "line": 9,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 10,
+      "line": 6,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 10,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for class properties: getScopes finds scope bindings for class properties at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 8,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 8,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 8,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 8,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 3,
+      "line": 9,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 13,
+      "line": 6,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Class Field",
+    "end": Object {
+      "column": 3,
+      "line": 9,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 10,
+      "line": 6,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 10,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 10,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/class-property/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/class-property/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 11,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/class-property/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for complex binding nesting: getScopes finds scope bindings for complex binding nesting at line 16 column 4 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "_arguments": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 31,
+                "line": 13,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 12,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 35,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "_this": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 31,
+                "line": 13,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 12,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 23,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "arg": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 23,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 30,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 21,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 31,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 22,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "arrow": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 21,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 18,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 22,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 20,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 20,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 3,
+      "line": 23,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 11,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 23,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 32,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 30,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 34,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 32,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 4,
+              "line": 25,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 9,
+                "line": 25,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "call",
+              "start": Object {
+                "column": 2,
+                "line": 25,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 25,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 26,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "__webpack_require__": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 51,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 32,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "exports": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 30,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 23,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+          Object {
+            "end": Object {
+              "column": 29,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 22,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "default",
+              "start": Object {
+                "column": 0,
+                "line": 9,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 24,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 35,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "default",
+              "start": Object {
+                "column": 17,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 17,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "module": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 15,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 14,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "exports",
+              "start": Object {
+                "column": 0,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 26,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 10,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 38,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 34,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 40,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 36,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "named",
+    "end": Object {
+      "column": 1,
+      "line": 29,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 30,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Object": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 21,
+                "line": 6,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "defineProperty",
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 15,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 15,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 16,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 16,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 19,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 19,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 20,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 20,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 30,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for complex binding nesting: getScopes finds scope bindings for complex binding nesting at line 20 column 6 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "argArrow": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 21,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 16,
+                "line": 18,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 39,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 31,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "arrow",
+    "end": Object {
+      "column": 5,
+      "line": 21,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 31,
+      "line": 18,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arrow": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 5,
+                "line": 21,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 16,
+                "line": 18,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 30,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 25,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-expr",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Function Expression",
+    "end": Object {
+      "column": 5,
+      "line": 21,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 16,
+      "line": 18,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "_arguments": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 31,
+                "line": 13,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 12,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 35,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "_this": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 31,
+                "line": 13,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 12,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 23,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "arg": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 23,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 30,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 21,
+              "line": 13,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 31,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 22,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "arrow": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 6,
+                "line": 21,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 18,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 18,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 22,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 20,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 12,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 20,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 3,
+      "line": 23,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 11,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 23,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 11,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 32,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 30,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 34,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 32,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 4,
+              "line": 25,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 9,
+                "line": 25,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "call",
+              "start": Object {
+                "column": 2,
+                "line": 25,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 25,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 26,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "__webpack_require__": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 51,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 32,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "exports": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 30,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 23,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+          Object {
+            "end": Object {
+              "column": 29,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 22,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "default",
+              "start": Object {
+                "column": 0,
+                "line": 9,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 24,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 35,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "default",
+              "start": Object {
+                "column": 17,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 17,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "module": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 15,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 14,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "exports",
+              "start": Object {
+                "column": 0,
+                "line": 27,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 27,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 26,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 10,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 22,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 18,
+              "line": 9,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 38,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 34,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 40,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 36,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "named",
+    "end": Object {
+      "column": 1,
+      "line": 29,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 30,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Object": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 21,
+                "line": 6,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "defineProperty",
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 6,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 15,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 15,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 15,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 16,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 16,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 16,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 19,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 19,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 19,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 13,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 17,
+                "line": 20,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 6,
+                "line": 20,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 20,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 29,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/complex-nesting/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/complex-nesting/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 30,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/complex-nesting/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for declarations with patterns: getScopes finds scope bindings for declarations with patterns at line 1 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/pattern-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/pattern-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 23,
+                "line": 1,
+                "sourceId": "scopes/pattern-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/pattern-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 1,
+              "sourceId": "scopes/pattern-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 12,
+              "line": 1,
+              "sourceId": "scopes/pattern-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 17,
+                "line": 2,
+                "sourceId": "scopes/pattern-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 2,
+                "sourceId": "scopes/pattern-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 2,
+              "sourceId": "scopes/pattern-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 2,
+              "sourceId": "scopes/pattern-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/pattern-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/pattern-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 3 column 17 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 4 column 17 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 4,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 4,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 4,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 18,
+      "line": 4,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 4,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 5 column 25 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "three": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 20,
+                "line": 5,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 5,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 16,
+              "line": 5,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 5,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 26,
+      "line": 5,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 5,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 7 column 22 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 8 column 22 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "five": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 8,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 8,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 8,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 23,
+      "line": 8,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 8,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 9 column 23 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "six": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 9,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 9,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 9,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 24,
+      "line": 9,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 9,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 11 column 23 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 12 column 23 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "eight": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 12,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 12,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 12,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 12,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 24,
+      "line": 12,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 12,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for for loops: getScopes finds scope bindings for for loops at line 13 column 24 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "nine": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 15,
+                "line": 13,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 13,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 13,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 13,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "For",
+    "end": Object {
+      "column": 25,
+      "line": 13,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 5,
+      "line": 13,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "four": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 7,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 3,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "seven": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+              "start": Object {
+                "column": 5,
+                "line": 11,
+                "sourceId": "scopes/for-loops/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 11,
+              "sourceId": "scopes/for-loops/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 14,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/for-loops/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function declarations: getScopes finds scope bindings for function declarations at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function declarations: getScopes finds scope bindings for function declarations at line 3 column 20 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "p1": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 15,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "outer",
+    "end": Object {
+      "column": 21,
+      "line": 3,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 3,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function declarations: getScopes finds scope bindings for function declarations at line 5 column 1 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "middle": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 10,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 5,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function declarations: getScopes finds scope bindings for function declarations at line 9 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 7,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 7,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 7,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "p2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 10,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 20,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 18,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 20,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "middle",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 18,
+      "line": 6,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "middle": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 10,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 5,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "outer": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/function-declaration/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 9,
+              "sourceId": "scopes/function-declaration/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-declaration/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function expressions: getScopes finds scope bindings for function expressions at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 5,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function expressions: getScopes finds scope bindings for function expressions at line 3 column 23 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "p1": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 24,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 9,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 20,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 24,
+      "line": 3,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 18,
+      "line": 3,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 5,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for function expressions: getScopes finds scope bindings for function expressions at line 6 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "p2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 7,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 10,
+                "line": 5,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 30,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 28,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 18,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "withName",
+    "end": Object {
+      "column": 1,
+      "line": 7,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 28,
+      "line": 5,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "withName": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 7,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 10,
+                "line": 5,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 27,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 19,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "fn-expr",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Function Expression",
+    "end": Object {
+      "column": 1,
+      "line": 7,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 10,
+      "line": 5,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 3,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 5,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 5,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 13,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/function-expression/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 6,
+              "sourceId": "scopes/function-expression/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 8,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/function-expression/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for out of order declarations: getScopes finds scope bindings for out of order declarations at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "aDefault": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 33,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 3,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 39,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 35,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 8,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for out of order declarations: getScopes finds scope bindings for out of order declarations at line 5 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "callback": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 16,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 10,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 19,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 33,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 12,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "start": Object {
+                "column": 2,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "call",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 3,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "aDefault": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 33,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 3,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 39,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 35,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 8,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for out of order declarations: getScopes finds scope bindings for out of order declarations at line 11 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 15,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 15,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 15,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 15,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 23,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 21,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 45,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 41,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 13,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 13,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 13,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "callback",
+    "end": Object {
+      "column": 3,
+      "line": 16,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 10,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "callback": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 16,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 10,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 19,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 33,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 12,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "start": Object {
+                "column": 2,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "call",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 3,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "aDefault": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 33,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 3,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 39,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 35,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 8,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for out of order declarations: getScopes finds scope bindings for out of order declarations at line 14 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 15,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 15,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 15,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 15,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 23,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 21,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 45,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 41,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 13,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 13,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 13,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 16,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "callback",
+    "end": Object {
+      "column": 3,
+      "line": 16,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 10,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "callback": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 16,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 10,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 19,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 33,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 12,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "start": Object {
+                "column": 2,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "call",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 3,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "aDefault": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 33,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 3,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 39,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 35,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 8,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for out of order declarations: getScopes finds scope bindings for out of order declarations at line 17 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "callback": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 16,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 10,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 19,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 10,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 33,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 25,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 12,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "start": Object {
+                "column": 2,
+                "line": 18,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "call",
+            },
+            "start": Object {
+              "column": 2,
+              "line": 18,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 6,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 8,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "root",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 3,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "aDefault": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 33,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 21,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 21,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "root": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 15,
+                "line": 3,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 24,
+              "line": 3,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 39,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 35,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "val": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 8,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 1,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 15,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/out-of-order-declarations/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 5 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 13,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 13,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 9 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 13,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 11 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "three": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 14,
+                "line": 11,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 11,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 11,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 11,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 3,
+      "line": 12,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 16,
+      "line": 10,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 7,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 7,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 9,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 9,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 13,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 3,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 17 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 20,
+                "line": 17,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 17,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 16,
+              "line": 17,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 13,
+              "line": 17,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 18,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 15,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for switch statements: getScopes finds scope bindings for switch statements at line 21 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "three": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 21,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 21,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 21,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 21,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Switch",
+    "end": Object {
+      "column": 1,
+      "line": 22,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 19,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "zero": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 5,
+                "sourceId": "scopes/switch-statement/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 3,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 8,
+              "line": 19,
+              "sourceId": "scopes/switch-statement/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 23,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/switch-statement/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for try..catch: getScopes finds scope bindings for try..catch at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "first": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "third": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for try..catch: getScopes finds scope bindings for try..catch at line 4 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "second": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 5,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 5,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 5,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 5,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 6,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 4,
+      "line": 3,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "first": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "third": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings for try..catch: getScopes finds scope bindings for try..catch at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "fourth": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 8,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 8,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 8,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 8,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 9,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 6,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "err": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 9,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 6,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 6,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "catch",
+          },
+        ],
+        "type": "var",
+      },
+    },
+    "displayName": "Catch",
+    "end": Object {
+      "column": 1,
+      "line": 9,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 6,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "first": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 4,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 4,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "third": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 7,
+                "sourceId": "scopes/try-catch/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/try-catch/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/try-catch/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a JSX element: getScopes finds scope bindings in a JSX element at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "SomeComponent": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 29,
+                "line": 1,
+                "sourceId": "scopes/jsx-component/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/jsx-component/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 20,
+              "line": 1,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 3,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 3,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 4,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 4,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 5,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 5,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 6,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 6,
+              "sourceId": "scopes/jsx-component/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "import",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/jsx-component/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a module: getScopes finds scope bindings in a module at line 7 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 9,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 9,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 9,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 9,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 1,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 1,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 15,
+              "line": 3,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 12,
+              "line": 3,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "import",
+      },
+      "one": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 5,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 5,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 5,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 5,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 4,
+              "line": 11,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 0,
+              "line": 11,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "three": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 7,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 7,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "two": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 12,
+                "line": 6,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 6,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 6,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "console": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 3,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 11,
+                "line": 3,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "parent": null,
+              "property": "log",
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/simple-module/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 3,
+              "sourceId": "scopes/simple-module/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 12,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/simple-module/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript file: getScopes finds scope bindings in a typescript file at line 9 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 21,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 15,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript file: getScopes finds scope bindings in a typescript file at line 13 column 4 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 14,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 12,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 24,
+              "line": 12,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 21,
+              "line": 12,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "constructor",
+    "end": Object {
+      "column": 3,
+      "line": 14,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 12,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 21,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 15,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript file: getScopes finds scope bindings in a typescript file at line 17 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 18,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 16,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 21,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 15,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript file: getScopes finds scope bindings in a typescript file at line 33 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 3,
+      "line": 34,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 32,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 34,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 32,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 32,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 32,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "TypeScript Namespace",
+    "end": Object {
+      "column": 1,
+      "line": 35,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 19,
+      "line": 31,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/ts-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 21,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 15,
+              "line": 22,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/ts-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/ts-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript-jsx file: getScopes finds scope bindings in a typescript-jsx file at line 9 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 28,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "any": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 11,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript-jsx file: getScopes finds scope bindings in a typescript-jsx file at line 13 column 4 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 14,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 12,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 24,
+              "line": 12,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 21,
+              "line": 12,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "fn-param",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "constructor",
+    "end": Object {
+      "column": 3,
+      "line": 14,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 12,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 28,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "any": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 11,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript-jsx file: getScopes finds scope bindings in a typescript-jsx file at line 17 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 18,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 16,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 19,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 10,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 28,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "any": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 11,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a typescript-jsx file: getScopes finds scope bindings in a typescript-jsx file at line 33 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 3,
+      "line": 34,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 32,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 3,
+                "line": 34,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 32,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 32,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 32,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "TypeScript Namespace",
+    "end": Object {
+      "column": 1,
+      "line": 35,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 19,
+      "line": 31,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Color": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 8,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 5,
+              "line": 3,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-enum-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "Example": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 19,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 10,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 10,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+          Object {
+            "end": Object {
+              "column": 16,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 9,
+              "line": 41,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "let",
+      },
+      "TheSpace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 35,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 31,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 31,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ts-namespace-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 28,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 22,
+                "sourceId": "scopes/tsx-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 7,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Error": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 14,
+              "line": 17,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "any": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 14,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 11,
+              "line": 22,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "window": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 25,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 1,
+              "line": 28,
+              "sourceId": "scopes/tsx-sample/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 42,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/tsx-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in a vue file: getScopes finds scope bindings in a vue file at line 14 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "fnVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 13,
+                "sourceId": "scopes/vue-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 4,
+                "line": 13,
+                "sourceId": "scopes/vue-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 13,
+              "sourceId": "scopes/vue-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/vue-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "data",
+    "end": Object {
+      "column": 3,
+      "line": 18,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 12,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "moduleVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 23,
+                "line": 8,
+                "sourceId": "scopes/vue-sample/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 8,
+                "sourceId": "scopes/vue-sample/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 8,
+              "sourceId": "scopes/vue-sample/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 8,
+              "sourceId": "scopes/vue-sample/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 1,
+      "line": 27,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 1,
+      "line": 27,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 1,
+      "line": 27,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/vue-sample/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in fn body with both lex and non-lex items: getScopes finds scope bindings in fn body with both lex and non-lex items at line 4 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "lex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 3,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 3,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 3,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 3,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 1,
+      "line": 5,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 14,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "nonlex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 2,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 2,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 2,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 2,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn",
+    "end": Object {
+      "column": 1,
+      "line": 5,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 5,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn3": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 17,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn4": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 23,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 19,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in fn body with both lex and non-lex items: getScopes finds scope bindings in fn body with both lex and non-lex items at line 10 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "lex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 10,
+                "line": 9,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 9,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 9,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 9,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 7,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "nonlex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 8,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 8,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 8,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 8,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn2",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 5,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn3": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 17,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn4": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 23,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 19,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in fn body with both lex and non-lex items: getScopes finds scope bindings in fn body with both lex and non-lex items at line 16 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Thing": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 15,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 15,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 15,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 15,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 1,
+      "line": 17,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 13,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "nonlex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 13,
+                "line": 14,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 14,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 14,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 14,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn3",
+    "end": Object {
+      "column": 1,
+      "line": 17,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 13,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 5,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn3": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 17,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn4": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 23,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 19,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings in fn body with both lex and non-lex items: getScopes finds scope bindings in fn body with both lex and non-lex items at line 22 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "Thing": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 21,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 21,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 13,
+              "line": 21,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 8,
+              "line": 21,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Function Body",
+    "end": Object {
+      "column": 1,
+      "line": 23,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 15,
+      "line": 19,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "nonlex": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 21,
+                "line": 20,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 20,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 17,
+              "line": 20,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 20,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "fn4",
+    "end": Object {
+      "column": 1,
+      "line": 23,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 19,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 5,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn2": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn3": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 17,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 13,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "fn4": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 23,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 19,
+                "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 19,
+              "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 24,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/fn-body-lex-and-nonlex/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings with expression metadata: getScopes finds scope bindings with expression metadata at line 2 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "foo": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 15,
+                "line": 1,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 1,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 1,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "const",
+          },
+          Object {
+            "end": Object {
+              "column": 3,
+              "line": 3,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 7,
+                "line": 3,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "parent": Object {
+                "end": Object {
+                  "column": 9,
+                  "line": 3,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "parent": Object {
+                  "end": Object {
+                    "column": 13,
+                    "line": 3,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "parent": null,
+                  "property": "baz",
+                  "start": Object {
+                    "column": 0,
+                    "line": 3,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "type": "member",
+                },
+                "start": Object {
+                  "column": 0,
+                  "line": 3,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "type": "call",
+              },
+              "property": "bar",
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 3,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 7,
+              "line": 4,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 11,
+                "line": 4,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "parent": Object {
+                "end": Object {
+                  "column": 12,
+                  "line": 4,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "parent": Object {
+                  "end": Object {
+                    "column": 14,
+                    "line": 4,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "parent": Object {
+                    "end": Object {
+                      "column": 18,
+                      "line": 4,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "parent": null,
+                    "property": "baz",
+                    "start": Object {
+                      "column": 0,
+                      "line": 4,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "type": "member",
+                  },
+                  "start": Object {
+                    "column": 0,
+                    "line": 4,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "type": "call",
+                },
+                "start": Object {
+                  "column": 0,
+                  "line": 4,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "type": "inherit",
+              },
+              "property": "bar",
+              "start": Object {
+                "column": 4,
+                "line": 4,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 4,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 10,
+              "line": 5,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 14,
+                "line": 5,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "parent": Object {
+                "end": Object {
+                  "column": 15,
+                  "line": 5,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "parent": Object {
+                  "end": Object {
+                    "column": 17,
+                    "line": 5,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "parent": Object {
+                    "end": Object {
+                      "column": 21,
+                      "line": 5,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "parent": null,
+                    "property": "baz",
+                    "start": Object {
+                      "column": 0,
+                      "line": 5,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "type": "member",
+                  },
+                  "start": Object {
+                    "column": 0,
+                    "line": 5,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "type": "call",
+                },
+                "start": Object {
+                  "column": 0,
+                  "line": 5,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "type": "inherit",
+              },
+              "property": "bar",
+              "start": Object {
+                "column": 7,
+                "line": 5,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 7,
+              "line": 5,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+          Object {
+            "end": Object {
+              "column": 25,
+              "line": 6,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 29,
+                "line": 6,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "parent": Object {
+                "end": Object {
+                  "column": 30,
+                  "line": 6,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "parent": Object {
+                  "end": Object {
+                    "column": 32,
+                    "line": 6,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "parent": Object {
+                    "end": Object {
+                      "column": 36,
+                      "line": 6,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "parent": null,
+                    "property": "baz",
+                    "start": Object {
+                      "column": 0,
+                      "line": 6,
+                      "sourceId": "scopes/expressions/originalSource-1",
+                    },
+                    "type": "member",
+                  },
+                  "start": Object {
+                    "column": 0,
+                    "line": 6,
+                    "sourceId": "scopes/expressions/originalSource-1",
+                  },
+                  "type": "call",
+                },
+                "start": Object {
+                  "column": 0,
+                  "line": 6,
+                  "sourceId": "scopes/expressions/originalSource-1",
+                },
+                "type": "inherit",
+              },
+              "property": "bar",
+              "start": Object {
+                "column": 22,
+                "line": 6,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 22,
+              "line": 6,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/expressions/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/expressions/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "Object": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 5,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 0,
+              "line": 5,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "__webpack_require__": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 19,
+              "line": 6,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "meta": Object {
+              "end": Object {
+                "column": 21,
+                "line": 6,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "parent": null,
+              "property": "i",
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/expressions/originalSource-1",
+              },
+              "type": "member",
+            },
+            "start": Object {
+              "column": 0,
+              "line": 6,
+              "sourceId": "scopes/expressions/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "global",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/expressions/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/expressions/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings with proper types: getScopes finds scope bindings with proper types at line 5 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "aLet": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "aVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "cls": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "def": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "named",
+            "start": Object {
+              "column": 9,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "namespace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 30,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 12,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-ns-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "otherNamed": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "thing",
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings with proper types: getScopes finds scope bindings with proper types at line 9 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "method",
+    "end": Object {
+      "column": 3,
+      "line": 10,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 2,
+      "line": 8,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "cls": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "class-inner",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Class",
+    "end": Object {
+      "column": 1,
+      "line": 11,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 7,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "aLet": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "aVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "cls": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "def": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "named",
+            "start": Object {
+              "column": 9,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "namespace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 30,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 12,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-ns-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "otherNamed": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "thing",
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings with proper types: getScopes finds scope bindings with proper types at line 18 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "arguments": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 11,
+              "line": 19,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 19,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+      "this": Object {
+        "refs": Array [
+          Object {
+            "end": Object {
+              "column": 6,
+              "line": 18,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "meta": null,
+            "start": Object {
+              "column": 2,
+              "line": 18,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "ref",
+          },
+        ],
+        "type": "implicit",
+      },
+    },
+    "displayName": "inner",
+    "end": Object {
+      "column": 1,
+      "line": 20,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 1,
+      "line": 17,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "function",
+  },
+  Object {
+    "bindings": Object {
+      "inner": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 20,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 1,
+                "line": 17,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 15,
+              "line": 17,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 10,
+              "line": 17,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-expr",
+          },
+        ],
+        "type": "const",
+      },
+    },
+    "displayName": "Function Expression",
+    "end": Object {
+      "column": 1,
+      "line": 20,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 1,
+      "line": 17,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "aLet": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "aVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "cls": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "def": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "named",
+            "start": Object {
+              "column": 9,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "namespace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 30,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 12,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-ns-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "otherNamed": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "thing",
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
+
+exports[`Parser.getScopes finds scope bindings with proper types: getScopes finds scope bindings with proper types at line 23 column 0 1`] = `
+Array [
+  Object {
+    "bindings": Object {
+      "blockFn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 22,
+                "line": 23,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 2,
+                "line": 23,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 18,
+              "line": 23,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 11,
+              "line": 23,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "let",
+      },
+    },
+    "displayName": "Block",
+    "end": Object {
+      "column": 1,
+      "line": 24,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 22,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {
+      "aConst": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 18,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 15,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 12,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 15,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "const",
+          },
+        ],
+        "type": "const",
+      },
+      "aLet": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 14,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 14,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "let",
+          },
+        ],
+        "type": "let",
+      },
+      "aVar": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 9,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 13,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 8,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 4,
+              "line": 13,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "var",
+          },
+        ],
+        "type": "var",
+      },
+      "cls": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 1,
+                "line": 11,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 7,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 9,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 6,
+              "line": 7,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "class-decl",
+          },
+        ],
+        "type": "let",
+      },
+      "def": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 19,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 1,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 10,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "default",
+            "start": Object {
+              "column": 7,
+              "line": 1,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "fn": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 16,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 6,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 11,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 9,
+              "line": 6,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "fn-decl",
+          },
+        ],
+        "type": "var",
+      },
+      "named": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 25,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 2,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 14,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "named",
+            "start": Object {
+              "column": 9,
+              "line": 2,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "namespace": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 30,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 4,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 21,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "start": Object {
+              "column": 12,
+              "line": 4,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-ns-decl",
+          },
+        ],
+        "type": "const",
+      },
+      "otherNamed": Object {
+        "refs": Array [
+          Object {
+            "declaration": Object {
+              "end": Object {
+                "column": 39,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+              "start": Object {
+                "column": 0,
+                "line": 3,
+                "sourceId": "scopes/binding-types/originalSource-1",
+              },
+            },
+            "end": Object {
+              "column": 28,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "importName": "thing",
+            "start": Object {
+              "column": 18,
+              "line": 3,
+              "sourceId": "scopes/binding-types/originalSource-1",
+            },
+            "type": "import-decl",
+          },
+        ],
+        "type": "import",
+      },
+      "this": Object {
+        "refs": Array [],
+        "type": "implicit",
+      },
+    },
+    "displayName": "Module",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Lexical Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "block",
+  },
+  Object {
+    "bindings": Object {},
+    "displayName": "Global",
+    "end": Object {
+      "column": 0,
+      "line": 25,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "scopeKind": "",
+    "start": Object {
+      "column": 0,
+      "line": 1,
+      "sourceId": "scopes/binding-types/originalSource-1",
+    },
+    "type": "object",
+  },
+]
+`;
diff --git a/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getSymbols.spec.js.snap b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getSymbols.spec.js.snap
new file mode 100644
index 0000000000..d1fd35376d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/getSymbols.spec.js.snap
@@ -0,0 +1,169 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Parser.getSymbols allSymbols 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols call expression 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols call sites 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols class 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols component 1`] = `
+"hasJsx: true
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols destruct 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols es6 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols expression 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols finds symbols in an html file 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols flow 1`] = `
+"hasJsx: false
+
+hasTypes: true
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols func 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols function names 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols jsx 1`] = `
+"hasJsx: true
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols math 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols object expressions 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols optional chaining 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols private fields 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols proto 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols react component 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: React"
+`;
+
+exports[`Parser.getSymbols regexp 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
+
+exports[`Parser.getSymbols var 1`] = `
+"hasJsx: false
+
+hasTypes: false
+
+framework: null"
+`;
diff --git a/devtools/client/debugger/src/workers/parser/tests/__snapshots__/validate.spec.js.snap b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/validate.spec.js.snap
new file mode 100644
index 0000000000..a341538a5d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/__snapshots__/validate.spec.js.snap
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`has syntax error should return the error object for the invalid expression 1`] = `"SyntaxError : Missing semicolon. (1:3)"`;
diff --git a/devtools/client/debugger/src/workers/parser/tests/contains.spec.js b/devtools/client/debugger/src/workers/parser/tests/contains.spec.js
new file mode 100644
index 0000000000..741f1a29fc
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/contains.spec.js
@@ -0,0 +1,250 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { containsPosition, containsLocation } from "../utils/contains";
+
+function getTestLoc() {
+  return {
+    start: {
+      line: 10,
+      column: 2,
+    },
+    end: {
+      line: 12,
+      column: 10,
+    },
+  };
+}
+
+// AstPosition.column is typed as a number, but many parts of this test set it
+// to undefined. Using zero instead causes test failures, and allowing it to be
+// undefined causes many flow errors in code manipulating AstPosition.
+// Fake a coercion of undefined to number as a workaround for now.
+function undefinedColumn() {
+  return undefined;
+}
+
+function startPos(lineOffset, columnOffset) {
+  const { start } = getTestLoc();
+  return {
+    line: start.line + lineOffset,
+    column: start.column + columnOffset,
+  };
+}
+
+function endPos(lineOffset, columnOffset) {
+  const { end } = getTestLoc();
+  return {
+    line: end.line + lineOffset,
+    column: end.column + columnOffset,
+  };
+}
+
+function startLine(lineOffset = 0) {
+  const { start } = getTestLoc();
+  return {
+    line: start.line + lineOffset,
+    column: undefinedColumn(),
+  };
+}
+
+function endLine(lineOffset = 0) {
+  const { end } = getTestLoc();
+  return {
+    line: end.line + lineOffset,
+    column: undefinedColumn(),
+  };
+}
+
+function testContains(pos, bool) {
+  const loc = getTestLoc();
+  expect(containsPosition(loc, pos)).toEqual(bool);
+}
+
+describe("containsPosition", () => {
+  describe("location and postion both with the column criteria", () => {
+    /* eslint-disable jest/expect-expect */
+    it("should contain position within the location range", () =>
+      testContains(startPos(1, 1), true));
+
+    it("should not contain position out of the start line", () =>
+      testContains(startPos(-1, 0), false));
+
+    it("should not contain position out of the start column", () =>
+      testContains(startPos(0, -1), false));
+
+    it(`should contain position on the same start line and
+       within the start column`, () => testContains(startPos(0, 1), true));
+
+    it("should not contain position out of the end line", () =>
+      testContains(endPos(1, 0), false));
+
+    it("should not contain position out of the end column", () =>
+      testContains(endPos(0, 1), false));
+
+    // eslint-disable-next-line max-len
+    it("should contain position on the same end line and within the end column", () =>
+      testContains(endPos(0, -1), true));
+    /* eslint-enable jest/expect-expect */
+  });
+
+  describe("position without the column criterion", () => {
+    /* eslint-disable jest/expect-expect */
+    it("should contain position on the same start line", () =>
+      testContains(startLine(0), true));
+
+    it("should contain position on the same end line", () =>
+      testContains(endLine(0), true));
+    /* eslint-enable jest/expect-expect */
+  });
+
+  describe("location without the column criterion", () => {
+    it("should contain position on the same start line", () => {
+      const loc = getTestLoc();
+      loc.start.column = undefinedColumn();
+      const pos = {
+        line: loc.start.line,
+        column: 1,
+      };
+      expect(containsPosition(loc, pos)).toEqual(true);
+    });
+
+    it("should contain position on the same end line", () => {
+      const loc = getTestLoc();
+      loc.end.column = undefinedColumn();
+      const pos = {
+        line: loc.end.line,
+        column: 1,
+      };
+      expect(containsPosition(loc, pos)).toEqual(true);
+    });
+  });
+
+  describe("location and postion both without the column criterion", () => {
+    it("should contain position on the same start line", () => {
+      const loc = getTestLoc();
+      loc.start.column = undefinedColumn();
+      const pos = startLine();
+      expect(containsPosition(loc, pos)).toEqual(true);
+    });
+
+    it("should contain position on the same end line", () => {
+      const loc = getTestLoc();
+      loc.end.column = undefinedColumn();
+      const pos = endLine();
+      expect(containsPosition(loc, pos)).toEqual(true);
+    });
+  });
+});
+
+describe("containsLocation", () => {
+  describe("locations both with the column criteria", () => {
+    it("should contian location within the range", () => {
+      const locA = getTestLoc();
+      const locB = {
+        start: startPos(1, 1),
+        end: endPos(-1, -1),
+      };
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+
+    it("should not contian location out of the start line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.start.line--;
+      expect(containsLocation(locA, locB)).toEqual(false);
+    });
+
+    it("should not contian location out of the start column", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.start.column--;
+      expect(containsLocation(locA, locB)).toEqual(false);
+    });
+
+    it("should not contian location out of the end line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.end.line++;
+      expect(containsLocation(locA, locB)).toEqual(false);
+    });
+
+    it("should not contian location out of the end column", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.end.column++;
+      expect(containsLocation(locA, locB)).toEqual(false);
+    });
+
+    it(`should contain location on the same start line and
+        within the start column`, () => {
+      const locA = getTestLoc();
+      const locB = {
+        start: startPos(0, 1),
+        end: endPos(-1, -1),
+      };
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+
+    it(`should contain location on the same end line and
+        within the end column`, () => {
+      const locA = getTestLoc();
+      const locB = {
+        start: startPos(1, 1),
+        end: endPos(0, -1),
+      };
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+  });
+
+  describe("location A without the column criterion", () => {
+    it("should contain location on the same start line", () => {
+      const locA = getTestLoc();
+      locA.start.column = undefinedColumn();
+      const locB = getTestLoc();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+
+    it("should contain location on the same end line", () => {
+      const locA = getTestLoc();
+      locA.end.column = undefinedColumn();
+      const locB = getTestLoc();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+  });
+
+  describe("location B without the column criterion", () => {
+    it("should contain location on the same start line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.start.column = undefinedColumn();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+
+    it("should contain location on the same end line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locB.end.column = undefinedColumn();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+  });
+
+  describe("locations both without the column criteria", () => {
+    it("should contain location on the same start line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locA.start.column = undefinedColumn();
+      locB.start.column = undefinedColumn();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+
+    it("should contain location on the same end line", () => {
+      const locA = getTestLoc();
+      const locB = getTestLoc();
+      locA.end.column = undefinedColumn();
+      locB.end.column = undefinedColumn();
+      expect(containsLocation(locA, locB)).toEqual(true);
+    });
+  });
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/findOutOfScopeLocations.spec.js b/devtools/client/debugger/src/workers/parser/tests/findOutOfScopeLocations.spec.js
new file mode 100644
index 0000000000..a2177c22eb
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/findOutOfScopeLocations.spec.js
@@ -0,0 +1,80 @@
+/* eslint max-nested-callbacks: ["error", 4]*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import findOutOfScopeLocations from "../findOutOfScopeLocations";
+
+import { populateSource } from "./helpers";
+
+function formatLines(actual) {
+  return actual
+    .map(
+      ({ start, end }) =>
+        `(${start.line}, ${start.column}) -> (${end.line}, ${end.column})`
+    )
+    .join("\n");
+}
+
+describe("Parser.findOutOfScopeLocations", () => {
+  it("should exclude non-enclosing function blocks", () => {
+    const source = populateSource("outOfScope");
+    const actual = findOutOfScopeLocations({
+      source,
+      line: 5,
+      column: 5,
+    });
+
+    expect(formatLines(actual)).toMatchSnapshot();
+  });
+
+  it("should roll up function blocks", () => {
+    const source = populateSource("outOfScope");
+    const actual = findOutOfScopeLocations({
+      source,
+      line: 24,
+      column: 0,
+    });
+
+    expect(formatLines(actual)).toMatchSnapshot();
+  });
+
+  it("should exclude function for locations on declaration", () => {
+    const source = populateSource("outOfScope");
+    const actual = findOutOfScopeLocations({
+      source,
+      line: 3,
+      column: 12,
+    });
+
+    expect(formatLines(actual)).toMatchSnapshot();
+  });
+
+  it("should treat comments as out of scope", () => {
+    const source = populateSource("outOfScopeComment");
+    const actual = findOutOfScopeLocations({
+      source,
+      line: 3,
+      column: 2,
+    });
+
+    expect(actual.length).toBe(1);
+
+    const location = actual[0];
+    expect(location.start.line).toBe(1);
+    expect(location.start.column).toBe(0);
+
+    expect(location.end.line).toBe(1);
+    expect(location.end.column).toBe(15);
+  });
+
+  it("should not exclude in-scope inner locations", () => {
+    const source = populateSource("outOfScope");
+    const actual = findOutOfScopeLocations({
+      source,
+      line: 61,
+      column: 0,
+    });
+    expect(formatLines(actual)).toMatchSnapshot();
+  });
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/allSymbols.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/allSymbols.js
new file mode 100644
index 0000000000..bebda9f36a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/allSymbols.js
@@ -0,0 +1,33 @@
+const TIME = 60;
+let count = 0;
+
+function incrementCounter(counter) {
+  return counter++;
+}
+
+const sum = (a, b) => a + b;
+
+const Obj = {
+  foo: 1,
+  doThing() {
+    console.log("hey");
+  },
+  doOtherThing: function() {
+    return 42;
+  }
+};
+
+Obj.property = () => {};
+Obj.otherProperty = 1;
+
+class Ultra {
+  constructor() {
+    this.awesome = true;
+  }
+
+  beAwesome(person) {
+    console.log(`${person} is Awesome!`);
+  }
+}
+
+this.props.history.push(`/dacs/${this.props.dac.id}`);
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/async.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/async.js
new file mode 100644
index 0000000000..43216be635
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/async.js
@@ -0,0 +1,10 @@
+async function foo() {
+  return new Promise(resolve => {
+    setTimeout(resolve, 10);
+  });
+}
+
+async function stuff() {
+  await foo(1);
+  await foo(2);
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/call-sites.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/call-sites.js
new file mode 100644
index 0000000000..aa73700d93
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/call-sites.js
@@ -0,0 +1,4 @@
+aaa(bbb(), ccc());
+dddd()
+  .eee()
+  .ffff();
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/callExpressions.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/callExpressions.js
new file mode 100644
index 0000000000..2771dede6a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/callExpressions.js
@@ -0,0 +1,7 @@
+dispatch({ d });
+function evaluate(script, { frameId } = {frameId: 3}, {c} = {c: 2}) {}
+
+a(b(c()));
+
+a.b().c();
+a.b.c.d();
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/calls.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/calls.js
new file mode 100644
index 0000000000..f05d445db7
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/calls.js
@@ -0,0 +1,21 @@
+foo(1, '2', bar())
+
+foo()
+  .bar()
+  .bazz()
+
+console.log('yo')
+
+foo(
+  1,
+  bar()
+)
+
+var a = 3;
+
+// set a step point at the first call expression in step expressions
+var x = { a: a(), b: b(), c: c() };
+var b = [ foo() ];
+[ a(), b(), c() ];
+(1, a(), b());
+x(1, a(), b());
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/class.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/class.js
new file mode 100644
index 0000000000..59d612ebfe
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/class.js
@@ -0,0 +1,28 @@
+class Test {
+  publicProperty;
+  #privateProperty = "default";
+  static myStatic = "static";
+  static hello() {
+    return "Hello " + this.myStatic
+  }
+  static {
+    const x = this.myStatic;
+  }
+
+  constructor() {
+    this.publicProperty = "foo";
+    this.#privateProperty = "bar";
+  }
+
+  bar(a) {
+    console.log("bar", a);
+  }
+
+  baz = b => {
+    return b * 2;
+  };
+}
+
+class Test2 {}
+
+let expressiveClass = class {};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/component.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/component.js
new file mode 100644
index 0000000000..38d9b00096
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/component.js
@@ -0,0 +1,84 @@
+/*
+ * class
+ */
+
+class Punny extends Component {
+  constructor(props) {
+    super();
+    this.onClick = this.onClick.bind(this);
+  }
+
+  componentDidMount() {}
+
+  onClick() {}
+
+  renderMe() {
+    return <div onClick={this.onClick} />;
+  }
+
+  render() {}
+}
+
+/*
+ * CALL EXPRESSIONS - createClass, extend
+ */
+
+const TodoView = Backbone.View.extend({
+  tagName: "li",
+
+  render: function() {
+    console.log("yo");
+  }
+});
+
+const TodoClass = createClass({
+  tagName: "li",
+
+  render: function() {
+    console.log("yo");
+  }
+});
+
+TodoClass = createClass({
+  tagName: "li",
+
+  render: function() {
+    console.log("yo");
+  }
+});
+
+app.TodoClass = createClass({
+  tagName: "li",
+
+  render: function() {
+    console.log("yo");
+  }
+});
+
+/*
+ * PROTOTYPE
+ */
+
+function Button() {
+  if (!(this instanceof Button)) return new Button();
+  this.color = null;
+  Nanocomponent.call(this);
+}
+
+Button.prototype = Object.create(Nanocomponent.prototype);
+
+var x = function() {};
+
+Button.prototype.createElement = function(color) {
+  this.color = color;
+  return html`
+    <button style="background-color: ${color}">
+      Click Me
+    </button>
+  `;
+};
+
+// Implement conditional rendering
+Button.prototype.update = function(newColor) {
+  return newColor !== this.color;
+};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/computed-props.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/computed-props.js
new file mode 100644
index 0000000000..4c0f182f33
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/computed-props.js
@@ -0,0 +1,8 @@
+(function(key) {
+  let obj = {
+    b: 5
+  };
+  obj[key] = 0;
+  const c = obj.b;
+  return obj;
+})("a");
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/control-flow.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/control-flow.js
new file mode 100644
index 0000000000..b9e859ff74
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/control-flow.js
@@ -0,0 +1,39 @@
+
+if (x) {
+  foo();
+}
+else if (y) {
+  foo();
+}
+else {
+  foo();
+}
+
+for (var i=0; i< 5; i++ ) {
+  foo();
+}
+
+while (x) {
+  foo();
+}
+
+switch (c) {
+  case a:
+    console.log('hi')
+}
+
+var a = 3;
+
+for (const val of [1, 2]) {
+  console.log("pause again", val);
+}
+
+for (const val of vals) {
+  console.log("pause again", val);
+}
+
+try {
+} catch (e) {
+}
+
+with (e) {}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/decorators.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/decorators.js
new file mode 100644
index 0000000000..22c0a1398d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/decorators.js
@@ -0,0 +1,2 @@
+@annotation
+class MyClass { }
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/destructuring.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/destructuring.js
new file mode 100644
index 0000000000..52686e6573
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/destructuring.js
@@ -0,0 +1,16 @@
+const { b, resty } = compute(stuff);
+const { first: f, last: l } = obj;
+
+const [a, ...rest] = compute(stuff);
+const [x] = ["a"];
+
+for (const [index, element] of arr.entries()) {
+  console.log(index, element);
+}
+
+const { a: aa = 10, b: bb = 5 } = { a: 3 };
+const { temp: [{ foo: foooo }] } = obj;
+
+let { [key]: foo } = { z: "bar" };
+
+let [, prefName] = prefsBlueprint[accessorName];
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/es6.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/es6.js
new file mode 100644
index 0000000000..90b53141f4
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/es6.js
@@ -0,0 +1 @@
+dispatch({ ...action, [PROMISE]: promise });
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/expression.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/expression.js
new file mode 100644
index 0000000000..fa80b68add
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/expression.js
@@ -0,0 +1,25 @@
+const obj = { a: { b: 2 } }; // e.g. obj.a.b
+const foo = obj2.c.secondProperty; // e.g. foo.obj2.c.secondProperty
+
+// computed properties
+const com = { [a]: { b: "c", [d]: "e" }, [b]: 3 }; // e.g. com[a].b
+const firstAuthor = collection.books[1].author;
+const firstActionDirector = collection.genres["sci-fi"].movies[0].director;
+
+app.TodoView = Backbone.extend({
+  render: function() {}
+});
+
+// assignments
+obj.foo = { a: { b: "c" }, b: 3 }; // e.g. obj.foo.a.b
+com = { a: { b: "c" }, b: 3 }; // e.g. com.a.b
+
+// arrays
+const res = [{ a: 2 }, { b: 3 }]; // e.g. res[1].b
+const res2 = { a: [{ b: 2 }] }; // e.g. res.a[0].b
+const res3 = { a: [{ b: 2 }], b: [{ c: 3 }] }; // e.g. res.a[0].b
+const res4 = [[{ a: 3 }], [{ b: a.b.c.v.d }]]; // e.g. res[1][0].b
+
+function params({ a, b }) {} // e.g. a
+var pars = function({ a, b }) {};
+const evil = obj2.doEvil().c.secondProperty; // e.g. obj2.doEvil or ""
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/flow.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/flow.js
new file mode 100644
index 0000000000..1135bd62a4
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/flow.js
@@ -0,0 +1,5 @@
+class App extends Component {
+  renderHello(name: string, action: ReduxAction, { todos }: Props) {
+    return `howdy ${name}`;
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1FalsePositive.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1FalsePositive.js
new file mode 100644
index 0000000000..5220f26c8c
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1FalsePositive.js
@@ -0,0 +1,11 @@
+const frameworkStars = {
+  angular: 40779,
+  react: 111576,
+  vue: 114358,
+};
+
+const container = new Container();
+container.module("sum", (...args) => args.reduce((s, c) => s + c, 0));
+
+container.get("sum",
+  (sum) => sum(Object.values(frameworkStars)));
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1Module.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1Module.js
new file mode 100644
index 0000000000..f0e8c381ef
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/angular1Module.js
@@ -0,0 +1,4 @@
+angular.module('something', ['ngRoute', 'ngResource'])
+	.config(function ($routeProvider) {
+		'use strict';
+	});
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/plainJavascript.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/plainJavascript.js
new file mode 100644
index 0000000000..41609f8715
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/plainJavascript.js
@@ -0,0 +1,8 @@
+"use strict"
+
+const a = 2;
+
+function test(a) {
+    return a;
+}
+
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponent.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponent.js
new file mode 100644
index 0000000000..37f3ac49e5
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponent.js
@@ -0,0 +1,3 @@
+import React, { Component } from "react";
+
+class PrimaryPanes extends Component {}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponentEs5.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponentEs5.js
new file mode 100644
index 0000000000..a4370b5369
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactComponentEs5.js
@@ -0,0 +1,3 @@
+var React = require("react");
+
+class PrimaryPanes extends React.Component {}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactLibrary.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactLibrary.js
new file mode 100644
index 0000000000..9ca048e77f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reactLibrary.js
@@ -0,0 +1,19 @@
+/**
+ * Base class helpers for the updating state of a component.
+ */
+function Component(props, context, updater) {
+  this.props = props;
+  this.context = context;
+  // If a component has string refs, we will assign a different object later.
+  this.refs = emptyObject;
+  // We initialize the default updater but the real one gets injected by the
+  // renderer.
+  this.updater = updater || ReactNoopUpdateQueue;
+}
+
+Component.prototype.isReactComponent = {};
+Component.prototype.setState = function (partialState, callback) {
+  !(typeof partialState === 'object' || typeof partialState === 'function' || partialState == null)
+    ? invariant(false, 'setState(...): takes an object of state variables to update or a function which returns an object of state variables.') : void 0;
+  this.updater.enqueueSetState(this, partialState, callback, 'setState');
+};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reduxLibrary.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reduxLibrary.js
new file mode 100644
index 0000000000..b86c8fb0cf
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/reduxLibrary.js
@@ -0,0 +1,39 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (factory((global.Redux = {})));
+  }(this, (function (exports) { 'use strict';
+  
+  function symbolObservablePonyfill(root) {
+    var result;
+    var Symbol = root.Symbol;
+  
+    if (typeof Symbol === 'function') {
+      if (Symbol.observable) {
+        result = Symbol.observable;
+      } else {
+        result = Symbol('observable');
+        Symbol.observable = result;
+      }
+    } else {
+      result = '@@observable';
+    }
+  
+    return result;
+  }
+  
+  /* global window */
+  
+  var root;
+  
+  if (typeof self !== 'undefined') {
+    root = self;
+  } else if (typeof window !== 'undefined') {
+    root = window;
+  } else if (typeof global !== 'undefined') {
+    root = global;
+  } else if (typeof module !== 'undefined') {
+    root = module;
+  } else {
+    root = Function('return this')();
+  }
\ No newline at end of file
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileComponent.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileComponent.js
new file mode 100644
index 0000000000..d41e55b72b
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileComponent.js
@@ -0,0 +1,3 @@
+Vue.component('test-item', {
+  template: '<li>This is a test item</li>'
+})
\ No newline at end of file
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileDeclarative.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileDeclarative.js
new file mode 100644
index 0000000000..844fce1451
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/frameworks/vueFileDeclarative.js
@@ -0,0 +1,6 @@
+var app = new Vue({
+  el: '#app',
+  data: {
+    message: 'Hello Vue!'
+  }
+})
\ No newline at end of file
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/func.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/func.js
new file mode 100644
index 0000000000..bb0d4c1b05
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/func.js
@@ -0,0 +1,50 @@
+function square(n) {
+  return n * n;
+}
+
+export function exFoo() {
+  return "yay";
+}
+
+async function slowFoo() {
+  return "meh";
+}
+
+export async function exSlowFoo() {
+  return "yay in a bit";
+}
+
+function ret() {
+  return foo();
+}
+
+child = function() {};
+
+(function() {
+  2;
+})();
+
+const obj = {
+  foo: function name() {
+    2 + 2;
+  },
+
+  bar() {
+    2 + 2;
+  }
+};
+
+export default function root() {
+}
+
+function test(a1, a2 = 45, { a3, a4, a5: { a6: a7 } = {} } = {}) {
+  console.log("pause next here");
+}
+
+() => (x = 4);
+
+function ret2() {
+  return (
+    foo()
+  );
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/functionNames.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/functionNames.js
new file mode 100644
index 0000000000..2ae38fc548
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/functionNames.js
@@ -0,0 +1,50 @@
+/* eslint-disable */
+
+({
+  foo: function() {},
+  "foo": function() {},
+  42: function() {},
+
+  foo() {},
+  "foo"() {},
+  42() {},
+});
+
+foo = function() {};
+obj.foo = function() {};
+
+var foo = function(){};
+var [foo = function(){}] = [];
+var {foo = function(){}} = {};
+
+[foo = function(){}] = [];
+({foo = function(){}} = {});
+({bar: foo = function(){}} = {});
+
+function fn([foo = function(){}]){}
+function f2({foo = function(){}} = {}){}
+function f3({bar: foo = function(){}} = {}){}
+
+class Cls {
+  foo = function() {};
+  "foo" = function() {};
+  42 = function() {};
+
+  foo() {}
+  "foo"() {}
+  42() {}
+}
+
+(function(){});
+
+export default function (){}
+
+const defaultObj = {a: 1};
+const defaultArr = ['smthng'];
+function a(first, second){}
+function b(first = 'bla', second){}
+function c(first = {}, second){}
+function d(first = [], second){}
+function e(first = defaultObj, second){}
+function f(first = defaultArr, second){}
+function g(first = null, second){}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/generators.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/generators.js
new file mode 100644
index 0000000000..7c71838827
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/generators.js
@@ -0,0 +1,4 @@
+function* foo() {
+  yield 1;
+  yield 2;
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/jsx.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/jsx.js
new file mode 100644
index 0000000000..c781f7666f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/jsx.js
@@ -0,0 +1,5 @@
+const jsxElement = <h1> Hi ! I'm here ! </h1>;
+
+<div id="3" res={foo()}>
+  <Item>{foo()}</Item>
+</div>
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/math.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/math.js
new file mode 100644
index 0000000000..508d28ca99
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/math.js
@@ -0,0 +1,15 @@
+function math(n) {
+  function square(n) {
+    // inline comment
+    n * n;
+  }
+
+  // document some lines
+  const two = square(2);
+
+  const four = squaare(4);
+  return two * four;
+}
+
+var child = function() {};
+child2 = function() {};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/modules.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/modules.js
new file mode 100644
index 0000000000..8ba351497e
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/modules.js
@@ -0,0 +1,10 @@
+import {x} from "y"
+import z from "y";
+
+export class AppComponent {
+  title = 'app'
+}
+
+export default class AppComponent {
+  title = 'app'
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/object-expressions.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/object-expressions.js
new file mode 100644
index 0000000000..b7f4806e04
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/object-expressions.js
@@ -0,0 +1,6 @@
+const y = ({ params });
+const foo = ({ b });
+const bar = { x: 3, y: "434", z: true, a: null, s: c * 2, d : getValue(2) }
+const params = frameId ? { frameActor: frameId } : {}
+
+const collection = {genres: {"sci-fi": {movies: [{director: "yo"}]}}}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/optional-chaining.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/optional-chaining.js
new file mode 100644
index 0000000000..757335f78b
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/optional-chaining.js
@@ -0,0 +1,3 @@
+const obj = {};
+obj?.a;
+obj?.a?.b ?? [];
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScope.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScope.js
new file mode 100644
index 0000000000..30218f546b
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScope.js
@@ -0,0 +1,62 @@
+// Program Scope
+
+function outer() {
+  function inner() {
+    const x = 1;
+  }
+
+  const arrow = () => {
+    const x = 1;
+  };
+
+  const declaration = function() {
+    const x = 1;
+  };
+
+  assignment = (function() {
+    const x = 1;
+  })();
+
+  const iifeDeclaration = (function() {
+    const x = 1;
+  })();
+
+  return function() {
+    const x = 1;
+  };
+}
+
+function exclude() {
+  function another() {
+    const x = 1;
+  }
+}
+
+const globalArrow = () => {
+  const x = 1;
+};
+
+const globalDeclaration = function() {
+  const x = 1;
+};
+
+globalAssignment = (function() {
+  const x = 1;
+})();
+
+const globalIifeDeclaration = (function() {
+  const x = 1;
+})();
+
+function parentFunc() {
+  let MAX = 3;
+  let nums = [0, 1, 2, 3];
+  let x = 1;
+  let y = nums.find(function(n) {
+    return n == x;
+  });
+  function innerFunc(a) {
+    return Math.max(a, MAX);
+  }
+  return innerFunc(y);
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScopeComment.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScopeComment.js
new file mode 100644
index 0000000000..bc02f94671
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/outOfScopeComment.js
@@ -0,0 +1,4 @@
+// Some comment
+(function() {
+  const x = 1;
+})();
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/parseScriptTags.html b/devtools/client/debugger/src/workers/parser/tests/fixtures/parseScriptTags.html
new file mode 100644
index 0000000000..6283f0ee98
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/parseScriptTags.html
@@ -0,0 +1,42 @@
+<html>
+<head>
+	<script type="text/javascript">
+		var globalObject = {
+			first: "name",
+			last: "words"
+		};
+		function sayHello (name) {
+			return `Hello, ${name}!`;
+		}
+	</script>
+	<style>
+		BODY {
+			font-size: 48px;
+			color: rebeccapurple;
+		}
+	</style>
+</head>
+<body>
+	<h1>Testing Script Tags in HTML</h1>
+	<script>
+		const capitalize = name => {
+			return name[0].toUpperCase() + name.substring(1)
+		};
+		const greetAll = ["my friend", "buddy", "world"]
+			.map(capitalize)
+			.map(sayHello)
+			.join("\n");
+
+		globalObject.greetings = greetAll;
+	</script>
+	<p>
+		Some arbitrary intermediate content to affect the offsets of the scripts
+	</p>
+	<script>
+		(function iife() {
+			const greeting = sayHello("Ryan");
+			console.log(greeting);
+		})();
+	</script>
+</body>
+</html>
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/private-fields.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/private-fields.js
new file mode 100644
index 0000000000..ca9abc8f1d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/private-fields.js
@@ -0,0 +1,24 @@
+class MyClass {
+  constructor(secret, ...rest) {
+    const self = this;
+    this.#secret = secret;
+    self.#restParams = rest;
+  }
+
+  #secret;
+  #restParams;
+  #salt = "bloup";
+  creationDate = new Date();
+
+  #getSalt() {
+    return this.#salt;
+  }
+
+  debug() {
+    const self = this;
+    const creationDate = this.creationDate;
+    const secret = this.#secret;
+    const salt = self.#getSalt();
+    return `${creationDate}|${salt}|${secret}`;
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/proto.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/proto.js
new file mode 100644
index 0000000000..38c3b63ac7
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/proto.js
@@ -0,0 +1,14 @@
+const foo = function() {};
+
+const bar = () => {};
+
+const TodoView = Backbone.View.extend({
+  tagName: "li",
+  initialize: function() {},
+  doThing(b) {
+    console.log("hi", b);
+  },
+  render: function() {
+    return this;
+  }
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/regexp.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/regexp.js
new file mode 100644
index 0000000000..fb0f13b0d0
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/regexp.js
@@ -0,0 +1 @@
+const re = /^\p{RGI_Emoji}$/v;
\ No newline at end of file
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/resolveToken.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/resolveToken.js
new file mode 100644
index 0000000000..4660f0f568
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/resolveToken.js
@@ -0,0 +1,40 @@
+const a = 1;
+let b = 0;
+
+function getA() {
+  return a;
+}
+
+function setB(newB) {
+  b = newB;
+}
+
+const plusAB = (function(x, y) {
+  const obj = { x, y };
+  function insideClosure(alpha, beta) {
+    return alpha + beta + obj.x + obj.y;
+  }
+
+  return insideClosure;
+})(a, b);
+
+function withMultipleScopes() {
+  var outer = 1;
+  function innerScope() {
+    var inner = outer + 1;
+    return inner;
+  }
+
+  const fromIIFE = (function(toIIFE) {
+    return innerScope() + toIIFE;
+  })(1);
+
+  {
+    // random block
+    let x = outer + fromIIFE;
+    if (x) {
+      const y = x * x;
+      console.log(y);
+    }
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/arrow-function.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/arrow-function.js
new file mode 100644
index 0000000000..4ec72fd450
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/arrow-function.js
@@ -0,0 +1,11 @@
+export {};
+
+let outer = (p1) => {
+  console.log(this);
+
+  (function() {
+    var inner = (p2) => {
+      console.log(this);
+    };
+  })();
+};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/binding-types.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/binding-types.js
new file mode 100644
index 0000000000..8c9cc05d1d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/binding-types.js
@@ -0,0 +1,24 @@
+import def from "";
+import { named } from "";
+import { thing as otherNamed } from "";
+import * as namespace from "";
+
+function fn() {}
+class cls {
+  method(){
+
+  }
+}
+
+var aVar;
+let aLet;
+const aConst = "";
+
+(function inner() {
+  this;
+  arguments;
+});
+
+{
+  function blockFn(){}
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/block-statement.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/block-statement.js
new file mode 100644
index 0000000000..5e64d1180f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/block-statement.js
@@ -0,0 +1,13 @@
+export {};
+
+let first;
+
+{
+  var second;
+  function third() {}
+  class Fourth {}
+  let fifth;
+  const sixth = 6;
+}
+
+var seventh;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-declaration.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-declaration.js
new file mode 100644
index 0000000000..1c2c74dcbc
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-declaration.js
@@ -0,0 +1,14 @@
+export {};
+
+class Outer {
+  method() {
+    class Inner {
+      m() {
+        console.log(this);
+      }
+    }
+  }
+}
+
+@decorator
+class Second {}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-expression.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-expression.js
new file mode 100644
index 0000000000..16b6841d71
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-expression.js
@@ -0,0 +1,11 @@
+export {};
+
+var Outer = class Outer {
+  method() {
+    var Inner = class {
+      m() {
+        console.log(this);
+      }
+    };
+  }
+};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-property.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-property.js
new file mode 100644
index 0000000000..a80cad3a87
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/class-property.js
@@ -0,0 +1,10 @@
+export {};
+
+class Foo {
+  prop = this.init();
+
+  other = do {
+    var one;
+    let two;
+  };
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/complex-nesting.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/complex-nesting.js
new file mode 100644
index 0000000000..40763f556f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/complex-nesting.js
@@ -0,0 +1,29 @@
+function named(module, exports, __webpack_require__) {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = root;
+function root() {
+  function fn(arg) {
+    var _this = this,
+        _arguments = arguments;
+
+    console.log(this, arguments);
+    console.log("pause here", fn, root);
+
+    var arrow = function arrow(argArrow) {
+      console.log(_this, _arguments);
+      console.log("pause here", fn, root);
+    };
+    arrow("arrow-arg");
+  }
+
+  fn.call("this-value", "arg-value");
+}
+module.exports = exports["default"];
+
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/expressions.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/expressions.js
new file mode 100644
index 0000000000..6698acd8e8
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/expressions.js
@@ -0,0 +1,6 @@
+const foo = {};
+
+foo.bar().baz;
+(0, foo.bar)().baz;
+Object(foo.bar)().baz;
+__webpack_require__.i(foo.bar)().baz;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/flowtype-bindings.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/flowtype-bindings.js
new file mode 100644
index 0000000000..385797c044
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/flowtype-bindings.js
@@ -0,0 +1,11 @@
+import type { One, Two, Three } from "./src/mod";
+
+type Other = {
+  root: typeof root,
+};
+
+const aConst = (window: Array<string>);
+
+export default function root() {
+
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/fn-body-lex-and-nonlex.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/fn-body-lex-and-nonlex.js
new file mode 100644
index 0000000000..a7f6d7670a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/fn-body-lex-and-nonlex.js
@@ -0,0 +1,23 @@
+function fn() {
+  var nonlex;
+  let lex;
+
+}
+
+function fn2() {
+  function nonlex(){}
+  let lex;
+
+}
+
+function fn3() {
+  var nonlex;
+  class Thing {}
+
+}
+
+function fn4() {
+  function nonlex(){}
+  class Thing {}
+
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/for-loops.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/for-loops.js
new file mode 100644
index 0000000000..747eeeae7d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/for-loops.js
@@ -0,0 +1,13 @@
+export {};
+
+for (var one;;) {}
+for (let two;;) {}
+for (const three = 3;;) {}
+
+for (var four in {}) {}
+for (let five in {}) {}
+for (const six in {}) {}
+
+for (var seven of {}) {}
+for (let eight of {}) {}
+for (const nine of {}) {}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-declaration.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-declaration.js
new file mode 100644
index 0000000000..759374b437
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-declaration.js
@@ -0,0 +1,11 @@
+export {};
+
+function outer(p1) {}
+
+{
+  function middle(p2) {
+    function inner(p3) {}
+
+    console.log(this);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-expression.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-expression.js
new file mode 100644
index 0000000000..436413533e
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/function-expression.js
@@ -0,0 +1,7 @@
+export {};
+
+let fn = function(p1) {};
+
+let fn2 = function withName(p2) {
+  console.log(this);
+};
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/jsx-component.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/jsx-component.js
new file mode 100644
index 0000000000..ffe1c1dfce
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/jsx-component.js
@@ -0,0 +1,6 @@
+import SomeComponent from "";
+
+<SomeComponent attr="value" />;
+<SomeComponent attr="value"></SomeComponent>;
+<SomeComponent.prop attr="value" />;
+<SomeComponent.prop.child attr="value" />;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/out-of-order-declarations.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/out-of-order-declarations.js
new file mode 100644
index 0000000000..4f36d9fc38
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/out-of-order-declarations.js
@@ -0,0 +1,21 @@
+var val;
+
+export default function root() {
+  var val;
+
+  var fn;
+
+  this;
+
+  function callback() {
+    console.log(val, fn, callback, root, this);
+
+    var val;
+
+    function fn(){};
+  }
+
+  callback();
+}
+
+import aDefault from "./src/mod";
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/pattern-declarations.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/pattern-declarations.js
new file mode 100644
index 0000000000..6810ef4614
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/pattern-declarations.js
@@ -0,0 +1,2 @@
+var { prop: one } = {};
+var [ two ] = [];
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/simple-module.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/simple-module.js
new file mode 100644
index 0000000000..b25cc7a863
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/simple-module.js
@@ -0,0 +1,11 @@
+import foo from "foo";
+
+console.log(foo);
+
+var one = 1;
+let two = 2;
+const three = 3;
+
+function fn() {}
+
+this;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/switch-statement.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/switch-statement.js
new file mode 100644
index 0000000000..7163c3811d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/switch-statement.js
@@ -0,0 +1,22 @@
+export {};
+
+switch (foo) {
+  case "zero":
+    var zero;
+  case "one":
+    let one;
+  case "two":
+    let two;
+  case "three": {
+    let three;
+  }
+}
+
+switch (foo) {
+  case "":
+    function two(){}
+}
+switch (foo) {
+  case "":
+    class three {}
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/try-catch.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/try-catch.js
new file mode 100644
index 0000000000..8ccf4db592
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/try-catch.js
@@ -0,0 +1,9 @@
+export {};
+
+try {
+  var first;
+  let second;
+} catch (err) {
+  var third;
+  let fourth;
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/ts-sample.ts b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/ts-sample.ts
new file mode 100644
index 0000000000..e23ff83754
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/ts-sample.ts
@@ -0,0 +1,41 @@
+
+// TSEnumDeclaration
+enum Color {
+  // TSEnumMember
+  Red,
+  Green,
+  Blue,
+}
+
+class Example<T> {
+  // TSParameterProperty
+  constructor(public foo) {
+
+  }
+
+  method(): never {
+    throw new Error();
+  }
+}
+
+// TSTypeAssertion
+var foo = <any>window;
+
+// TSAsExpression
+(window as any);
+
+// TSNonNullExpression
+(window!);
+
+// TSModuleDeclaration
+namespace TheSpace {
+  function fn() {
+
+  }
+}
+
+// TSImportEqualsDeclaration
+import ImportedClass = require("mod");
+
+// TSExportAssignment
+export = Example;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/tsx-sample.tsx b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/tsx-sample.tsx
new file mode 100644
index 0000000000..9e2b9faf8b
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/tsx-sample.tsx
@@ -0,0 +1,41 @@
+
+// TSEnumDeclaration
+enum Color {
+  // TSEnumMember
+  Red,
+  Green,
+  Blue,
+}
+
+class Example<T> {
+  // TSParameterProperty
+  constructor(public foo) {
+
+  }
+
+  method(): never {
+    throw new Error();
+  }
+}
+
+// JSXElement
+var foo = <any>window</any>;
+
+// TSAsExpression
+(window as any);
+
+// TSNonNullExpression
+(window!);
+
+// TSModuleDeclaration
+namespace TheSpace {
+  function fn() {
+
+  }
+}
+
+// TSImportEqualsDeclaration
+import ImportedClass = require("mod");
+
+// TSExportAssignment
+export = Example;
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/vue-sample.vue b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/vue-sample.vue
new file mode 100644
index 0000000000..0fceee99d1
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/scopes/vue-sample.vue
@@ -0,0 +1,26 @@
+<template>
+  <div class="hello">
+    <h1>{{ msg }}</h1>
+  </div>
+</template>
+
+<script>
+var moduleVar = "data";
+
+export default {
+  name: 'HelloWorld',
+  data () {
+    var fnVar = 4;
+
+    return {
+      msg: 'Welcome to Your Vue.js App'
+    };
+  }
+};
+</script>
+
+<style scoped>
+a {
+  color: red;
+}
+</style>
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/statements.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/statements.js
new file mode 100644
index 0000000000..f2c113570e
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/statements.js
@@ -0,0 +1,40 @@
+debugger; debugger;
+console.log("a"); console.log("a");
+
+// assignments with valid pause locations
+this.x = 3;
+var a = 4;
+var d = [foo()]
+var f = 3, e = 4;
+var g = [], h = {};
+
+// assignments with invalid pause locations
+var b = foo();
+c = foo();
+
+
+const arr = [
+  '1',
+  2,
+  foo()
+]
+
+const obj = {
+  a: '1',
+  b: 2,
+  c: foo(),
+}
+
+foo(
+  1,
+  foo(
+    1
+  ),
+  3
+)
+
+throw new Error("3");
+3;
+
+while (i < 6) { break }
+while (i < 6) { continue;}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/thisExpression.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/thisExpression.js
new file mode 100644
index 0000000000..dd398db426
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/thisExpression.js
@@ -0,0 +1,11 @@
+class Test {
+  constructor() {
+    this.foo = {
+      a: "foobar"
+    };
+  }
+
+  bar() {
+    console.log(this.foo.a);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/fixtures/var.js b/devtools/client/debugger/src/workers/parser/tests/fixtures/var.js
new file mode 100644
index 0000000000..509ad368e8
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/fixtures/var.js
@@ -0,0 +1,21 @@
+var foo = 1;
+let bar = 2;
+const baz = 3;
+const a = 4,
+  b = 5;
+a = 5;
+
+var { foo: { baw } } = {}
+var {bap} = {}
+var {ll = 3} = {}
+
+
+var [first] = [1]
+
+var { a: _a } = 3
+
+var [oh, {my: god}] = [{},{}]
+
+var [[oj], [{oy, vey: _vey, mitzvot: _mitz = 4}]] = [{},{}]
+
+var [one, ...stuff] = []
diff --git a/devtools/client/debugger/src/workers/parser/tests/framework.spec.js b/devtools/client/debugger/src/workers/parser/tests/framework.spec.js
new file mode 100644
index 0000000000..d41f45b71c
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/framework.spec.js
@@ -0,0 +1,63 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getSymbols } from "../getSymbols";
+import { populateOriginalSource } from "./helpers";
+import cases from "jest-in-case";
+
+cases(
+  "Parser.getFramework",
+  ({ name, file, value }) => {
+    const source = populateOriginalSource("frameworks/plainJavascript");
+    const symbols = getSymbols(source.id);
+    expect(symbols.framework).toBeNull();
+  },
+  [
+    {
+      name: "is undefined when no framework",
+      file: "frameworks/plainJavascript",
+      value: null,
+    },
+    {
+      name: "does not get confused with angular (#6833)",
+      file: "frameworks/angular1FalsePositive",
+      value: null,
+    },
+    {
+      name: "recognizes ES6 React component",
+      file: "frameworks/reactComponent",
+      value: "React",
+    },
+    {
+      name: "recognizes ES5 React component",
+      file: "frameworks/reactComponentEs5",
+      value: "React",
+    },
+    {
+      name: "recognizes Angular 1 module",
+      file: "frameworks/angular1Module",
+      value: "Angular",
+    },
+    {
+      name: "recognizes declarative Vue file",
+      file: "frameworks/vueFileDeclarative",
+      value: "Vue",
+    },
+    {
+      name: "recognizes component Vue file",
+      file: "frameworks/vueFileComponent",
+      value: "Vue",
+    },
+    {
+      name: "recognizes the react library file",
+      file: "framework/reactLibrary",
+      value: "React",
+    },
+    {
+      name: "recognizes the redux library file",
+      file: "framework/reduxLibrary",
+      value: "React",
+    },
+  ]
+);
diff --git a/devtools/client/debugger/src/workers/parser/tests/getScopes.spec.js b/devtools/client/debugger/src/workers/parser/tests/getScopes.spec.js
new file mode 100644
index 0000000000..a2d394ae96
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/getScopes.spec.js
@@ -0,0 +1,227 @@
+/* eslint max-nested-callbacks: ["error", 4]*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import getScopes from "../getScopes";
+import { populateOriginalSource } from "./helpers";
+import cases from "jest-in-case";
+
+cases(
+  "Parser.getScopes",
+  ({ name, file, type, locations }) => {
+    const source = populateOriginalSource(file, type);
+
+    locations.forEach(([line, column]) => {
+      const scopes = getScopes({
+        source,
+        line,
+        column,
+      });
+
+      expect(scopes).toMatchSnapshot(
+        `getScopes ${name} at line ${line} column ${column}`
+      );
+    });
+  },
+  [
+    {
+      name: "finds scope bindings in fn body with both lex and non-lex items",
+      file: "scopes/fn-body-lex-and-nonlex",
+      locations: [
+        [4, 0],
+        [10, 0],
+        [16, 0],
+        [22, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings in a vue file",
+      file: "scopes/vue-sample",
+      type: "vue",
+      locations: [[14, 0]],
+    },
+    {
+      name: "finds scope bindings in a typescript file",
+      file: "scopes/ts-sample",
+      type: "ts",
+      locations: [
+        [9, 0],
+        [13, 4],
+        [17, 0],
+        [33, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings in a typescript-jsx file",
+      file: "scopes/tsx-sample",
+      type: "tsx",
+      locations: [
+        [9, 0],
+        [13, 4],
+        [17, 0],
+        [33, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings in a module",
+      file: "scopes/simple-module",
+      locations: [[7, 0]],
+    },
+    {
+      name: "finds scope bindings in a JSX element",
+      file: "scopes/jsx-component",
+      locations: [[2, 0]],
+    },
+    {
+      name: "finds scope bindings for complex binding nesting",
+      file: "scopes/complex-nesting",
+      locations: [
+        [16, 4],
+        [20, 6],
+      ],
+    },
+    {
+      name: "finds scope bindings for function declarations",
+      file: "scopes/function-declaration",
+      locations: [
+        [2, 0],
+        [3, 20],
+        [5, 1],
+        [9, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for function expressions",
+      file: "scopes/function-expression",
+      locations: [
+        [2, 0],
+        [3, 23],
+        [6, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for arrow functions",
+      file: "scopes/arrow-function",
+      locations: [
+        [2, 0],
+        [4, 0],
+        [7, 0],
+        [8, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for class declarations",
+      file: "scopes/class-declaration",
+      locations: [
+        [2, 0],
+        [5, 0],
+        [7, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for class expressions",
+      file: "scopes/class-expression",
+      locations: [
+        [2, 0],
+        [5, 0],
+        [7, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for for loops",
+      file: "scopes/for-loops",
+      locations: [
+        [2, 0],
+        [3, 17],
+        [4, 17],
+        [5, 25],
+        [7, 22],
+        [8, 22],
+        [9, 23],
+        [11, 23],
+        [12, 23],
+        [13, 24],
+      ],
+    },
+    {
+      name: "finds scope bindings for try..catch",
+      file: "scopes/try-catch",
+      locations: [
+        [2, 0],
+        [4, 0],
+        [7, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for out of order declarations",
+      file: "scopes/out-of-order-declarations",
+      locations: [
+        [2, 0],
+        [5, 0],
+        [11, 0],
+        [14, 0],
+        [17, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for block statements",
+      file: "scopes/block-statement",
+      locations: [
+        [2, 0],
+        [6, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for class properties",
+      file: "scopes/class-property",
+      locations: [
+        [2, 0],
+        [4, 16],
+        [6, 12],
+        [7, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings and exclude Flowtype",
+      file: "scopes/flowtype-bindings",
+      locations: [
+        [8, 0],
+        [10, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings for declarations with patterns",
+      file: "scopes/pattern-declarations",
+      locations: [[1, 0]],
+    },
+    {
+      name: "finds scope bindings for switch statements",
+      file: "scopes/switch-statement",
+      locations: [
+        [2, 0],
+        [5, 0],
+        [7, 0],
+        [9, 0],
+        [11, 0],
+        [17, 0],
+        [21, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings with proper types",
+      file: "scopes/binding-types",
+      locations: [
+        [5, 0],
+        [9, 0],
+        [18, 0],
+        [23, 0],
+      ],
+    },
+    {
+      name: "finds scope bindings with expression metadata",
+      file: "scopes/expressions",
+      locations: [[2, 0]],
+    },
+  ]
+);
diff --git a/devtools/client/debugger/src/workers/parser/tests/getSymbols.spec.js b/devtools/client/debugger/src/workers/parser/tests/getSymbols.spec.js
new file mode 100644
index 0000000000..723eef1fd9
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/getSymbols.spec.js
@@ -0,0 +1,51 @@
+/* eslint max-nested-callbacks: ["error", 4]*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { formatSymbols } from "../utils/formatSymbols";
+import { populateSource, populateOriginalSource } from "./helpers";
+import cases from "jest-in-case";
+
+cases(
+  "Parser.getSymbols",
+  ({ name, file, original, type }) => {
+    const source = original
+      ? populateOriginalSource(file, type)
+      : populateSource(file, type);
+
+    expect(formatSymbols(source.id)).toMatchSnapshot();
+  },
+  [
+    { name: "es6", file: "es6", original: true },
+    { name: "func", file: "func", original: true },
+    { name: "function names", file: "functionNames", original: true },
+    { name: "math", file: "math" },
+    { name: "proto", file: "proto" },
+    { name: "class", file: "class", original: true },
+    { name: "var", file: "var" },
+    { name: "expression", file: "expression" },
+    { name: "allSymbols", file: "allSymbols" },
+    { name: "call sites", file: "call-sites" },
+    { name: "call expression", file: "callExpressions" },
+    { name: "object expressions", file: "object-expressions" },
+    { name: "optional chaining", file: "optional-chaining" },
+    { name: "private fields", file: "private-fields" },
+    {
+      name: "finds symbols in an html file",
+      file: "parseScriptTags",
+      type: "html",
+    },
+    { name: "component", file: "component", original: true },
+    {
+      name: "react component",
+      file: "frameworks/reactComponent",
+      original: true,
+    },
+    { name: "flow", file: "flow", original: true },
+    { name: "jsx", file: "jsx", original: true },
+    { name: "destruct", file: "destructuring" },
+
+    { name: "regexp", file: "regexp" },
+  ]
+);
diff --git a/devtools/client/debugger/src/workers/parser/tests/helpers/index.js b/devtools/client/debugger/src/workers/parser/tests/helpers/index.js
new file mode 100644
index 0000000000..47c358ae66
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/helpers/index.js
@@ -0,0 +1,86 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import fs from "fs";
+import path from "path";
+
+import { makeMockSourceAndContent } from "../../../../utils/test-mockup";
+import { setSource } from "../../sources";
+import * as asyncValue from "../../../../utils/async-value";
+
+export function getFixture(name, type = "js") {
+  return fs.readFileSync(
+    path.join(__dirname, `../fixtures/${name}.${type}`),
+    "utf8"
+  );
+}
+
+function getSourceContent(name, type = "js") {
+  const text = getFixture(name, type);
+  let contentType = "text/javascript";
+  if (type === "html") {
+    contentType = "text/html";
+  } else if (type === "vue") {
+    contentType = "text/vue";
+  } else if (type === "ts") {
+    contentType = "text/typescript";
+  } else if (type === "tsx") {
+    contentType = "text/typescript-jsx";
+  }
+
+  return {
+    type: "text",
+    value: text,
+    contentType,
+  };
+}
+
+export function getSource(name, type) {
+  const { value: text, contentType } = getSourceContent(name, type);
+
+  return makeMockSourceAndContent(undefined, name, contentType, text);
+}
+
+export function populateSource(name, type) {
+  const { content, ...source } = getSource(name, type);
+  setSource({
+    id: source.id,
+    text: content.value,
+    contentType: content.contentType,
+    isWasm: false,
+  });
+  return {
+    ...source,
+    content: asyncValue.fulfilled(content),
+  };
+}
+
+export function getOriginalSource(name, type) {
+  return getOriginalSourceWithContent(name, type);
+}
+
+export function getOriginalSourceWithContent(name, type) {
+  const { value: text, contentType } = getSourceContent(name, type);
+
+  return makeMockSourceAndContent(
+    undefined,
+    `${name}/originalSource-1`,
+    contentType,
+    text
+  );
+}
+
+export function populateOriginalSource(name, type) {
+  const { content, ...source } = getOriginalSourceWithContent(name, type);
+  setSource({
+    id: source.id,
+    text: content.value,
+    contentType: content.contentType,
+    isWasm: false,
+  });
+  return {
+    ...source,
+    content: asyncValue.fulfilled(content),
+  };
+}
diff --git a/devtools/client/debugger/src/workers/parser/tests/mapBindings.spec.js b/devtools/client/debugger/src/workers/parser/tests/mapBindings.spec.js
new file mode 100644
index 0000000000..8c23ab5873
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/mapBindings.spec.js
@@ -0,0 +1,161 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import mapExpressionBindings from "../mapBindings";
+import { parseConsoleScript } from "../utils/ast";
+import cases from "jest-in-case";
+
+const prettier = require("prettier");
+
+function format(code) {
+  return prettier.format(code, { semi: false, parser: "babel" });
+}
+
+function excludedTest({ name, expression, bindings = [] }) {
+  const safeExpression = mapExpressionBindings(
+    expression,
+    parseConsoleScript(expression),
+    bindings
+  );
+  expect(format(safeExpression)).toEqual(format(expression));
+}
+
+function includedTest({ name, expression, newExpression, bindings }) {
+  const safeExpression = mapExpressionBindings(
+    expression,
+    parseConsoleScript(expression),
+    bindings
+  );
+  expect(format(safeExpression)).toEqual(format(newExpression));
+}
+
+describe("mapExpressionBindings", () => {
+  cases("included cases", includedTest, [
+    {
+      name: "single declaration",
+      expression: "const a = 2; let b = 3; var c = 4;",
+      newExpression: "self.a = 2; self.b = 3; self.c = 4;",
+    },
+    {
+      name: "multiple declarations",
+      expression: "const a = 2, b = 3",
+      newExpression: "self.a = 2; self.b = 3",
+    },
+    {
+      name: "declaration with separate assignment",
+      expression: "let a; a = 2;",
+      newExpression: "self.a = void 0; self.a = 2;",
+    },
+    {
+      name: "multiple declarations with no assignment",
+      expression: "let a = 2, b;",
+      newExpression: "self.a = 2; self.b = void 0;",
+    },
+    {
+      name: "local bindings become assignments",
+      bindings: ["a"],
+      expression: "var a = 2;",
+      newExpression: "a = 2;",
+    },
+    {
+      name: "assignments",
+      expression: "a = 2;",
+      newExpression: "self.a = 2;",
+    },
+    {
+      name: "assignments with +=",
+      expression: "a += 2;",
+      newExpression: "self.a += 2;",
+    },
+    {
+      name: "destructuring (objects)",
+      expression: "const { a } = {}; ",
+      newExpression: "({ a: self.a } = {})",
+    },
+    {
+      name: "destructuring (arrays)",
+      expression: " var [a, ...foo] = [];",
+      newExpression: "([self.a, ...self.foo] = [])",
+    },
+    {
+      name: "destructuring (declarations)",
+      expression: "var {d,e} = {}, {f} = {}; ",
+      newExpression: `({ d: self.d, e: self.e } = {});
+        ({ f: self.f } = {})
+      `,
+    },
+    {
+      name: "destructuring & declaration",
+      expression: "const { a } = {}; var b = 3",
+      newExpression: `({ a: self.a } = {});
+        self.b = 3
+      `,
+    },
+    {
+      name: "destructuring assignment",
+      expression: "[a] = [3]",
+      newExpression: "[self.a] = [3]",
+    },
+    {
+      name: "destructuring assignment (declarations)",
+      expression: "[a] = [3]; var b = 4",
+      newExpression: "[self.a] = [3];\n self.b = 4",
+    },
+  ]);
+
+  cases("excluded cases", excludedTest, [
+    { name: "local variables", expression: "function a() { var b = 2}" },
+    { name: "functions", expression: "function a() {}" },
+    { name: "classes", expression: "class a {}" },
+
+    { name: "with", expression: "with (obj) {var a = 2;}" },
+    {
+      name: "with & declaration",
+      expression: "with (obj) {var a = 2;}; ; var b = 3",
+    },
+    {
+      name: "hoisting",
+      expression: "{ const h = 3; }",
+    },
+    {
+      name: "assignments",
+      bindings: ["a"],
+      expression: "a = 2;",
+    },
+    {
+      name: "identifier",
+      expression: "a",
+    },
+  ]);
+
+  cases("cases that we should map in the future", excludedTest, [
+    { name: "blocks (IF)", expression: "if (true) { var a = 3; }" },
+    {
+      name: "hoisting",
+      expression: "{ var g = 5; }",
+    },
+    {
+      name: "for loops bindings",
+      expression: "for (let foo = 4; false;){}",
+    },
+  ]);
+
+  cases("cases that we shouldn't map in the future", includedTest, [
+    {
+      name: "window properties",
+      expression: "var innerHeight = 3; var location = 5;",
+      newExpression: "self.innerHeight = 3; self.location = 5;",
+    },
+    {
+      name: "self declaration",
+      expression: "var self = 3",
+      newExpression: "self.self = 3",
+    },
+    {
+      name: "self assignment",
+      expression: "self = 3",
+      newExpression: "self.self = 3",
+    },
+  ]);
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/mapExpression.spec.js b/devtools/client/debugger/src/workers/parser/tests/mapExpression.spec.js
new file mode 100644
index 0000000000..6c89231012
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/mapExpression.spec.js
@@ -0,0 +1,796 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import mapExpression from "../mapExpression";
+import { format } from "prettier";
+import cases from "jest-in-case";
+
+function test({
+  expression,
+  newExpression,
+  bindings,
+  mappings,
+  shouldMapBindings,
+  expectedMapped,
+  parseExpression = true,
+}) {
+  const res = mapExpression(expression, mappings, bindings, shouldMapBindings);
+
+  if (parseExpression) {
+    expect(
+      format(res.expression, {
+        parser: "babel",
+      })
+    ).toEqual(format(newExpression, { parser: "babel" }));
+  } else {
+    expect(res.expression).toEqual(newExpression);
+  }
+
+  expect(res.mapped).toEqual(expectedMapped);
+}
+
+function formatAwait(body) {
+  return `(async () => { ${body} })();`;
+}
+
+describe("mapExpression", () => {
+  cases("mapExpressions", test, [
+    {
+      name: "await",
+      expression: "await a()",
+      newExpression: formatAwait("return a()"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (multiple statements)",
+      expression: "const x = await a(); x + x",
+      newExpression: formatAwait("self.x = await a(); return x + x;"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (inner)",
+      expression: "async () => await a();",
+      newExpression: "async () => await a();",
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (multiple awaits)",
+      expression: "const x = await a(); await b(x)",
+      newExpression: formatAwait("self.x = await a(); return b(x);"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (assignment)",
+      expression: "let x = await sleep(100, 2)",
+      newExpression: formatAwait("return (self.x = await sleep(100, 2))"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (destructuring)",
+      expression: "const { a, c: y } = await b()",
+      newExpression: formatAwait(
+        "return ({ a: self.a, c: self.y } = await b())"
+      ),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (array destructuring)",
+      expression: "const [a, y] = await b();",
+      newExpression: formatAwait("return ([self.a, self.y] = await b())"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (mixed destructuring)",
+      expression: "const [{ a }] = await b();",
+      newExpression: formatAwait("return ([{ a: self.a }] = await b())"),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (destructuring, multiple statements)",
+      expression: "const { a, c: y } = await b(), { x } = await y()",
+      newExpression: formatAwait(`
+        ({ a: self.a, c: self.y } = await b())
+        return ({ x: self.x } = await y());
+      `),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (destructuring, bindings)",
+      expression: "const { a, c: y } = await b();",
+      newExpression: formatAwait("return ({ a, c: y } = await b())"),
+      bindings: ["a", "y"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (array destructuring, bindings)",
+      expression: "const [a, y] = await b();",
+      newExpression: formatAwait("return ([a, y] = await b())"),
+      bindings: ["a", "y"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (mixed destructuring, bindings)",
+      expression: "const [{ a }] = await b();",
+      newExpression: formatAwait("return ([{ a }] = await b())"),
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (destructuring with defaults, bindings)",
+      expression: "const { c, a = 5 } = await b();",
+      newExpression: formatAwait("return ({ c: self.c, a = 5 } = await b())"),
+      bindings: ["a", "y"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (array destructuring with defaults, bindings)",
+      expression: "const [a, y = 10] = await b();",
+      newExpression: formatAwait("return ([a, y = 10] = await b())"),
+      bindings: ["a", "y"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (mixed destructuring with defaults, bindings)",
+      expression: "const [{ c = 5 }, a = 5] = await b();",
+      newExpression: formatAwait(
+        "return ([ { c: self.c = 5 }, a = 5] = await b())"
+      ),
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (nested destructuring, bindings)",
+      expression: "const { a, c: { y } } = await b();",
+      newExpression: formatAwait(`
+       return ({
+          a,
+          c: { y }
+        } = await b());
+    `),
+      bindings: ["a", "y"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (nested destructuring with defaults)",
+      expression: "const { a, c: { y = 5 } = {} } = await b();",
+      newExpression: formatAwait(`return ({
+        a: self.a,
+        c: { y: self.y = 5 } = {},
+      } = await b());
+    `),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (very nested destructuring with defaults)",
+      expression:
+        "const { a, c: { y: { z = 10, b } = { b: 5 } } } = await b();",
+      newExpression: formatAwait(`
+        return ({
+          a: self.a,
+          c: {
+            y: { z: self.z = 10, b: self.b } = {
+              b: 5
+            }
+          }
+        } = await b());
+    `),
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (with SyntaxError)",
+      expression: "await new Promise())",
+      newExpression: formatAwait("await new Promise())"),
+      parseExpression: false,
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, let assignment)",
+      expression: "let a = await 123;",
+      newExpression: `let a;
+        (async () => {
+          return a = await 123;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, var assignment)",
+      expression: "var a = await 123;",
+      newExpression: `var a;
+        (async () => {
+          return a = await 123;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, const assignment)",
+      expression: "const a = await 123;",
+      newExpression: `let a;
+        (async () => {
+          return a = await 123;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, multiple assignments)",
+      expression: "let a = 1, b, c = 3; b = await 123; a + b + c",
+      newExpression: `let a, b, c;
+        (async () => {
+          a = 1;
+          c = 3;
+          b = await 123;
+          return a + b + c;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, object destructuring)",
+      expression: "let {a, b, c} = await x;",
+      newExpression: `let a, b, c;
+        (async () => {
+          return ({a, b, c} = await x);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, object destructuring with rest)",
+      expression: "let {a, ...rest} = await x;",
+      newExpression: `let a, rest;
+        (async () => {
+          return ({a, ...rest} = await x);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, object destructuring with renaming and default)",
+      expression: "let {a: hello, b, c: world, d: $ = 4} = await x;",
+      newExpression: `let hello, b, world, $;
+        (async () => {
+          return ({a: hello, b, c: world, d: $ = 4} = await x);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, nested object destructuring + renaming + default)",
+      expression: `let {
+          a: hello, c: { y: { z = 10, b: bill, d: [e, f = 20] }}
+        } = await x; z;`,
+      newExpression: `let hello, z, bill, e, f;
+        (async () => {
+          ({ a: hello, c: { y: { z = 10, b: bill, d: [e, f = 20] }}} = await x);
+          return z;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, array destructuring)",
+      expression: "let [a, b, c] = await x; c;",
+      newExpression: `let a, b, c;
+        (async () => {
+          [a, b, c] = await x;
+          return c;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, array destructuring with default)",
+      expression: "let [a, b = 1, c = 2] = await x; c;",
+      newExpression: `let a, b, c;
+        (async () => {
+          [a, b = 1, c = 2] = await x;
+          return c;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, array destructuring with default and rest)",
+      expression: "let [a, b = 1, c = 2, ...rest] = await x; rest;",
+      newExpression: `let a, b, c, rest;
+        (async () => {
+          [a, b = 1, c = 2, ...rest] = await x;
+          return rest;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, nested array destructuring with default)",
+      expression: "let [a, b = 1, [c = 2, [d = 3, e = 4]]] = await x; c;",
+      newExpression: `let a, b, c, d, e;
+        (async () => {
+          [a, b = 1, [c = 2, [d = 3, e = 4]]] = await x;
+          return c;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (no bindings, dynamic import)",
+      expression: `
+        var {rainbowLog} = await import("./cool-module.js");
+        rainbowLog("dynamic");`,
+      newExpression: `var rainbowLog;
+        (async () => {
+          ({rainbowLog} = await import("./cool-module.js"));
+          return rainbowLog("dynamic");
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (nullish coalesce operator)",
+      expression: "await x; true ?? false",
+      newExpression: `(async () => {
+          await x;
+          return true ?? false;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (optional chaining operator)",
+      expression: "await x; x?.y?.z",
+      newExpression: `(async () => {
+          await x;
+          return x?.y?.z;
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (async function declaration with nullish coalesce operator)",
+      expression: "async function coalesce(x) { await x; return x ?? false; }",
+      newExpression:
+        "async function coalesce(x) { await x; return x ?? false; }",
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (async function declaration with optional chaining operator)",
+      expression: "async function chain(x) { await x; return x?.y?.z; }",
+      newExpression: "async function chain(x) { await x; return x?.y?.z; }",
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      // check that variable declaration in for loop is not put outside of the async iife
+      name: "await (for loop)",
+      expression: "for (let i=0;i<2;i++) {}; var b = await 1;",
+      newExpression: `var b;
+        (async () => {
+          for (let i=0;i<2;i++) {}
+          return (b = await 1);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      // check that variable declaration in for-in loop is not put outside of the async iife
+      name: "await (for..in loop)",
+      expression: "for (let i in {}) {}; var b = await 1;",
+      newExpression: `var b;
+        (async () => {
+          for (let i in {}) {}
+          return (b = await 1);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      // check that variable declaration in for-of loop is not put outside of the async iife
+      name: "await (for..of loop)",
+      expression: "for (let i of []) {}; var b = await 1;",
+      newExpression: `var b;
+        (async () => {
+          for (let i of []) {}
+          return (b = await 1);
+        })()`,
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (if condition)",
+      expression: "if (await true) console.log(1);",
+      newExpression: formatAwait("if (await true) console.log(1);"),
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "await (non-expression final statement: bug 1851759)",
+      expression: `j = { "foo": 1, "bar": 2 }; await 42; for (var k in j) { console.log(k); }`,
+      newExpression: formatAwait(`
+        j = {
+          foo: 1,
+          bar: 2,
+        };
+        await 42;
+        for (var k in j) {
+          console.log(k);
+        }`),
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: true,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "simple",
+      expression: "a",
+      newExpression: "a",
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "mappings",
+      expression: "a",
+      newExpression: "_a",
+      bindings: [],
+      mappings: {
+        a: "_a",
+      },
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: true,
+      },
+    },
+    {
+      name: "declaration",
+      expression: "var a = 3;",
+      newExpression: "self.a = 3",
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "declaration + destructuring",
+      expression: "var { a } = { a: 3 };",
+      newExpression: "({ a: self.a } = {\n a: 3 \n})",
+      bindings: [],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings",
+      expression: "var a = 3;",
+      newExpression: "a = 3",
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings + destructuring",
+      expression: "var { a } = { a: 3 };",
+      newExpression: "({ a } = { \n a: 3 \n })",
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings + destructuring + rest",
+      expression: "var { a, ...foo } = {}",
+      newExpression: "({ a, ...self.foo } = {})",
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings + array destructuring + rest",
+      expression: "var [a, ...foo] = []",
+      newExpression: "([a, ...self.foo] = [])",
+      bindings: ["a"],
+      mappings: {},
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings + mappings",
+      expression: "a = 3;",
+      newExpression: "self.a = 3",
+      bindings: ["_a"],
+      mappings: { a: "_a" },
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings + mappings + destructuring",
+      expression: "var { a } = { a: 4 }",
+      newExpression: "({ a: self.a } = {\n a: 4 \n})",
+      bindings: ["_a"],
+      mappings: { a: "_a" },
+      shouldMapBindings: true,
+      expectedMapped: {
+        await: false,
+        bindings: true,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "bindings without mappings",
+      expression: "a = 3;",
+      newExpression: "a = 3",
+      bindings: [],
+      mappings: { a: "_a" },
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: false,
+      },
+    },
+    {
+      name: "object destructuring + bindings without mappings",
+      expression: "({ a } = {});",
+      newExpression: "({ a: _a } = {})",
+      bindings: [],
+      mappings: { a: "_a" },
+      shouldMapBindings: false,
+      expectedMapped: {
+        await: false,
+        bindings: false,
+        originalExpression: true,
+      },
+    },
+  ]);
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/mapOriginalExpression.spec.js b/devtools/client/debugger/src/workers/parser/tests/mapOriginalExpression.spec.js
new file mode 100644
index 0000000000..4949d65cd9
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/mapOriginalExpression.spec.js
@@ -0,0 +1,93 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import mapExpression from "../mapExpression";
+import { format } from "prettier";
+
+const formatOutput = output =>
+  format(output, {
+    parser: "babel",
+  });
+
+const mapOriginalExpression = (expression, mappings) =>
+  mapExpression(expression, mappings, [], false, false).expression;
+
+describe("mapOriginalExpression", () => {
+  it("simple", () => {
+    const generatedExpression = mapOriginalExpression("a + b;", {
+      a: "foo",
+      b: "bar",
+    });
+    expect(generatedExpression).toEqual("foo + bar;");
+  });
+
+  it("this", () => {
+    const generatedExpression = mapOriginalExpression("this.prop;", {
+      this: "_this",
+    });
+    expect(generatedExpression).toEqual("_this.prop;");
+  });
+
+  it("member expressions", () => {
+    const generatedExpression = mapOriginalExpression("a + b", {
+      a: "_mod.foo",
+      b: "_mod.bar",
+    });
+    expect(generatedExpression).toEqual("_mod.foo + _mod.bar;");
+  });
+
+  it("block", () => {
+    // todo: maybe wrap with parens ()
+    const generatedExpression = mapOriginalExpression("{a}", {
+      a: "_mod.foo",
+      b: "_mod.bar",
+    });
+    expect(generatedExpression).toEqual("{\n  _mod.foo;\n}");
+  });
+
+  it("skips codegen with no mappings", () => {
+    const generatedExpression = mapOriginalExpression("a + b", {
+      a: "a",
+      c: "_c",
+    });
+    expect(generatedExpression).toEqual("a + b");
+  });
+
+  it("object destructuring", () => {
+    const generatedExpression = mapOriginalExpression("({ a } = { a: 4 })", {
+      a: "_mod.foo",
+    });
+
+    expect(formatOutput(generatedExpression)).toEqual(
+      formatOutput("({ a: _mod.foo } = {\n a: 4 \n})")
+    );
+  });
+
+  it("nested object destructuring", () => {
+    const generatedExpression = mapOriginalExpression(
+      "({ a: { b, c } } = { a: 4 })",
+      {
+        a: "_mod.foo",
+        b: "_mod.bar",
+      }
+    );
+
+    expect(formatOutput(generatedExpression)).toEqual(
+      formatOutput("({ a: { b: _mod.bar, c } } = {\n a: 4 \n})")
+    );
+  });
+
+  it("shadowed bindings", () => {
+    const generatedExpression = mapOriginalExpression(
+      "window.thing = function fn(){ var a; a; b; }; a; b; ",
+      {
+        a: "_a",
+        b: "_b",
+      }
+    );
+    expect(generatedExpression).toEqual(
+      "window.thing = function fn() {\n  var a;\n  a;\n  _b;\n};\n_a;\n_b;"
+    );
+  });
+});
diff --git a/devtools/client/debugger/src/workers/parser/tests/sources.spec.js b/devtools/client/debugger/src/workers/parser/tests/sources.spec.js
new file mode 100644
index 0000000000..e84ae4ad22
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/tests/sources.spec.js
@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getSource } from "../sources";
+
+describe("sources", () => {
+  it("fail getSource", () => {
+    const sourceId = "some.nonexistent.source.id";
+    expect(() => {
+      getSource(sourceId);
+    }).toThrow();
+  });
+});
diff --git a/devtools/client/debugger/src/workers/parser/utils/ast.js b/devtools/client/debugger/src/workers/parser/utils/ast.js
new file mode 100644
index 0000000000..445645c12f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/ast.js
@@ -0,0 +1,230 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { parseScriptTags } from "./parse-script-tags";
+import * as babelParser from "@babel/parser";
+import * as t from "@babel/types";
+import { getSource } from "../sources";
+
+const ASTs = new Map();
+
+function _parse(code, opts) {
+  return babelParser.parse(code, {
+    ...opts,
+    tokens: true,
+  });
+}
+
+const sourceOptions = {
+  generated: {
+    sourceType: "unambiguous",
+    tokens: true,
+    plugins: [
+      "classStaticBlock",
+      "classPrivateProperties",
+      "classPrivateMethods",
+      "classProperties",
+      "objectRestSpread",
+      "optionalChaining",
+      "privateIn",
+      "nullishCoalescingOperator",
+      "regexpUnicodeSets",
+    ],
+  },
+  original: {
+    sourceType: "unambiguous",
+    tokens: true,
+    plugins: [
+      "jsx",
+      "flow",
+      "doExpressions",
+      "optionalChaining",
+      "nullishCoalescingOperator",
+      "decorators-legacy",
+      "objectRestSpread",
+      "classStaticBlock",
+      "classPrivateProperties",
+      "classPrivateMethods",
+      "classProperties",
+      "exportDefaultFrom",
+      "exportNamespaceFrom",
+      "asyncGenerators",
+      "functionBind",
+      "functionSent",
+      "dynamicImport",
+      "react-jsx",
+      "regexpUnicodeSets",
+    ],
+  },
+};
+
+export function parse(text, opts) {
+  let ast = {};
+  if (!text) {
+    return ast;
+  }
+
+  try {
+    ast = _parse(text, opts);
+  } catch (error) {
+    console.error(error);
+  }
+
+  return ast;
+}
+
+// Custom parser for parse-script-tags that adapts its input structure to
+// our parser's signature
+function htmlParser({ source, line }) {
+  return parse(source, { startLine: line, ...sourceOptions.generated });
+}
+
+const VUE_COMPONENT_START = /^\s*</;
+function vueParser({ source, line }) {
+  return parse(source, {
+    startLine: line,
+    ...sourceOptions.original,
+  });
+}
+function parseVueScript(code) {
+  if (typeof code !== "string") {
+    return {};
+  }
+
+  let ast;
+
+  // .vue files go through several passes, so while there is a
+  // single-file-component Vue template, there are also generally .vue files
+  // that are still just JS as well.
+  if (code.match(VUE_COMPONENT_START)) {
+    ast = parseScriptTags(code, vueParser);
+    if (t.isFile(ast)) {
+      // parseScriptTags is currently hard-coded to return scripts, but Vue
+      // always expects ESM syntax, so we just hard-code it.
+      ast.program.sourceType = "module";
+    }
+  } else {
+    ast = parse(code, sourceOptions.original);
+  }
+  return ast;
+}
+
+export function parseConsoleScript(text, opts) {
+  try {
+    return _parse(text, {
+      plugins: [
+        "classStaticBlock",
+        "classPrivateProperties",
+        "classPrivateMethods",
+        "objectRestSpread",
+        "dynamicImport",
+        "nullishCoalescingOperator",
+        "optionalChaining",
+        "regexpUnicodeSets",
+      ],
+      ...opts,
+      allowAwaitOutsideFunction: true,
+    });
+  } catch (e) {
+    return null;
+  }
+}
+
+export function parseScript(text, opts) {
+  return _parse(text, opts);
+}
+
+export function getAst(sourceId) {
+  if (ASTs.has(sourceId)) {
+    return ASTs.get(sourceId);
+  }
+
+  const source = getSource(sourceId);
+
+  if (source.isWasm) {
+    return null;
+  }
+
+  let ast = {};
+  const { contentType } = source;
+  if (contentType == "text/html") {
+    ast = parseScriptTags(source.text, htmlParser) || {};
+  } else if (contentType && contentType === "text/vue") {
+    ast = parseVueScript(source.text) || {};
+  } else if (
+    contentType &&
+    contentType.match(/(javascript|jsx)/) &&
+    !contentType.match(/typescript-jsx/)
+  ) {
+    const type = source.id.includes("original") ? "original" : "generated";
+    const options = sourceOptions[type];
+    ast = parse(source.text, options);
+  } else if (contentType && contentType.match(/typescript/)) {
+    const options = {
+      ...sourceOptions.original,
+      plugins: [
+        ...sourceOptions.original.plugins.filter(
+          p =>
+            p !== "flow" &&
+            p !== "decorators" &&
+            p !== "decorators2" &&
+            (p !== "jsx" || contentType.match(/typescript-jsx/))
+        ),
+        "decorators-legacy",
+        "typescript",
+      ],
+    };
+    ast = parse(source.text, options);
+  }
+
+  ASTs.set(source.id, ast);
+  return ast;
+}
+
+export function clearASTs(sourceIds) {
+  for (const sourceId of sourceIds) {
+    ASTs.delete(sourceId);
+  }
+}
+
+export function traverseAst(sourceId, visitor, state) {
+  const ast = getAst(sourceId);
+  if (!ast || !Object.keys(ast).length) {
+    return null;
+  }
+
+  t.traverse(ast, visitor, state);
+  return ast;
+}
+
+export function hasNode(rootNode, predicate) {
+  try {
+    t.traverse(rootNode, {
+      enter: (node, ancestors) => {
+        if (predicate(node, ancestors)) {
+          throw new Error("MATCH");
+        }
+      },
+    });
+  } catch (e) {
+    if (e.message === "MATCH") {
+      return true;
+    }
+  }
+  return false;
+}
+
+export function replaceNode(ancestors, node) {
+  const parent = ancestors[ancestors.length - 1];
+
+  if (typeof parent.index === "number") {
+    if (Array.isArray(node)) {
+      parent.node[parent.key].splice(parent.index, 1, ...node);
+    } else {
+      parent.node[parent.key][parent.index] = node;
+    }
+  } else {
+    parent.node[parent.key] = node;
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/contains.js b/devtools/client/debugger/src/workers/parser/utils/contains.js
new file mode 100644
index 0000000000..ed4cb31c1d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/contains.js
@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+function startsBefore(a, b) {
+  let before = a.start.line < b.line;
+  if (a.start.line === b.line) {
+    before =
+      a.start.column >= 0 && b.column >= 0 ? a.start.column <= b.column : true;
+  }
+  return before;
+}
+
+function endsAfter(a, b) {
+  let after = a.end.line > b.line;
+  if (a.end.line === b.line) {
+    after =
+      a.end.column >= 0 && b.column >= 0 ? a.end.column >= b.column : true;
+  }
+  return after;
+}
+
+export function containsPosition(a, b) {
+  return startsBefore(a, b) && endsAfter(a, b);
+}
+
+export function containsLocation(a, b) {
+  return containsPosition(a, b.start) && containsPosition(a, b.end);
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/formatSymbols.js b/devtools/client/debugger/src/workers/parser/utils/formatSymbols.js
new file mode 100644
index 0000000000..3bcf37e7c4
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/formatSymbols.js
@@ -0,0 +1,65 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getSymbols } from "../getSymbols";
+
+function formatLocation(loc) {
+  if (!loc) {
+    return "";
+  }
+
+  const { start, end } = loc;
+  const startLoc = `(${start.line}, ${start.column})`;
+  const endLoc = `(${end.line}, ${end.column})`;
+
+  return `[${startLoc}, ${endLoc}]`;
+}
+
+function summarize(symbol) {
+  if (typeof symbol == "boolean") {
+    return symbol ? "true" : "false";
+  }
+
+  const loc = formatLocation(symbol.location);
+  const params = symbol.parameterNames
+    ? `(${symbol.parameterNames.join(", ")})`
+    : "";
+  const expression = symbol.expression || "";
+  const klass = symbol.klass || "";
+  const name = symbol.name == undefined ? "" : symbol.name;
+  const names = symbol.specifiers ? symbol.specifiers.join(", ") : "";
+  const values = symbol.values ? symbol.values.join(", ") : "";
+  const index = symbol.index ? symbol.index : "";
+
+  return `${loc} ${expression} ${name}${params} ${klass} ${names} ${values} ${index}`.trim(); // eslint-disable-line max-len
+}
+const bools = ["hasJsx", "hasTypes"];
+const strings = ["framework"];
+function formatBool(name, symbols) {
+  return `${name}: ${symbols[name] ? "true" : "false"}`;
+}
+
+function formatString(name, symbols) {
+  return `${name}: ${symbols[name]}`;
+}
+
+function formatKey(name, symbols) {
+  if (bools.includes(name)) {
+    return formatBool(name, symbols);
+  }
+
+  if (strings.includes(name)) {
+    return formatString(name, symbols);
+  }
+
+  return `${name}:\n${symbols[name].map(summarize).join("\n")}`;
+}
+
+export function formatSymbols(sourceId) {
+  const symbols = getSymbols(sourceId);
+
+  return Object.keys(symbols)
+    .map(name => formatKey(name, symbols))
+    .join("\n\n");
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/getFunctionName.js b/devtools/client/debugger/src/workers/parser/utils/getFunctionName.js
new file mode 100644
index 0000000000..1fe85a5c69
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/getFunctionName.js
@@ -0,0 +1,96 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+
+// Perform ES6's anonymous function name inference for all
+// locations where static analysis is possible.
+// eslint-disable-next-line complexity
+export default function getFunctionName(node, parent) {
+  if (t.isIdentifier(node.id)) {
+    return node.id.name;
+  }
+
+  if (
+    t.isObjectMethod(node, { computed: false }) ||
+    t.isClassMethod(node, { computed: false }) ||
+    t.isClassPrivateMethod(node)
+  ) {
+    const { key } = node;
+
+    if (t.isIdentifier(key)) {
+      return key.name;
+    }
+    if (t.isStringLiteral(key)) {
+      return key.value;
+    }
+    if (t.isNumericLiteral(key)) {
+      return `${key.value}`;
+    }
+
+    if (t.isPrivateName(key)) {
+      return `#${key.id.name}`;
+    }
+  }
+
+  if (
+    t.isObjectProperty(parent, { computed: false, value: node }) ||
+    // TODO: Babylon 6 doesn't support computed class props. It is included
+    // here so that it is most flexible. Once Babylon 7 is used, this
+    // can change to use computed: false like ObjectProperty.
+    (t.isClassProperty(parent, { value: node }) && !parent.computed) ||
+    (t.isClassPrivateProperty(parent, { value: node }) && !parent.computed)
+  ) {
+    const { key } = parent;
+
+    if (t.isIdentifier(key)) {
+      return key.name;
+    }
+    if (t.isStringLiteral(key)) {
+      return key.value;
+    }
+    if (t.isNumericLiteral(key)) {
+      return `${key.value}`;
+    }
+
+    if (t.isPrivateName(key)) {
+      return `#${key.id.name}`;
+    }
+  }
+
+  if (t.isAssignmentExpression(parent, { operator: "=", right: node })) {
+    if (t.isIdentifier(parent.left)) {
+      return parent.left.name;
+    }
+
+    // This case is not supported in standard ES6 name inference, but it
+    // is included here since it is still a helpful case during debugging.
+    if (t.isMemberExpression(parent.left, { computed: false })) {
+      return parent.left.property.name;
+    }
+  }
+
+  if (
+    t.isAssignmentPattern(parent, { right: node }) &&
+    t.isIdentifier(parent.left)
+  ) {
+    return parent.left.name;
+  }
+
+  if (
+    t.isVariableDeclarator(parent, { init: node }) &&
+    t.isIdentifier(parent.id)
+  ) {
+    return parent.id.name;
+  }
+
+  if (
+    t.isExportDefaultDeclaration(parent, { declaration: node }) &&
+    t.isFunctionDeclaration(node)
+  ) {
+    return "default";
+  }
+
+  return "anonymous";
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/helpers.js b/devtools/client/debugger/src/workers/parser/utils/helpers.js
new file mode 100644
index 0000000000..0045b54136
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/helpers.js
@@ -0,0 +1,232 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+import generate from "@babel/generator";
+
+export function isFunction(node) {
+  return (
+    t.isFunction(node) ||
+    t.isArrowFunctionExpression(node) ||
+    t.isObjectMethod(node) ||
+    t.isClassMethod(node)
+  );
+}
+
+export function isAwaitExpression(path) {
+  const { node, parent } = path;
+  return (
+    t.isAwaitExpression(node) ||
+    t.isAwaitExpression(parent.init) ||
+    t.isAwaitExpression(parent)
+  );
+}
+
+export function isYieldExpression(path) {
+  const { node, parent } = path;
+  return (
+    t.isYieldExpression(node) ||
+    t.isYieldExpression(parent.init) ||
+    t.isYieldExpression(parent)
+  );
+}
+
+export function isObjectShorthand(parent) {
+  if (!t.isObjectProperty(parent)) {
+    return false;
+  }
+
+  if (parent.value && parent.value.left) {
+    return (
+      parent.value.type === "AssignmentPattern" &&
+      parent.value.left.type === "Identifier"
+    );
+  }
+
+  return (
+    parent.value &&
+    parent.key.start == parent.value.start &&
+    parent.key.loc.identifierName === parent.value.loc.identifierName
+  );
+}
+
+export function getObjectExpressionValue(node) {
+  const { value } = node;
+
+  if (t.isIdentifier(value)) {
+    return value.name;
+  }
+
+  if (t.isCallExpression(value) || t.isFunctionExpression(value)) {
+    return "";
+  }
+  const code = generate(value).code;
+
+  const shouldWrap = t.isObjectExpression(value);
+  return shouldWrap ? `(${code})` : code;
+}
+
+export function getCode(node) {
+  return generate(node).code;
+}
+
+export function getComments(ast) {
+  if (!ast || !ast.comments) {
+    return [];
+  }
+  return ast.comments.map(comment => ({
+    name: comment.location,
+    location: comment.loc,
+  }));
+}
+
+export function isComputedExpression(expression) {
+  return /^\[/m.test(expression);
+}
+
+export function getMemberExpression(root) {
+  function _getMemberExpression(node, expr) {
+    if (t.isMemberExpression(node)) {
+      expr = [node.property.name].concat(expr);
+      return _getMemberExpression(node.object, expr);
+    }
+
+    if (t.isCallExpression(node)) {
+      return [];
+    }
+
+    if (t.isThisExpression(node)) {
+      return ["this"].concat(expr);
+    }
+
+    return [node.name].concat(expr);
+  }
+
+  const expr = _getMemberExpression(root, []);
+  return expr.join(".");
+}
+
+export function getVariables(dec) {
+  if (!dec.id) {
+    return [];
+  }
+
+  if (t.isArrayPattern(dec.id)) {
+    if (!dec.id.elements) {
+      return [];
+    }
+
+    // NOTE: it's possible that an element is empty or has several variables
+    // e.g. const [, a] = arr
+    // e.g. const [{a, b }] = 2
+    return dec.id.elements
+      .filter(Boolean)
+      .map(element => ({
+        name: t.isAssignmentPattern(element)
+          ? element.left.name
+          : element.name || element.argument?.name,
+        location: element.loc,
+      }))
+      .filter(({ name }) => name);
+  }
+
+  return [
+    {
+      name: dec.id.name,
+      location: dec.loc,
+    },
+  ];
+}
+
+/**
+ * Add the identifiers for a given object pattern.
+ *
+ * @param {Array.<Object>} identifiers
+ *        the current list of identifiers where to push the new identifiers
+ *        related to this path.
+ * @param {Set<String>} identifiersKeys
+ *        List of currently registered identifier location key.
+ * @param {Object} pattern
+ */
+export function addPatternIdentifiers(identifiers, identifiersKeys, pattern) {
+  let items;
+  if (t.isObjectPattern(pattern)) {
+    items = pattern.properties.map(({ value }) => value);
+  }
+
+  if (t.isArrayPattern(pattern)) {
+    items = pattern.elements;
+  }
+
+  if (items) {
+    addIdentifiers(identifiers, identifiersKeys, items);
+  }
+}
+
+function addIdentifiers(identifiers, identifiersKeys, items) {
+  for (const item of items) {
+    if (t.isObjectPattern(item) || t.isArrayPattern(item)) {
+      addPatternIdentifiers(identifiers, identifiersKeys, item);
+    } else if (t.isIdentifier(item)) {
+      if (!identifiersKeys.has(nodeLocationKey(item.loc))) {
+        identifiers.push({
+          name: item.name,
+          expression: item.name,
+          location: item.loc,
+        });
+      }
+    }
+  }
+}
+
+// Top Level checks the number of "body" nodes in the ancestor chain
+// if the node is top-level, then it shoul only have one body.
+export function isTopLevel(ancestors) {
+  return ancestors.filter(ancestor => ancestor.key == "body").length == 1;
+}
+
+export function nodeLocationKey({ start, end }) {
+  return `${start.line}:${start.column}:${end.line}:${end.column}`;
+}
+
+export function getFunctionParameterNames(path) {
+  if (path.node.params != null) {
+    return path.node.params.map(param => {
+      if (param.type !== "AssignmentPattern") {
+        return param.name;
+      }
+
+      // Parameter with default value
+      if (
+        param.left.type === "Identifier" &&
+        param.right.type === "Identifier"
+      ) {
+        return `${param.left.name} = ${param.right.name}`;
+      } else if (
+        param.left.type === "Identifier" &&
+        param.right.type === "StringLiteral"
+      ) {
+        return `${param.left.name} = ${param.right.value}`;
+      } else if (
+        param.left.type === "Identifier" &&
+        param.right.type === "ObjectExpression"
+      ) {
+        return `${param.left.name} = {}`;
+      } else if (
+        param.left.type === "Identifier" &&
+        param.right.type === "ArrayExpression"
+      ) {
+        return `${param.left.name} = []`;
+      } else if (
+        param.left.type === "Identifier" &&
+        param.right.type === "NullLiteral"
+      ) {
+        return `${param.left.name} = null`;
+      }
+
+      return null;
+    });
+  }
+  return [];
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/inferClassName.js b/devtools/client/debugger/src/workers/parser/utils/inferClassName.js
new file mode 100644
index 0000000000..09d25f275d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/inferClassName.js
@@ -0,0 +1,93 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import * as t from "@babel/types";
+
+// the function class is inferred from a call like
+// createClass or extend
+function fromCallExpression(callExpression) {
+  const allowlist = ["extend", "createClass"];
+  const { callee } = callExpression.node;
+  if (!callee) {
+    return null;
+  }
+
+  const name = t.isMemberExpression(callee)
+    ? callee.property.name
+    : callee.name;
+
+  if (!allowlist.includes(name)) {
+    return null;
+  }
+
+  const variable = callExpression.findParent(p =>
+    t.isVariableDeclarator(p.node)
+  );
+  if (variable) {
+    return variable.node.id.name;
+  }
+
+  const assignment = callExpression.findParent(p =>
+    t.isAssignmentExpression(p.node)
+  );
+
+  if (!assignment) {
+    return null;
+  }
+
+  const { left } = assignment.node;
+
+  if (left.name) {
+    return name;
+  }
+
+  if (t.isMemberExpression(left)) {
+    return left.property.name;
+  }
+
+  return null;
+}
+
+// the function class is inferred from a prototype assignment
+// e.g. TodoClass.prototype.render = function() {}
+function fromPrototype(assignment) {
+  const { left } = assignment.node;
+  if (!left) {
+    return null;
+  }
+
+  if (
+    t.isMemberExpression(left) &&
+    left.object &&
+    t.isMemberExpression(left.object) &&
+    left.object.property.identifier === "prototype"
+  ) {
+    return left.object.object.name;
+  }
+
+  return null;
+}
+
+// infer class finds an appropriate class for functions
+// that are defined inside of a class like thing.
+// e.g. `class Foo`, `TodoClass.prototype.foo`,
+//      `Todo = createClass({ foo: () => {}})`
+export function inferClassName(path) {
+  const classDeclaration = path.findParent(p => t.isClassDeclaration(p.node));
+  if (classDeclaration) {
+    return classDeclaration.node.id.name;
+  }
+
+  const callExpression = path.findParent(p => t.isCallExpression(p.node));
+  if (callExpression) {
+    return fromCallExpression(callExpression);
+  }
+
+  const assignment = path.findParent(p => t.isAssignmentExpression(p.node));
+  if (assignment) {
+    return fromPrototype(assignment);
+  }
+
+  return null;
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/customParse.js b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/customParse.js
new file mode 100644
index 0000000000..5c7fed480d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/customParse.js
@@ -0,0 +1,132 @@
+/**
+ *  https://github.com/ryanjduffy/parse-script-tags
+ *
+ * Copyright (c) by Ryan Duff
+ * Licensed under the MIT License.
+ */
+
+import * as types from "@babel/types";
+
+import parseFragment from "./parseScriptFragment.js";
+
+const startScript = /<script[^>]*>/im;
+const endScript = /<\/script\s*>/im;
+// https://stackoverflow.com/questions/5034781/js-regex-to-split-by-line#comment5633979_5035005
+const newLines = /\r\n|[\n\v\f\r\x85\u2028\u2029]/;
+
+function getType(tag) {
+  const fragment = parseFragment(tag);
+
+  if (fragment) {
+    const type = fragment.attributes.type;
+
+    return type ? type.toLowerCase() : null;
+  }
+
+  return null;
+}
+
+function getCandidateScriptLocations(source, index) {
+  const i = index || 0;
+  const str = source.substring(i);
+
+  const startMatch = startScript.exec(str);
+  if (startMatch) {
+    const startsAt = startMatch.index + startMatch[0].length;
+    const afterStart = str.substring(startsAt);
+    const endMatch = endScript.exec(afterStart);
+    if (endMatch) {
+      const locLength = endMatch.index;
+      const locIndex = i + startsAt;
+      const endIndex = locIndex + locLength + endMatch[0].length;
+
+      // extract the complete tag (incl start and end tags and content). if the
+      // type is invalid (= not JS), skip this tag and continue
+      const tag = source.substring(i + startMatch.index, endIndex);
+      const type = getType(tag);
+      if (
+        type &&
+        type !== "javascript" &&
+        type !== "text/javascript" &&
+        type !== "module"
+      ) {
+        return getCandidateScriptLocations(source, endIndex);
+      }
+
+      return [
+        adjustForLineAndColumn(source, {
+          index: locIndex,
+          length: locLength,
+          source: source.substring(locIndex, locIndex + locLength),
+        }),
+        ...getCandidateScriptLocations(source, endIndex),
+      ];
+    }
+  }
+
+  return [];
+}
+
+function parseScripts(locations, parser) {
+  return locations.map(parser);
+}
+
+function calcLineAndColumn(source, index) {
+  const lines = source.substring(0, index).split(newLines);
+  const line = lines.length;
+  const column = lines.pop().length + 1;
+
+  return {
+    column,
+    line,
+  };
+}
+
+function adjustForLineAndColumn(fullSource, location) {
+  const { column, line } = calcLineAndColumn(fullSource, location.index);
+  return Object.assign({}, location, {
+    line,
+    column,
+    // prepend whitespace for scripts that do not start on the first column
+    // NOTE: `column` is 1-based
+    source: " ".repeat(column - 1) + location.source,
+  });
+}
+
+function parseScriptTags(source, parser) {
+  const scripts = parseScripts(getCandidateScriptLocations(source), parser)
+    .filter(types.isFile)
+    .reduce(
+      (main, script) => {
+        return {
+          statements: main.statements.concat(script.program.body),
+          comments: main.comments.concat(script.comments),
+          tokens: main.tokens.concat(script.tokens),
+        };
+      },
+      {
+        statements: [],
+        comments: [],
+        tokens: [],
+      }
+    );
+
+  const program = types.program(scripts.statements);
+  const file = types.file(program, scripts.comments, scripts.tokens);
+
+  const end = calcLineAndColumn(source, source.length);
+  file.start = program.start = 0;
+  file.end = program.end = source.length;
+  file.loc = program.loc = {
+    start: {
+      line: 1,
+      column: 0,
+    },
+    end,
+  };
+
+  return file;
+}
+
+export default parseScriptTags;
+export { getCandidateScriptLocations, parseScripts, parseScriptTags };
diff --git a/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/index.js b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/index.js
new file mode 100644
index 0000000000..e85d0cdc53
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/index.js
@@ -0,0 +1,60 @@
+/**
+ *  https://github.com/ryanjduffy/parse-script-tags
+ *
+ * Copyright (c) by Ryan Duff
+ * Licensed under the MIT License.
+ */
+
+import * as types from "@babel/types";
+import * as babelParser from "@babel/parser";
+
+import {
+  getCandidateScriptLocations,
+  parseScripts as customParseScripts,
+  parseScriptTags as customParseScriptTags,
+} from "./customParse.js";
+
+function parseScript({ source, line }) {
+  // remove empty or only whitespace scripts
+  if (source.length === 0 || /^\s+$/.test(source)) {
+    return null;
+  }
+
+  try {
+    return babelParser.parse(source, {
+      sourceType: "script",
+      startLine: line,
+    });
+  } catch (e) {
+    return null;
+  }
+}
+
+function parseScripts(locations, parser = parseScript) {
+  return customParseScripts(locations, parser);
+}
+
+function extractScriptTags(source) {
+  return parseScripts(getCandidateScriptLocations(source), loc => {
+    const ast = parseScript(loc);
+
+    if (ast) {
+      return loc;
+    }
+
+    return null;
+  }).filter(types.isFile);
+}
+
+function parseScriptTags(source, parser = parseScript) {
+  return customParseScriptTags(source, parser);
+}
+
+export default parseScriptTags;
+export {
+  extractScriptTags,
+  getCandidateScriptLocations,
+  parseScript,
+  parseScripts,
+  parseScriptTags,
+};
diff --git a/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/parseScriptFragment.js b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/parseScriptFragment.js
new file mode 100644
index 0000000000..11dfe4dc1b
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/parse-script-tags/parseScriptFragment.js
@@ -0,0 +1,155 @@
+/**
+ *  https://github.com/ryanjduffy/parse-script-tags
+ *
+ * Copyright (c) by Ryan Duff
+ * Licensed under the MIT License.
+ */
+
+const alphanum = /[a-z0-9\-]/i;
+
+function parseToken(str, start) {
+  let i = start;
+  while (i < str.length && alphanum.test(str.charAt(i++))) {
+    continue;
+  }
+
+  if (i !== start) {
+    return {
+      token: str.substring(start, i - 1),
+      index: i,
+    };
+  }
+
+  return null;
+}
+
+function parseAttributes(str, start) {
+  let i = start;
+  const attributes = {};
+  let attribute = null;
+
+  while (i < str.length) {
+    const c = str.charAt(i);
+
+    if (attribute === null && c == ">") {
+      break;
+    } else if (attribute === null && alphanum.test(c)) {
+      attribute = {
+        name: null,
+        value: true,
+        bool: true,
+        terminator: null,
+      };
+
+      const attributeNameNode = parseToken(str, i);
+      if (attributeNameNode) {
+        attribute.name = attributeNameNode.token;
+        i = attributeNameNode.index - 2;
+      }
+    } else if (attribute !== null) {
+      if (c === "=") {
+        // once we've started an attribute, look for = to indicate
+        // it's a non-boolean attribute
+        attribute.bool = false;
+        if (attribute.value === true) {
+          attribute.value = "";
+        }
+      } else if (
+        !attribute.bool &&
+        attribute.terminator === null &&
+        (c === '"' || c === "'")
+      ) {
+        // once we've determined it's non-boolean, look for a
+        // value terminator (", ')
+        attribute.terminator = c;
+      } else if (attribute.terminator) {
+        if (c === attribute.terminator) {
+          // if we had a terminator and found another, we've
+          // reach the end of the attribute
+          attributes[attribute.name] = attribute.value;
+          attribute = null;
+        } else {
+          // otherwise, append the character to the attribute value
+          attribute.value += c;
+
+          // check for an escaped terminator and push it as well
+          // to avoid terminating prematurely
+          if (c === "\\") {
+            const next = str.charAt(i + 1);
+            if (next === attribute.terminator) {
+              attribute.value += next;
+              i += 1;
+            }
+          }
+        }
+      } else if (!/\s/.test(c)) {
+        // if we've hit a non-space character and aren't processing a value,
+        // we're starting a new attribute so push the attribute and clear the
+        // local variable
+        attributes[attribute.name] = attribute.value;
+        attribute = null;
+
+        // move the cursor back to re-find the start of the attribute
+        i -= 1;
+      }
+    }
+
+    i++;
+  }
+
+  if (i !== start) {
+    return {
+      attributes,
+      index: i,
+    };
+  }
+
+  return null;
+}
+
+function parseFragment(str, start = 0) {
+  let tag = null;
+  let open = false;
+  let attributes = {};
+
+  let i = start;
+  while (i < str.length) {
+    const c = str.charAt(i++);
+
+    if (!open && !tag && c === "<") {
+      // Open Start Tag
+      open = true;
+
+      const tagNode = parseToken(str, i);
+      if (!tagNode) {
+        return null;
+      }
+
+      i = tagNode.index - 1;
+      tag = tagNode.token;
+    } else if (open && c === ">") {
+      // Close Start Tag
+      break;
+    } else if (open) {
+      // Attributes
+      const attributeNode = parseAttributes(str, i - 1);
+
+      if (attributeNode) {
+        i = attributeNode.index;
+        attributes = attributeNode.attributes || attributes;
+      }
+    }
+  }
+
+  if (tag) {
+    return {
+      tag,
+      attributes,
+    };
+  }
+
+  return null;
+}
+
+export default parseFragment;
+export { parseFragment };
diff --git a/devtools/client/debugger/src/workers/parser/utils/simple-path.js b/devtools/client/debugger/src/workers/parser/utils/simple-path.js
new file mode 100644
index 0000000000..b3958dcf42
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/simple-path.js
@@ -0,0 +1,104 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+export default function createSimplePath(ancestors) {
+  if (ancestors.length === 0) {
+    return null;
+  }
+
+  // Slice the array because babel-types traverse may continue mutating
+  // the ancestors array in later traversal logic.
+  return new SimplePath(ancestors.slice());
+}
+
+/**
+ * Mimics @babel/traverse's NodePath API in a simpler fashion that isn't as
+ * heavy, but still allows the ease of passing paths around to process nested
+ * AST structures.
+ */
+class SimplePath {
+  _index;
+  _ancestors;
+  _ancestor;
+
+  _parentPath;
+
+  constructor(ancestors, index = ancestors.length - 1) {
+    if (index < 0 || index >= ancestors.length) {
+      console.error(ancestors);
+      throw new Error("Created invalid path");
+    }
+
+    this._ancestors = ancestors;
+    this._ancestor = ancestors[index];
+    this._index = index;
+  }
+
+  get parentPath() {
+    let path = this._parentPath;
+    if (path === undefined) {
+      if (this._index === 0) {
+        path = null;
+      } else {
+        path = new SimplePath(this._ancestors, this._index - 1);
+      }
+      this._parentPath = path;
+    }
+
+    return path;
+  }
+
+  get parent() {
+    return this._ancestor.node;
+  }
+
+  get node() {
+    const { node, key, index } = this._ancestor;
+
+    if (typeof index === "number") {
+      return node[key][index];
+    }
+
+    return node[key];
+  }
+
+  get key() {
+    return this._ancestor.key;
+  }
+
+  get type() {
+    return this.node.type;
+  }
+
+  get inList() {
+    return typeof this._ancestor.index === "number";
+  }
+
+  get containerIndex() {
+    const { index } = this._ancestor;
+
+    if (typeof index !== "number") {
+      throw new Error("Cannot get index of non-array node");
+    }
+
+    return index;
+  }
+
+  find(predicate) {
+    for (let path = this; path; path = path.parentPath) {
+      if (predicate(path)) {
+        return path;
+      }
+    }
+    return null;
+  }
+
+  findParent(predicate) {
+    if (!this.parentPath) {
+      throw new Error("Cannot use findParent on root path");
+    }
+
+    return this.parentPath.find(predicate);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/parser/utils/tests/ast.spec.js b/devtools/client/debugger/src/workers/parser/utils/tests/ast.spec.js
new file mode 100644
index 0000000000..e8d2964205
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/utils/tests/ast.spec.js
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getAst } from "../ast";
+import { setSource } from "../../sources";
+import cases from "jest-in-case";
+
+import { makeMockSourceAndContent } from "../../../../utils/test-mockup";
+
+const astKeys = [
+  "type",
+  "start",
+  "end",
+  "loc",
+  "errors",
+  "program",
+  "comments",
+  "tokens",
+];
+
+cases(
+  "ast.getAst",
+  ({ name }) => {
+    const source = makeMockSourceAndContent(undefined, "foo", name, "2");
+    setSource({
+      id: source.id,
+      text: source.content.value || "",
+      contentType: source.content.contentType,
+      isWasm: false,
+    });
+    const ast = getAst("foo");
+    expect(ast && Object.keys(ast)).toEqual(astKeys);
+  },
+  [
+    { name: "text/javascript" },
+    { name: "application/javascript" },
+    { name: "application/x-javascript" },
+    { name: "text/jsx" },
+  ]
+);
diff --git a/devtools/client/debugger/src/workers/parser/worker.js b/devtools/client/debugger/src/workers/parser/worker.js
new file mode 100644
index 0000000000..e0c25632f3
--- /dev/null
+++ b/devtools/client/debugger/src/workers/parser/worker.js
@@ -0,0 +1,39 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import {
+  getSymbols,
+  getFunctionSymbols,
+  getClassSymbols,
+  getClosestFunctionName,
+  clearSymbols,
+} from "./getSymbols";
+import { clearASTs } from "./utils/ast";
+import getScopes, { clearScopes } from "./getScopes";
+import { setSource, clearSources } from "./sources";
+import findOutOfScopeLocations from "./findOutOfScopeLocations";
+import findBestMatchExpression from "./findBestMatchExpression";
+import mapExpression from "./mapExpression";
+
+import { workerHandler } from "../../../../shared/worker-utils";
+
+function clearAllHelpersForSources(sourceIds) {
+  clearASTs(sourceIds);
+  clearScopes(sourceIds);
+  clearSources(sourceIds);
+  clearSymbols(sourceIds);
+}
+
+self.onmessage = workerHandler({
+  findOutOfScopeLocations,
+  findBestMatchExpression,
+  getSymbols,
+  getFunctionSymbols,
+  getClassSymbols,
+  getClosestFunctionName,
+  getScopes,
+  clearSources: clearAllHelpersForSources,
+  mapExpression,
+  setSource,
+});
diff --git a/devtools/client/debugger/src/workers/pretty-print/LICENSE.md b/devtools/client/debugger/src/workers/pretty-print/LICENSE.md
new file mode 100644
index 0000000000..cc8e9a752c
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/LICENSE.md
@@ -0,0 +1,23 @@
+Copyright (c) 2013, Nick Fitzgerald
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/devtools/client/debugger/src/workers/pretty-print/index.js b/devtools/client/debugger/src/workers/pretty-print/index.js
new file mode 100644
index 0000000000..4b151b39e4
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/index.js
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { WorkerDispatcher } from "devtools/client/shared/worker-utils";
+
+const WORKER_URL =
+  "resource://devtools/client/debugger/dist/pretty-print-worker.js";
+
+export class PrettyPrintDispatcher extends WorkerDispatcher {
+  constructor(jestUrl) {
+    super(jestUrl || WORKER_URL);
+  }
+
+  #prettyPrintTask = this.task("prettyPrint");
+  #prettyPrintInlineScriptTask = this.task("prettyPrintInlineScript");
+  #getSourceMapForTask = this.task("getSourceMapForTask");
+
+  prettyPrint(options) {
+    return this.#prettyPrintTask(options);
+  }
+
+  prettyPrintInlineScript(options) {
+    return this.#prettyPrintInlineScriptTask(options);
+  }
+
+  getSourceMap(taskId) {
+    return this.#getSourceMapForTask(taskId);
+  }
+}
diff --git a/devtools/client/debugger/src/workers/pretty-print/moz.build b/devtools/client/debugger/src/workers/pretty-print/moz.build
new file mode 100644
index 0000000000..b7223ac81a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/moz.build
@@ -0,0 +1,10 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += []
+
+CompiledModules(
+    "index.js",
+)
diff --git a/devtools/client/debugger/src/workers/pretty-print/pretty-fast.js b/devtools/client/debugger/src/workers/pretty-print/pretty-fast.js
new file mode 100644
index 0000000000..44b07f4eda
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/pretty-fast.js
@@ -0,0 +1,1178 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+/* eslint-disable complexity */
+
+var acorn = require("acorn");
+var sourceMap = require("source-map");
+const NEWLINE_CODE = 10;
+
+export function prettyFast(input, options) {
+  return new PrettyFast(options).getPrettifiedCodeAndSourceMap(input);
+}
+
+// If any of these tokens are seen before a "[" token, we know that "[" token
+// is the start of an array literal, rather than a property access.
+//
+// The only exception is "}", which would need to be disambiguated by
+// parsing. The majority of the time, an open bracket following a closing
+// curly is going to be an array literal, so we brush the complication under
+// the rug, and handle the ambiguity by always assuming that it will be an
+// array literal.
+const PRE_ARRAY_LITERAL_TOKENS = new Set([
+  "typeof",
+  "void",
+  "delete",
+  "case",
+  "do",
+  "=",
+  "in",
+  "of",
+  "...",
+  "{",
+  "*",
+  "/",
+  "%",
+  "else",
+  ";",
+  "++",
+  "--",
+  "+",
+  "-",
+  "~",
+  "!",
+  ":",
+  "?",
+  ">>",
+  ">>>",
+  "<<",
+  "||",
+  "&&",
+  "<",
+  ">",
+  "<=",
+  ">=",
+  "instanceof",
+  "&",
+  "^",
+  "|",
+  "==",
+  "!=",
+  "===",
+  "!==",
+  ",",
+  "}",
+]);
+
+// If any of these tokens are seen before a "{" token, we know that "{" token
+// is the start of an object literal, rather than the start of a block.
+const PRE_OBJECT_LITERAL_TOKENS = new Set([
+  "typeof",
+  "void",
+  "delete",
+  "=",
+  "in",
+  "of",
+  "...",
+  "*",
+  "/",
+  "%",
+  "++",
+  "--",
+  "+",
+  "-",
+  "~",
+  "!",
+  ">>",
+  ">>>",
+  "<<",
+  "<",
+  ">",
+  "<=",
+  ">=",
+  "instanceof",
+  "&",
+  "^",
+  "|",
+  "==",
+  "!=",
+  "===",
+  "!==",
+]);
+
+class PrettyFast {
+  /**
+   * @param {Object} options: Provides configurability of the pretty printing.
+   * @param {String} options.url: The URL string of the ugly JS code.
+   * @param {String} options.indent: The string to indent code by.
+   * @param {SourceMapGenerator} options.sourceMapGenerator: An optional sourceMapGenerator
+   *                             the mappings will be added to.
+   * @param {Boolean} options.prefixWithNewLine: When true, the pretty printed code will start
+   *                  with a line break
+   * @param {Integer} options.originalStartLine: The line the passed script starts at (1-based).
+   *                  This is used for inline scripts where we need to account for the lines
+   *                  before the script tag
+   * @param {Integer} options.originalStartColumn: The column the passed script starts at (1-based).
+   *                  This is used for inline scripts where we need to account for the position
+   *                  of the script tag within the line.
+   * @param {Integer} options.generatedStartLine: The line where the pretty printed script
+   *                  will start at (1-based). This is used for pretty printing HTML file,
+   *                  where we might have handle previous inline scripts that impact the
+   *                  position of this script.
+   */
+  constructor(options = {}) {
+    // The level of indents deep we are.
+    this.#indentLevel = 0;
+    this.#indentChar = options.indent;
+
+    // We will handle mappings between ugly and pretty printed code in this SourceMapGenerator.
+    this.#sourceMapGenerator =
+      options.sourceMapGenerator ||
+      new sourceMap.SourceMapGenerator({
+        file: options.url,
+      });
+
+    this.#file = options.url;
+    this.#hasOriginalStartLine = "originalStartLine" in options;
+    this.#hasOriginalStartColumn = "originalStartColumn" in options;
+    this.#hasGeneratedStartLine = "generatedStartLine" in options;
+    this.#originalStartLine = options.originalStartLine;
+    this.#originalStartColumn = options.originalStartColumn;
+    this.#generatedStartLine = options.generatedStartLine;
+    this.#prefixWithNewLine = options.prefixWithNewLine;
+  }
+
+  /* options */
+  #indentChar;
+  #indentLevel;
+  #file;
+  #hasOriginalStartLine;
+  #hasOriginalStartColumn;
+  #hasGeneratedStartLine;
+  #originalStartLine;
+  #originalStartColumn;
+  #prefixWithNewLine;
+  #generatedStartLine;
+  #sourceMapGenerator;
+
+  /* internals */
+
+  // Whether or not we added a newline on after we added the previous token.
+  #addedNewline = false;
+  // Whether or not we added a space after we added the previous token.
+  #addedSpace = false;
+  #currentCode = "";
+  #currentLine = 1;
+  #currentColumn = 0;
+  // The tokens parsed by acorn.
+  #tokenQueue;
+  // The index of the current token in this.#tokenQueue.
+  #currentTokenIndex;
+  // The previous token we added to the pretty printed code.
+  #previousToken;
+  // Stack of token types/keywords that can affect whether we want to add a
+  // newline or a space. We can make that decision based on what token type is
+  // on the top of the stack. For example, a comma in a parameter list should
+  // be followed by a space, while a comma in an object literal should be
+  // followed by a newline.
+  //
+  // Strings that go on the stack:
+  //
+  //   - "{"
+  //   - "{\n"
+  //   - "("
+  //   - "(\n"
+  //   - "["
+  //   - "[\n"
+  //   - "do"
+  //   - "?"
+  //   - "switch"
+  //   - "case"
+  //   - "default"
+  //
+  // The difference between "[" and "[\n" (as well as "{" and "{\n", and "(" and "(\n")
+  // is that "\n" is used when we are treating (curly) brackets/parens as line delimiters
+  // and should increment and decrement the indent level when we find them.
+  // "[" can represent either a property access (e.g. `x["hi"]`), or an empty array literal
+  // "{" only represents an empty object literals
+  // "(" can represent lots of different things (wrapping expression, if/loop condition, function call, …)
+  #stack = [];
+
+  /**
+   * @param {String} input: The ugly JS code we want to pretty print.
+   * @returns {Object}
+   *          An object with the following properties:
+   *            - code: The pretty printed code string.
+   *            - map: A SourceMapGenerator instance.
+   */
+  getPrettifiedCodeAndSourceMap(input) {
+    // Add the initial new line if needed
+    if (this.#prefixWithNewLine) {
+      this.#write("\n");
+    }
+
+    // Pass through acorn's tokenizer and append tokens and comments into a
+    // single queue to process.  For example, the source file:
+    //
+    //     foo
+    //     // a
+    //     // b
+    //     bar
+    //
+    // After this process, tokenQueue has the following token stream:
+    //
+    //     [ foo, '// a', '// b', bar]
+    this.#tokenQueue = this.#getTokens(input);
+
+    for (let i = 0, len = this.#tokenQueue.length; i < len; i++) {
+      this.#currentTokenIndex = i;
+      const token = this.#tokenQueue[i];
+      const nextToken = this.#tokenQueue[i + 1];
+      this.#handleToken(token, nextToken);
+
+      // Acorn's tokenizer re-uses tokens, so we have to copy the previous token on
+      // every iteration. We follow acorn's lead here, and reuse the previousToken
+      // object the same way that acorn reuses the token object. This allows us
+      // to avoid allocations and minimize GC pauses.
+      if (!this.#previousToken) {
+        this.#previousToken = { loc: { start: {}, end: {} } };
+      }
+      this.#previousToken.start = token.start;
+      this.#previousToken.end = token.end;
+      this.#previousToken.loc.start.line = token.loc.start.line;
+      this.#previousToken.loc.start.column = token.loc.start.column;
+      this.#previousToken.loc.end.line = token.loc.end.line;
+      this.#previousToken.loc.end.column = token.loc.end.column;
+      this.#previousToken.type = token.type;
+      this.#previousToken.value = token.value;
+    }
+
+    return { code: this.#currentCode, map: this.#sourceMapGenerator };
+  }
+
+  /**
+   * Write a pretty printed string to the prettified string and for tokens, add their
+   * mapping to the SourceMapGenerator.
+   *
+   * @param String str
+   *        The string to be added to the result.
+   * @param Number line
+   *        The line number the string came from in the ugly source.
+   * @param Number column
+   *        The column number the string came from in the ugly source.
+   * @param Boolean isToken
+   *        Set to true when writing tokens, so we can differentiate them from the
+   *        whitespace we add.
+   */
+  #write(str, line, column, isToken) {
+    this.#currentCode += str;
+    if (isToken) {
+      this.#sourceMapGenerator.addMapping({
+        source: this.#file,
+        // We need to swap original and generated locations, as the prettified text should
+        // be seen by the sourcemap service as the "original" one.
+        generated: {
+          // originalStartLine is 1-based, and here we just want to offset by a number of
+          // lines, so we need to decrement it
+          line: this.#hasOriginalStartLine
+            ? line + (this.#originalStartLine - 1)
+            : line,
+          // We only need to adjust the column number if we're looking at the first line, to
+          // account for the html text before the opening <script> tag.
+          column:
+            line == 1 && this.#hasOriginalStartColumn
+              ? column + this.#originalStartColumn
+              : column,
+        },
+        original: {
+          // generatedStartLine is 1-based, and here we just want to offset by a number of
+          // lines, so we need to decrement it.
+          line: this.#hasGeneratedStartLine
+            ? this.#currentLine + (this.#generatedStartLine - 1)
+            : this.#currentLine,
+          column: this.#currentColumn,
+        },
+        name: null,
+      });
+    }
+
+    for (let idx = 0, length = str.length; idx < length; idx++) {
+      if (str.charCodeAt(idx) === NEWLINE_CODE) {
+        this.#currentLine++;
+        this.#currentColumn = 0;
+      } else {
+        this.#currentColumn++;
+      }
+    }
+  }
+
+  /**
+   * Add the given token to the pretty printed results.
+   *
+   * @param Object token
+   *        The token to add.
+   */
+  #writeToken(token) {
+    if (token.type.label == "string") {
+      this.#write(
+        `'${sanitize(token.value)}'`,
+        token.loc.start.line,
+        token.loc.start.column,
+        true
+      );
+    } else if (token.type.label == "regexp") {
+      this.#write(
+        String(token.value.value),
+        token.loc.start.line,
+        token.loc.start.column,
+        true
+      );
+    } else {
+      let value;
+      if (token.value != null) {
+        value = token.value;
+        if (token.type.label === "privateId") {
+          value = `#${value}`;
+        }
+      } else {
+        value = token.type.label;
+      }
+      this.#write(
+        String(value),
+        token.loc.start.line,
+        token.loc.start.column,
+        true
+      );
+    }
+  }
+
+  /**
+   * Returns the tokens computed with acorn.
+   *
+   * @param String input
+   *        The JS code we want the tokens of.
+   * @returns Array<Object>
+   */
+  #getTokens(input) {
+    const tokens = [];
+
+    const res = acorn.tokenizer(input, {
+      locations: true,
+      ecmaVersion: "latest",
+      onComment(block, text, start, end, startLoc, endLoc) {
+        tokens.push({
+          type: {},
+          comment: true,
+          block,
+          text,
+          loc: { start: startLoc, end: endLoc },
+        });
+      },
+    });
+
+    for (;;) {
+      const token = res.getToken();
+      tokens.push(token);
+      if (token.type.label == "eof") {
+        break;
+      }
+    }
+
+    return tokens;
+  }
+
+  /**
+   * Add the required whitespace before this token, whether that is a single
+   * space, newline, and/or the indent on fresh lines.
+   *
+   * @param Object token
+   *        The token we are currently handling.
+   * @param {Object|undefined} nextToken
+   *        The next token, might not exist if we're on the last token
+   */
+  #handleToken(token, nextToken) {
+    if (token.comment) {
+      let commentIndentLevel = this.#indentLevel;
+      if (this.#previousToken?.loc?.end?.line == token.loc.start.line) {
+        commentIndentLevel = 0;
+        this.#write(" ");
+      }
+      this.#addComment(
+        commentIndentLevel,
+        token.block,
+        token.text,
+        token.loc.start.line,
+        nextToken
+      );
+      return;
+    }
+
+    // Shorthand for token.type.keyword, so we don't have to repeatedly access
+    // properties.
+    const ttk = token.type.keyword;
+
+    if (ttk && this.#previousToken?.type?.label == ".") {
+      token.type = acorn.tokTypes.name;
+    }
+
+    // Shorthand for token.type.label, so we don't have to repeatedly access
+    // properties.
+    const ttl = token.type.label;
+
+    if (ttl == "eof") {
+      if (!this.#addedNewline) {
+        this.#write("\n");
+      }
+      return;
+    }
+
+    if (belongsOnStack(token)) {
+      let stackEntry;
+
+      if (isArrayLiteral(token, this.#previousToken)) {
+        // Don't add new lines for empty array literals
+        stackEntry = nextToken?.type?.label === "]" ? "[" : "[\n";
+      } else if (isObjectLiteral(token, this.#previousToken)) {
+        // Don't add new lines for empty object literals
+        stackEntry = nextToken?.type?.label === "}" ? "{" : "{\n";
+      } else if (
+        isRoundBracketStartingLongParenthesis(
+          token,
+          this.#tokenQueue,
+          this.#currentTokenIndex
+        )
+      ) {
+        stackEntry = "(\n";
+      } else if (ttl == "{") {
+        // We need to add a line break for "{" which are not empty object literals
+        stackEntry = "{\n";
+      } else {
+        stackEntry = ttl || ttk;
+      }
+
+      this.#stack.push(stackEntry);
+    }
+
+    this.#maybeDecrementIndent(token);
+    this.#prependWhiteSpace(token);
+    this.#writeToken(token);
+    this.#addedSpace = false;
+
+    // If the next token is going to be a comment starting on the same line,
+    // then no need to add a new line here
+    if (
+      !nextToken ||
+      !nextToken.comment ||
+      token.loc.end.line != nextToken.loc.start.line
+    ) {
+      this.#maybeAppendNewline(token);
+    }
+
+    this.#maybePopStack(token);
+    this.#maybeIncrementIndent(token);
+  }
+
+  /**
+   * Returns true if the given token should cause us to pop the stack.
+   */
+  #maybePopStack(token) {
+    const ttl = token.type.label;
+    const ttk = token.type.keyword;
+    const top = this.#stack.at(-1);
+
+    if (
+      ttl == "]" ||
+      ttl == ")" ||
+      ttl == "}" ||
+      (ttl == ":" && (top == "case" || top == "default" || top == "?")) ||
+      (ttk == "while" && top == "do")
+    ) {
+      this.#stack.pop();
+      if (ttl == "}" && this.#stack.at(-1) == "switch") {
+        this.#stack.pop();
+      }
+    }
+  }
+
+  #maybeIncrementIndent(token) {
+    if (
+      // Don't increment indent for empty object literals
+      (token.type.label == "{" && this.#stack.at(-1) === "{\n") ||
+      // Don't increment indent for empty array literals
+      (token.type.label == "[" && this.#stack.at(-1) === "[\n") ||
+      token.type.keyword == "switch" ||
+      (token.type.label == "(" && this.#stack.at(-1) === "(\n")
+    ) {
+      this.#indentLevel++;
+    }
+  }
+
+  #shouldDecrementIndent(token) {
+    const top = this.#stack.at(-1);
+    const ttl = token.type.label;
+    return (
+      (ttl == "}" && top == "{\n") ||
+      (ttl == "]" && top == "[\n") ||
+      (ttl == ")" && top == "(\n")
+    );
+  }
+
+  #maybeDecrementIndent(token) {
+    if (!this.#shouldDecrementIndent(token)) {
+      return;
+    }
+
+    const ttl = token.type.label;
+    this.#indentLevel--;
+    if (ttl == "}" && this.#stack.at(-2) == "switch") {
+      this.#indentLevel--;
+    }
+  }
+
+  /**
+   * Add a comment to the pretty printed code.
+   *
+   * @param Number indentLevel
+   *        The number of indents deep we are (might be different from this.#indentLevel).
+   * @param Boolean block
+   *        True if the comment is a multiline block style comment.
+   * @param String text
+   *        The text of the comment.
+   * @param Number line
+   *        The line number to comment appeared on.
+   * @param Object nextToken
+   *        The next token if any.
+   */
+  #addComment(indentLevel, block, text, line, nextToken) {
+    const indentString = this.#indentChar.repeat(indentLevel);
+    const needNewLineAfter =
+      !block || !(nextToken && nextToken.loc.start.line == line);
+
+    if (block) {
+      const commentLinesText = text
+        .split(new RegExp(`/\n${indentString}/`, "g"))
+        .join(`\n${indentString}`);
+
+      this.#write(
+        `${indentString}/*${commentLinesText}*/${needNewLineAfter ? "\n" : " "}`
+      );
+    } else {
+      this.#write(`${indentString}//${text}\n`);
+    }
+
+    this.#addedNewline = needNewLineAfter;
+    this.#addedSpace = !needNewLineAfter;
+  }
+
+  /**
+   * Add the required whitespace before this token, whether that is a single
+   * space, newline, and/or the indent on fresh lines.
+   *
+   * @param Object token
+   *        The token we are about to add to the pretty printed code.
+   */
+  #prependWhiteSpace(token) {
+    const ttk = token.type.keyword;
+    const ttl = token.type.label;
+    let newlineAdded = this.#addedNewline;
+    let spaceAdded = this.#addedSpace;
+    const ltt = this.#previousToken?.type?.label;
+
+    // Handle whitespace and newlines after "}" here instead of in
+    // `isLineDelimiter` because it is only a line delimiter some of the
+    // time. For example, we don't want to put "else if" on a new line after
+    // the first if's block.
+    if (this.#previousToken && ltt == "}") {
+      if (
+        (ttk == "while" && this.#stack.at(-1) == "do") ||
+        needsSpaceBeforeClosingCurlyBracket(ttk)
+      ) {
+        this.#write(" ");
+        spaceAdded = true;
+      } else if (needsLineBreakBeforeClosingCurlyBracket(ttl)) {
+        this.#write("\n");
+        newlineAdded = true;
+      }
+    }
+
+    if (
+      (ttl == ":" && this.#stack.at(-1) == "?") ||
+      (ttl == "}" && this.#stack.at(-1) == "${")
+    ) {
+      this.#write(" ");
+      spaceAdded = true;
+    }
+
+    if (this.#previousToken && ltt != "}" && ltt != "." && ttk == "else") {
+      this.#write(" ");
+      spaceAdded = true;
+    }
+
+    const ensureNewline = () => {
+      if (!newlineAdded) {
+        this.#write("\n");
+        newlineAdded = true;
+      }
+    };
+
+    if (isASI(token, this.#previousToken)) {
+      ensureNewline();
+    }
+
+    if (this.#shouldDecrementIndent(token)) {
+      ensureNewline();
+    }
+
+    if (newlineAdded) {
+      let indentLevel = this.#indentLevel;
+      if (ttk == "case" || ttk == "default") {
+        indentLevel--;
+      }
+      this.#write(this.#indentChar.repeat(indentLevel));
+    } else if (!spaceAdded && needsSpaceAfter(token, this.#previousToken)) {
+      this.#write(" ");
+      spaceAdded = true;
+    }
+  }
+
+  /**
+   * Append the necessary whitespace to the result after we have added the given
+   * token.
+   *
+   * @param Object token
+   *        The token that was just added to the result.
+   */
+  #maybeAppendNewline(token) {
+    if (!isLineDelimiter(token, this.#stack)) {
+      this.#addedNewline = false;
+      return;
+    }
+
+    this.#write("\n");
+    this.#addedNewline = true;
+  }
+}
+
+/**
+ * Determines if we think that the given token starts an array literal.
+ *
+ * @param Object token
+ *        The token we want to determine if it is an array literal.
+ * @param Object previousToken
+ *        The previous token we added to the pretty printed results.
+ *
+ * @returns Boolean
+ *          True if we believe it is an array literal, false otherwise.
+ */
+function isArrayLiteral(token, previousToken) {
+  if (token.type.label != "[") {
+    return false;
+  }
+  if (!previousToken) {
+    return true;
+  }
+  if (previousToken.type.isAssign) {
+    return true;
+  }
+
+  return PRE_ARRAY_LITERAL_TOKENS.has(
+    previousToken.type.keyword ||
+      // Some tokens ('of', 'yield', …) have a `token.type.keyword` of 'name' and their
+      // actual value in `token.value`
+      (previousToken.type.label == "name"
+        ? previousToken.value
+        : previousToken.type.label)
+  );
+}
+
+/**
+ * Determines if we think that the given token starts an object literal.
+ *
+ * @param Object token
+ *        The token we want to determine if it is an object literal.
+ * @param Object previousToken
+ *        The previous token we added to the pretty printed results.
+ *
+ * @returns Boolean
+ *          True if we believe it is an object literal, false otherwise.
+ */
+function isObjectLiteral(token, previousToken) {
+  if (token.type.label != "{") {
+    return false;
+  }
+  if (!previousToken) {
+    return false;
+  }
+  if (previousToken.type.isAssign) {
+    return true;
+  }
+  return PRE_OBJECT_LITERAL_TOKENS.has(
+    previousToken.type.keyword || previousToken.type.label
+  );
+}
+
+/**
+ * Determines if we think that the given token starts a long parenthesis
+ *
+ * @param {Object} token
+ *        The token we want to determine if it is the beginning of a long paren.
+ * @param {Array<Object>} tokenQueue
+ *        The whole list of tokens parsed by acorn
+ * @param {Integer} currentTokenIndex
+ *        The index of `token` in `tokenQueue`
+ * @returns
+ */
+function isRoundBracketStartingLongParenthesis(
+  token,
+  tokenQueue,
+  currentTokenIndex
+) {
+  if (token.type.label !== "(") {
+    return false;
+  }
+
+  // If we're just wrapping an object, we'll have a new line right after
+  if (tokenQueue[currentTokenIndex + 1].type.label == "{") {
+    return false;
+  }
+
+  // We're going to iterate through the following tokens until :
+  // - we find the closing parent
+  // - or we reached the maximum character we think should be in parenthesis
+  const longParentContentLength = 60;
+
+  // Keep track of other parens so we know when we get the closing one for `token`
+  let parenCount = 0;
+  let parenContentLength = 0;
+  for (let i = currentTokenIndex + 1, len = tokenQueue.length; i < len; i++) {
+    const currToken = tokenQueue[i];
+    const ttl = currToken.type.label;
+
+    if (ttl == "(") {
+      parenCount++;
+    } else if (ttl == ")") {
+      if (parenCount == 0) {
+        // Matching closing paren, if we got here, we didn't reach the length limit,
+        // as we return when parenContentLength is greater than the limit.
+        return false;
+      }
+      parenCount--;
+    }
+
+    // Aside block comments, all tokens start and end location are on the same line, so
+    // we can use `start` and `end` to deduce the token length.
+    const tokenLength = currToken.comment
+      ? currToken.text.length
+      : currToken.end - currToken.start;
+    parenContentLength += tokenLength;
+
+    // If we didn't find the matching closing paren yet and the characters from the
+    // tokens we evaluated so far are longer than the limit, so consider the token
+    // a long paren.
+    if (parenContentLength > longParentContentLength) {
+      return true;
+    }
+  }
+
+  // if we get to here, we didn't found a closing paren, which shouldn't happen
+  // (scripts with syntax error are not displayed in the debugger), but just to
+  // be safe, return false.
+  return false;
+}
+
+// If any of these tokens are followed by a token on a new line, we know that
+// ASI cannot happen.
+const PREVENT_ASI_AFTER_TOKENS = new Set([
+  // Binary operators
+  "*",
+  "/",
+  "%",
+  "+",
+  "-",
+  "<<",
+  ">>",
+  ">>>",
+  "<",
+  ">",
+  "<=",
+  ">=",
+  "instanceof",
+  "in",
+  "==",
+  "!=",
+  "===",
+  "!==",
+  "&",
+  "^",
+  "|",
+  "&&",
+  "||",
+  ",",
+  ".",
+  "=",
+  "*=",
+  "/=",
+  "%=",
+  "+=",
+  "-=",
+  "<<=",
+  ">>=",
+  ">>>=",
+  "&=",
+  "^=",
+  "|=",
+  // Unary operators
+  "delete",
+  "void",
+  "typeof",
+  "~",
+  "!",
+  "new",
+  // Function calls and grouped expressions
+  "(",
+]);
+
+// If any of these tokens are on a line after the token before it, we know
+// that ASI cannot happen.
+const PREVENT_ASI_BEFORE_TOKENS = new Set([
+  // Binary operators
+  "*",
+  "/",
+  "%",
+  "<<",
+  ">>",
+  ">>>",
+  "<",
+  ">",
+  "<=",
+  ">=",
+  "instanceof",
+  "in",
+  "==",
+  "!=",
+  "===",
+  "!==",
+  "&",
+  "^",
+  "|",
+  "&&",
+  "||",
+  ",",
+  ".",
+  "=",
+  "*=",
+  "/=",
+  "%=",
+  "+=",
+  "-=",
+  "<<=",
+  ">>=",
+  ">>>=",
+  "&=",
+  "^=",
+  "|=",
+  // Function calls
+  "(",
+]);
+
+/**
+ * Determine if a token can look like an identifier. More precisely,
+ * this determines if the token may end or start with a character from
+ * [A-Za-z0-9_].
+ *
+ * @param Object token
+ *        The token we are looking at.
+ *
+ * @returns Boolean
+ *          True if identifier-like.
+ */
+function isIdentifierLike(token) {
+  const ttl = token.type.label;
+  return (
+    ttl == "name" || ttl == "num" || ttl == "privateId" || !!token.type.keyword
+  );
+}
+
+/**
+ * Determines if Automatic Semicolon Insertion (ASI) occurs between these
+ * tokens.
+ *
+ * @param Object token
+ *        The current token.
+ * @param Object previousToken
+ *        The previous token we added to the pretty printed results.
+ *
+ * @returns Boolean
+ *          True if we believe ASI occurs.
+ */
+function isASI(token, previousToken) {
+  if (!previousToken) {
+    return false;
+  }
+  if (token.loc.start.line === previousToken.loc.start.line) {
+    return false;
+  }
+  if (
+    previousToken.type.keyword == "return" ||
+    previousToken.type.keyword == "yield" ||
+    (previousToken.type.label == "name" && previousToken.value == "yield")
+  ) {
+    return true;
+  }
+  if (
+    PREVENT_ASI_AFTER_TOKENS.has(
+      previousToken.type.label || previousToken.type.keyword
+    )
+  ) {
+    return false;
+  }
+  if (PREVENT_ASI_BEFORE_TOKENS.has(token.type.label || token.type.keyword)) {
+    return false;
+  }
+  return true;
+}
+
+/**
+ * Determine if we should add a newline after the given token.
+ *
+ * @param Object token
+ *        The token we are looking at.
+ * @param Array stack
+ *        The stack of open parens/curlies/brackets/etc.
+ *
+ * @returns Boolean
+ *          True if we should add a newline.
+ */
+function isLineDelimiter(token, stack) {
+  const ttl = token.type.label;
+  const top = stack.at(-1);
+  return (
+    (ttl == ";" && top != "(") ||
+    // Don't add a new line for empty object literals
+    (ttl == "{" && top == "{\n") ||
+    // Don't add a new line for empty array literals
+    (ttl == "[" && top == "[\n") ||
+    ((ttl == "," || ttl == "||" || ttl == "&&") && top != "(") ||
+    (ttl == ":" && (top == "case" || top == "default")) ||
+    (ttl == "(" && top == "(\n")
+  );
+}
+
+/**
+ * Determines if we need to add a space after the token we are about to add.
+ *
+ * @param Object token
+ *        The token we are about to add to the pretty printed code.
+ * @param Object [previousToken]
+ *        Optional previous token added to the pretty printed code.
+ */
+function needsSpaceAfter(token, previousToken) {
+  if (previousToken && needsSpaceBetweenTokens(token, previousToken)) {
+    return true;
+  }
+
+  if (token.type.isAssign) {
+    return true;
+  }
+  if (token.type.binop != null && previousToken) {
+    return true;
+  }
+  if (token.type.label == "?") {
+    return true;
+  }
+  if (token.type.label == "=>") {
+    return true;
+  }
+
+  return false;
+}
+
+function needsSpaceBeforePreviousToken(previousToken) {
+  if (previousToken.type.isLoop) {
+    return true;
+  }
+  if (previousToken.type.isAssign) {
+    return true;
+  }
+  if (previousToken.type.binop != null) {
+    return true;
+  }
+  if (previousToken.value == "of") {
+    return true;
+  }
+
+  const previousTokenTypeLabel = previousToken.type.label;
+  if (previousTokenTypeLabel == "?") {
+    return true;
+  }
+  if (previousTokenTypeLabel == ":") {
+    return true;
+  }
+  if (previousTokenTypeLabel == ",") {
+    return true;
+  }
+  if (previousTokenTypeLabel == ";") {
+    return true;
+  }
+  if (previousTokenTypeLabel == "${") {
+    return true;
+  }
+  if (previousTokenTypeLabel == "=>") {
+    return true;
+  }
+  return false;
+}
+
+function isBreakContinueOrReturnStatement(previousTokenKeyword) {
+  return (
+    previousTokenKeyword == "break" ||
+    previousTokenKeyword == "continue" ||
+    previousTokenKeyword == "return"
+  );
+}
+
+function needsSpaceBeforePreviousTokenKeywordAfterNotDot(previousTokenKeyword) {
+  return (
+    previousTokenKeyword != "debugger" &&
+    previousTokenKeyword != "null" &&
+    previousTokenKeyword != "true" &&
+    previousTokenKeyword != "false" &&
+    previousTokenKeyword != "this" &&
+    previousTokenKeyword != "default"
+  );
+}
+
+function needsSpaceBeforeClosingParen(tokenTypeLabel) {
+  return (
+    tokenTypeLabel != ")" &&
+    tokenTypeLabel != "]" &&
+    tokenTypeLabel != ";" &&
+    tokenTypeLabel != "," &&
+    tokenTypeLabel != "."
+  );
+}
+
+/**
+ * Determines if we need to add a space between the previous token we added and
+ * the token we are about to add.
+ *
+ * @param Object token
+ *        The token we are about to add to the pretty printed code.
+ * @param Object previousToken
+ *        The previous token added to the pretty printed code.
+ */
+function needsSpaceBetweenTokens(token, previousToken) {
+  if (needsSpaceBeforePreviousToken(previousToken)) {
+    return true;
+  }
+
+  const ltt = previousToken.type.label;
+  if (ltt == "num" && token.type.label == ".") {
+    return true;
+  }
+
+  const ltk = previousToken.type.keyword;
+  const ttl = token.type.label;
+  if (ltk != null && ttl != ".") {
+    if (isBreakContinueOrReturnStatement(ltk)) {
+      return ttl != ";";
+    }
+    if (needsSpaceBeforePreviousTokenKeywordAfterNotDot(ltk)) {
+      return true;
+    }
+  }
+
+  if (ltt == ")" && needsSpaceBeforeClosingParen(ttl)) {
+    return true;
+  }
+
+  if (isIdentifierLike(token) && isIdentifierLike(previousToken)) {
+    // We must emit a space to avoid merging the tokens.
+    return true;
+  }
+
+  if (token.type.label == "{" && previousToken.type.label == "name") {
+    return true;
+  }
+
+  return false;
+}
+
+function needsSpaceBeforeClosingCurlyBracket(tokenTypeKeyword) {
+  return (
+    tokenTypeKeyword == "else" ||
+    tokenTypeKeyword == "catch" ||
+    tokenTypeKeyword == "finally"
+  );
+}
+
+function needsLineBreakBeforeClosingCurlyBracket(tokenTypeLabel) {
+  return (
+    tokenTypeLabel != "(" &&
+    tokenTypeLabel != ";" &&
+    tokenTypeLabel != "," &&
+    tokenTypeLabel != ")" &&
+    tokenTypeLabel != "." &&
+    tokenTypeLabel != "template" &&
+    tokenTypeLabel != "`"
+  );
+}
+
+const escapeCharacters = {
+  // Backslash
+  "\\": "\\\\",
+  // Newlines
+  "\n": "\\n",
+  // Carriage return
+  "\r": "\\r",
+  // Tab
+  "\t": "\\t",
+  // Vertical tab
+  "\v": "\\v",
+  // Form feed
+  "\f": "\\f",
+  // Null character
+  "\0": "\\x00",
+  // Line separator
+  "\u2028": "\\u2028",
+  // Paragraph separator
+  "\u2029": "\\u2029",
+  // Single quotes
+  "'": "\\'",
+};
+
+// eslint-disable-next-line prefer-template
+const regExpString = "(" + Object.values(escapeCharacters).join("|") + ")";
+const escapeCharactersRegExp = new RegExp(regExpString, "g");
+
+function sanitizerReplaceFunc(_, c) {
+  return escapeCharacters[c];
+}
+
+/**
+ * Make sure that we output the escaped character combination inside string
+ * literals instead of various problematic characters.
+ */
+function sanitize(str) {
+  return str.replace(escapeCharactersRegExp, sanitizerReplaceFunc);
+}
+
+/**
+ * Returns true if the given token type belongs on the stack.
+ */
+function belongsOnStack(token) {
+  const ttl = token.type.label;
+  const ttk = token.type.keyword;
+  return (
+    ttl == "{" ||
+    ttl == "(" ||
+    ttl == "[" ||
+    ttl == "?" ||
+    ttl == "${" ||
+    ttk == "do" ||
+    ttk == "switch" ||
+    ttk == "case" ||
+    ttk == "default"
+  );
+}
diff --git a/devtools/client/debugger/src/workers/pretty-print/tests/__snapshots__/prettyFast.spec.js.snap b/devtools/client/debugger/src/workers/pretty-print/tests/__snapshots__/prettyFast.spec.js.snap
new file mode 100644
index 0000000000..498bee267e
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/tests/__snapshots__/prettyFast.spec.js.snap
@@ -0,0 +1,1974 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`ASI return 1`] = `
+"function f() {
+  return
+  {
+  }
+}
+"
+`;
+
+exports[`ASI return 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 9) -> (1, 9)",
+  "(1, 10) -> (1, 10)",
+  "(1, 11) -> (1, 11)",
+  "(1, 13) -> (1, 13)",
+  "(2, 2) -> (2, 13)",
+  "(3, 2) -> (3, 13)",
+  "(4, 2) -> (3, 14)",
+  "(5, 0) -> (4, 11)",
+]
+`;
+
+exports[`Arrays 1`] = `
+"var a = [
+  1,
+  2,
+  3
+];
+"
+`;
+
+exports[`Arrays 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(2, 2) -> (1, 7)",
+  "(2, 3) -> (1, 8)",
+  "(3, 2) -> (1, 9)",
+  "(3, 3) -> (1, 10)",
+  "(4, 2) -> (1, 11)",
+  "(5, 0) -> (1, 12)",
+  "(5, 1) -> (1, 13)",
+]
+`;
+
+exports[`Arrays and spread operator 1`] = `
+"var a = [
+  1,
+  ...[
+    2,
+    3
+  ],
+  ...[],
+  4
+];
+"
+`;
+
+exports[`Arrays and spread operator 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(2, 2) -> (1, 7)",
+  "(2, 3) -> (1, 8)",
+  "(3, 2) -> (1, 9)",
+  "(3, 5) -> (1, 12)",
+  "(4, 4) -> (1, 13)",
+  "(4, 5) -> (1, 14)",
+  "(5, 4) -> (1, 15)",
+  "(6, 2) -> (1, 16)",
+  "(6, 3) -> (1, 17)",
+  "(7, 2) -> (1, 18)",
+  "(7, 5) -> (1, 21)",
+  "(7, 6) -> (1, 22)",
+  "(7, 7) -> (1, 23)",
+  "(8, 2) -> (1, 25)",
+  "(9, 0) -> (1, 26)",
+  "(9, 1) -> (1, 27)",
+]
+`;
+
+exports[`Binary operators 1`] = `
+"var a = 5 * 30;
+var b = 5 >> 3;
+"
+`;
+
+exports[`Binary operators 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 10) -> (1, 7)",
+  "(1, 12) -> (1, 8)",
+  "(1, 14) -> (1, 10)",
+  "(2, 0) -> (1, 11)",
+  "(2, 4) -> (1, 15)",
+  "(2, 6) -> (1, 16)",
+  "(2, 8) -> (1, 17)",
+  "(2, 10) -> (1, 18)",
+  "(2, 13) -> (1, 20)",
+  "(2, 14) -> (1, 21)",
+]
+`;
+
+exports[`Bug 975477 don't move end of line comments to next line 1`] = `
+"switch (request.action) {
+  case 'show': //$NON-NLS-0$
+    if (localStorage.hideicon !== 'true') { //$NON-NLS-0$
+      chrome.pageAction.show(sender.tab.id);
+    }
+    break;
+  case 'hide': /*Multiline
+               Comment */
+    break;
+  default:
+    console.warn('unknown request'); //$NON-NLS-0$
+    // don't respond if you don't understand the message.
+    return;
+}
+"
+`;
+
+exports[`Bug 975477 don't move end of line comments to next line 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 7) -> (1, 7)",
+  "(1, 8) -> (1, 8)",
+  "(1, 15) -> (1, 15)",
+  "(1, 16) -> (1, 16)",
+  "(1, 22) -> (1, 22)",
+  "(1, 24) -> (1, 24)",
+  "(2, 2) -> (2, 13)",
+  "(2, 7) -> (2, 18)",
+  "(2, 13) -> (2, 24)",
+  "(3, 4) -> (3, 15)",
+  "(3, 7) -> (3, 18)",
+  "(3, 8) -> (3, 19)",
+  "(3, 20) -> (3, 31)",
+  "(3, 21) -> (3, 32)",
+  "(3, 30) -> (3, 41)",
+  "(3, 34) -> (3, 45)",
+  "(3, 40) -> (3, 51)",
+  "(3, 42) -> (3, 53)",
+  "(4, 6) -> (4, 17)",
+  "(4, 12) -> (4, 23)",
+  "(4, 13) -> (4, 24)",
+  "(4, 23) -> (4, 34)",
+  "(4, 24) -> (4, 35)",
+  "(4, 28) -> (4, 39)",
+  "(4, 29) -> (4, 40)",
+  "(4, 35) -> (4, 46)",
+  "(4, 36) -> (4, 47)",
+  "(4, 39) -> (4, 50)",
+  "(4, 40) -> (4, 51)",
+  "(4, 42) -> (4, 53)",
+  "(4, 43) -> (4, 54)",
+  "(5, 4) -> (5, 15)",
+  "(6, 4) -> (6, 15)",
+  "(6, 9) -> (6, 20)",
+  "(7, 2) -> (7, 13)",
+  "(7, 7) -> (7, 18)",
+  "(7, 13) -> (7, 24)",
+  "(9, 4) -> (9, 15)",
+  "(9, 9) -> (9, 20)",
+  "(10, 2) -> (10, 13)",
+  "(10, 9) -> (10, 20)",
+  "(11, 4) -> (11, 15)",
+  "(11, 11) -> (11, 22)",
+  "(11, 12) -> (11, 23)",
+  "(11, 16) -> (11, 27)",
+  "(11, 17) -> (11, 28)",
+  "(11, 34) -> (11, 45)",
+  "(11, 35) -> (11, 46)",
+  "(13, 4) -> (13, 15)",
+  "(13, 10) -> (13, 21)",
+  "(14, 0) -> (14, 11)",
+]
+`;
+
+exports[`Bug 977082 - space between grouping operator and dot notation 1`] = `
+"JSON.stringify(3).length;
+([1,
+2,
+3]).length;
+(new Date()).toLocaleString();
+"
+`;
+
+exports[`Bug 977082 - space between grouping operator and dot notation 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 5) -> (1, 5)",
+  "(1, 14) -> (1, 14)",
+  "(1, 15) -> (1, 15)",
+  "(1, 16) -> (1, 16)",
+  "(1, 17) -> (1, 17)",
+  "(1, 18) -> (1, 18)",
+  "(1, 24) -> (1, 24)",
+  "(2, 0) -> (2, 11)",
+  "(2, 1) -> (2, 12)",
+  "(2, 2) -> (2, 13)",
+  "(2, 3) -> (2, 14)",
+  "(3, 0) -> (2, 15)",
+  "(3, 1) -> (2, 16)",
+  "(4, 0) -> (2, 17)",
+  "(4, 1) -> (2, 18)",
+  "(4, 2) -> (2, 19)",
+  "(4, 3) -> (2, 20)",
+  "(4, 4) -> (2, 21)",
+  "(4, 10) -> (2, 27)",
+  "(5, 0) -> (3, 11)",
+  "(5, 1) -> (3, 12)",
+  "(5, 5) -> (3, 16)",
+  "(5, 9) -> (3, 20)",
+  "(5, 10) -> (3, 21)",
+  "(5, 11) -> (3, 22)",
+  "(5, 12) -> (3, 23)",
+  "(5, 13) -> (3, 24)",
+  "(5, 27) -> (3, 38)",
+  "(5, 28) -> (3, 39)",
+  "(5, 29) -> (3, 40)",
+]
+`;
+
+exports[`Bug 1206633 - spaces in for of 1`] = `
+"for (let tab of tabs) {
+}
+"
+`;
+
+exports[`Bug 1206633 - spaces in for of 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 5) -> (1, 5)",
+  "(1, 9) -> (1, 9)",
+  "(1, 13) -> (1, 13)",
+  "(1, 16) -> (1, 16)",
+  "(1, 20) -> (1, 20)",
+  "(1, 22) -> (1, 22)",
+  "(2, 0) -> (1, 23)",
+]
+`;
+
+exports[`Bug 1261971 - indentation after switch statement 1`] = `
+"{
+  switch (x) {
+  }
+  if (y) {
+  }
+  done();
+}
+"
+`;
+
+exports[`Bug 1261971 - indentation after switch statement 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(2, 2) -> (1, 1)",
+  "(2, 9) -> (1, 7)",
+  "(2, 10) -> (1, 8)",
+  "(2, 11) -> (1, 9)",
+  "(2, 13) -> (1, 10)",
+  "(3, 2) -> (1, 11)",
+  "(4, 2) -> (1, 12)",
+  "(4, 5) -> (1, 14)",
+  "(4, 6) -> (1, 15)",
+  "(4, 7) -> (1, 16)",
+  "(4, 9) -> (1, 17)",
+  "(5, 2) -> (1, 18)",
+  "(6, 2) -> (1, 19)",
+  "(6, 6) -> (1, 23)",
+  "(6, 7) -> (1, 24)",
+  "(6, 8) -> (1, 25)",
+  "(7, 0) -> (1, 26)",
+]
+`;
+
+exports[`Bug pretty-sure-3 - escaping line and paragraph separators 1`] = `
+"x = '\\\\u2029\\\\u2028';
+"
+`;
+
+exports[`Bug pretty-sure-3 - escaping line and paragraph separators 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 2) -> (1, 2)",
+  "(1, 4) -> (1, 4)",
+  "(1, 18) -> (1, 18)",
+]
+`;
+
+exports[`Bug pretty-sure-4 - escaping null character before digit 1`] = `
+"x = '\\\\x001';
+"
+`;
+
+exports[`Bug pretty-sure-4 - escaping null character before digit 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 2) -> (1, 2)",
+  "(1, 4) -> (1, 4)",
+  "(1, 11) -> (1, 13)",
+]
+`;
+
+exports[`Bug pretty-sure-5 - empty multiline comment shouldn't throw exception 1`] = `
+"{
+  /*
+           */
+  return;
+}
+"
+`;
+
+exports[`Bug pretty-sure-5 - empty multiline comment shouldn't throw exception 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(4, 2) -> (4, 13)",
+  "(4, 8) -> (4, 19)",
+  "(5, 0) -> (5, 11)",
+]
+`;
+
+exports[`Bug pretty-sure-6 - inline comment shouldn't move parenthesis to next line 1`] = `
+"return /* inline comment */ (1 + 1);
+"
+`;
+
+exports[`Bug pretty-sure-6 - inline comment shouldn't move parenthesis to next line 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 28) -> (1, 28)",
+  "(1, 29) -> (2, 13)",
+  "(1, 31) -> (2, 14)",
+  "(1, 33) -> (2, 15)",
+  "(1, 34) -> (2, 16)",
+  "(1, 35) -> (2, 17)",
+]
+`;
+
+exports[`Bug pretty-sure-7 - accessing a literal number property requires a space 1`] = `
+"0 .toString() + x.toString();
+"
+`;
+
+exports[`Bug pretty-sure-7 - accessing a literal number property requires a space 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 2) -> (1, 2)",
+  "(1, 3) -> (1, 3)",
+  "(1, 11) -> (1, 11)",
+  "(1, 12) -> (1, 12)",
+  "(1, 14) -> (1, 13)",
+  "(1, 16) -> (1, 14)",
+  "(1, 17) -> (1, 15)",
+  "(1, 18) -> (1, 16)",
+  "(1, 26) -> (1, 24)",
+  "(1, 27) -> (1, 25)",
+  "(1, 28) -> (1, 26)",
+]
+`;
+
+exports[`Bug pretty-sure-8 - return and yield only accept arguments when on the same line 1`] = `
+"{
+  return
+  (x)
+  yield
+  (x)
+  yield
+  * x
+}
+"
+`;
+
+exports[`Bug pretty-sure-8 - return and yield only accept arguments when on the same line 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(2, 2) -> (2, 13)",
+  "(3, 2) -> (3, 13)",
+  "(3, 3) -> (3, 14)",
+  "(3, 4) -> (3, 15)",
+  "(4, 2) -> (4, 13)",
+  "(5, 2) -> (5, 13)",
+  "(5, 3) -> (5, 14)",
+  "(5, 4) -> (5, 15)",
+  "(6, 2) -> (6, 13)",
+  "(7, 2) -> (7, 13)",
+  "(7, 4) -> (7, 14)",
+  "(8, 0) -> (8, 11)",
+]
+`;
+
+exports[`Bug pretty-sure-9 - accept unary operator at start of file 1`] = `
+"+ 0
+"
+`;
+
+exports[`Bug pretty-sure-9 - accept unary operator at start of file 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 2) -> (1, 2)",
+]
+`;
+
+exports[`Class extension within a function 1`] = `
+"(function () {
+  class X extends Y {
+    constructor() {
+    }
+  }
+}) ()
+"
+`;
+
+exports[`Class extension within a function 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 10) -> (1, 9)",
+  "(1, 11) -> (1, 10)",
+  "(1, 13) -> (1, 12)",
+  "(2, 2) -> (1, 15)",
+  "(2, 8) -> (1, 21)",
+  "(2, 10) -> (1, 23)",
+  "(2, 18) -> (1, 31)",
+  "(2, 20) -> (1, 33)",
+  "(3, 4) -> (1, 35)",
+  "(3, 15) -> (1, 46)",
+  "(3, 16) -> (1, 47)",
+  "(3, 18) -> (1, 49)",
+  "(4, 4) -> (1, 50)",
+  "(5, 2) -> (1, 52)",
+  "(6, 0) -> (1, 55)",
+  "(6, 1) -> (1, 56)",
+  "(6, 3) -> (1, 57)",
+  "(6, 4) -> (1, 58)",
+]
+`;
+
+exports[`Class handling 1`] = `
+"class Class {
+  constructor() {
+  }
+}
+"
+`;
+
+exports[`Class handling 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 6) -> (1, 7)",
+  "(1, 12) -> (1, 12)",
+  "(2, 2) -> (1, 13)",
+  "(2, 13) -> (1, 24)",
+  "(2, 14) -> (1, 25)",
+  "(2, 16) -> (1, 26)",
+  "(3, 2) -> (1, 27)",
+  "(4, 0) -> (1, 28)",
+]
+`;
+
+exports[`Code that relies on ASI 1`] = `
+"var foo = 10
+var bar = 20
+function g() {
+  a()
+  b()
+}
+"
+`;
+
+exports[`Code that relies on ASI 2`] = `
+Array [
+  "(1, 0) -> (2, 11)",
+  "(1, 4) -> (2, 15)",
+  "(1, 8) -> (2, 19)",
+  "(1, 10) -> (2, 21)",
+  "(2, 0) -> (3, 11)",
+  "(2, 4) -> (3, 15)",
+  "(2, 8) -> (3, 19)",
+  "(2, 10) -> (3, 21)",
+  "(3, 0) -> (4, 11)",
+  "(3, 9) -> (4, 20)",
+  "(3, 10) -> (4, 21)",
+  "(3, 11) -> (4, 22)",
+  "(3, 13) -> (4, 24)",
+  "(4, 2) -> (5, 13)",
+  "(4, 3) -> (5, 14)",
+  "(4, 4) -> (5, 15)",
+  "(5, 2) -> (6, 13)",
+  "(5, 3) -> (6, 14)",
+  "(5, 4) -> (6, 15)",
+  "(6, 0) -> (7, 11)",
+]
+`;
+
+exports[`Const handling 1`] = `
+"const d = 'yes';
+"
+`;
+
+exports[`Const handling 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 6) -> (1, 6)",
+  "(1, 8) -> (1, 8)",
+  "(1, 10) -> (1, 10)",
+  "(1, 15) -> (1, 15)",
+]
+`;
+
+exports[`Continue/break statements 1`] = `
+"while (1) {
+  if (x) {
+    continue
+  }
+  if (y) {
+    break
+  }
+  if (z) {
+    break foo
+  }
+}
+"
+`;
+
+exports[`Continue/break statements 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 6) -> (1, 5)",
+  "(1, 7) -> (1, 6)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(2, 2) -> (1, 9)",
+  "(2, 5) -> (1, 11)",
+  "(2, 6) -> (1, 12)",
+  "(2, 7) -> (1, 13)",
+  "(2, 9) -> (1, 14)",
+  "(3, 4) -> (1, 15)",
+  "(4, 2) -> (1, 23)",
+  "(5, 2) -> (1, 24)",
+  "(5, 5) -> (1, 26)",
+  "(5, 6) -> (1, 27)",
+  "(5, 7) -> (1, 28)",
+  "(5, 9) -> (1, 29)",
+  "(6, 4) -> (1, 30)",
+  "(7, 2) -> (1, 35)",
+  "(8, 2) -> (1, 36)",
+  "(8, 5) -> (1, 38)",
+  "(8, 6) -> (1, 39)",
+  "(8, 7) -> (1, 40)",
+  "(8, 9) -> (1, 41)",
+  "(9, 4) -> (1, 42)",
+  "(9, 10) -> (1, 48)",
+  "(10, 2) -> (1, 51)",
+  "(11, 0) -> (1, 52)",
+]
+`;
+
+exports[`Delete 1`] = `
+"delete obj.prop;
+"
+`;
+
+exports[`Delete 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 7) -> (1, 7)",
+  "(1, 10) -> (1, 10)",
+  "(1, 11) -> (1, 11)",
+  "(1, 15) -> (1, 15)",
+]
+`;
+
+exports[`Do/while loop 1`] = `
+"do {
+  x
+} while (y)
+"
+`;
+
+exports[`Do/while loop 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 3) -> (1, 2)",
+  "(2, 2) -> (1, 3)",
+  "(3, 0) -> (1, 4)",
+  "(3, 2) -> (1, 5)",
+  "(3, 8) -> (1, 10)",
+  "(3, 9) -> (1, 11)",
+  "(3, 10) -> (1, 12)",
+]
+`;
+
+exports[`Dot handling with keywords which are identifier name 1`] = `
+"y.await.break.const.delete.else.return.new.yield = 1.23;
+"
+`;
+
+exports[`Dot handling with keywords which are identifier name 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 2) -> (1, 2)",
+  "(1, 7) -> (1, 7)",
+  "(1, 8) -> (1, 8)",
+  "(1, 13) -> (1, 13)",
+  "(1, 14) -> (1, 14)",
+  "(1, 19) -> (1, 19)",
+  "(1, 20) -> (1, 20)",
+  "(1, 26) -> (1, 26)",
+  "(1, 27) -> (1, 27)",
+  "(1, 31) -> (1, 31)",
+  "(1, 32) -> (1, 32)",
+  "(1, 38) -> (1, 38)",
+  "(1, 39) -> (1, 39)",
+  "(1, 42) -> (1, 42)",
+  "(1, 43) -> (1, 43)",
+  "(1, 49) -> (1, 49)",
+  "(1, 51) -> (1, 51)",
+  "(1, 55) -> (1, 55)",
+]
+`;
+
+exports[`Dot handling with let which is identifier name 1`] = `
+"y.let.let = 1.23;
+"
+`;
+
+exports[`Dot handling with let which is identifier name 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 2) -> (1, 2)",
+  "(1, 5) -> (1, 5)",
+  "(1, 6) -> (1, 6)",
+  "(1, 10) -> (1, 10)",
+  "(1, 12) -> (1, 12)",
+  "(1, 16) -> (1, 16)",
+]
+`;
+
+exports[`Empty object/array literals 1`] = `
+"let a = [];
+const b = {};
+c = {
+  ...{},
+  d: 42
+};
+for (let x of []) {
+  for (let y in {}) {
+  }
+}
+"
+`;
+
+exports[`Empty object/array literals 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 9) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(2, 0) -> (1, 9)",
+  "(2, 6) -> (1, 15)",
+  "(2, 8) -> (1, 16)",
+  "(2, 10) -> (1, 17)",
+  "(2, 11) -> (1, 18)",
+  "(2, 12) -> (1, 19)",
+  "(3, 0) -> (1, 20)",
+  "(3, 2) -> (1, 21)",
+  "(3, 4) -> (1, 22)",
+  "(4, 2) -> (1, 23)",
+  "(4, 5) -> (1, 26)",
+  "(4, 6) -> (1, 27)",
+  "(4, 7) -> (1, 28)",
+  "(5, 2) -> (1, 29)",
+  "(5, 3) -> (1, 30)",
+  "(5, 5) -> (1, 32)",
+  "(6, 0) -> (1, 34)",
+  "(6, 1) -> (1, 35)",
+  "(7, 0) -> (1, 36)",
+  "(7, 4) -> (1, 39)",
+  "(7, 5) -> (1, 40)",
+  "(7, 9) -> (1, 44)",
+  "(7, 11) -> (1, 46)",
+  "(7, 14) -> (1, 49)",
+  "(7, 15) -> (1, 50)",
+  "(7, 16) -> (1, 51)",
+  "(7, 18) -> (1, 52)",
+  "(8, 2) -> (1, 53)",
+  "(8, 6) -> (1, 56)",
+  "(8, 7) -> (1, 57)",
+  "(8, 11) -> (1, 61)",
+  "(8, 13) -> (1, 63)",
+  "(8, 16) -> (1, 66)",
+  "(8, 17) -> (1, 67)",
+  "(8, 18) -> (1, 68)",
+  "(8, 20) -> (1, 69)",
+  "(9, 2) -> (1, 70)",
+  "(10, 0) -> (1, 71)",
+]
+`;
+
+exports[`Escaping backslashes in strings 1`] = `
+"'\\\\\\\\'
+"
+`;
+
+exports[`Escaping backslashes in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`Escaping carriage return in strings 1`] = `
+"'\\\\r'
+"
+`;
+
+exports[`Escaping carriage return in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`Escaping form feed in strings 1`] = `
+"'\\\\f'
+"
+`;
+
+exports[`Escaping form feed in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`Escaping null character in strings 1`] = `
+"'\\\\x00'
+"
+`;
+
+exports[`Escaping null character in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`Escaping tab in strings 1`] = `
+"'\\\\t'
+"
+`;
+
+exports[`Escaping tab in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`Escaping vertical tab in strings 1`] = `
+"'\\\\v'
+"
+`;
+
+exports[`Escaping vertical tab in strings 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+]
+`;
+
+exports[`False assignment 1`] = `
+"var foo = false;
+"
+`;
+
+exports[`False assignment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(1, 15) -> (1, 13)",
+]
+`;
+
+exports[`Fat arrow function 1`] = `
+"const a = () => 42
+addEventListener('click', e => {
+  return false
+});
+const sum = (c, d) => c + d
+"
+`;
+
+exports[`Fat arrow function 2`] = `
+Array [
+  "(1, 0) -> (2, 6)",
+  "(1, 6) -> (2, 12)",
+  "(1, 8) -> (2, 14)",
+  "(1, 10) -> (2, 16)",
+  "(1, 11) -> (2, 17)",
+  "(1, 13) -> (2, 19)",
+  "(1, 16) -> (2, 22)",
+  "(2, 0) -> (3, 6)",
+  "(2, 16) -> (3, 22)",
+  "(2, 17) -> (3, 23)",
+  "(2, 24) -> (3, 30)",
+  "(2, 26) -> (3, 32)",
+  "(2, 28) -> (3, 34)",
+  "(2, 31) -> (3, 37)",
+  "(3, 2) -> (3, 39)",
+  "(3, 9) -> (3, 46)",
+  "(4, 0) -> (3, 52)",
+  "(4, 1) -> (3, 53)",
+  "(4, 2) -> (3, 54)",
+  "(5, 0) -> (4, 6)",
+  "(5, 6) -> (4, 12)",
+  "(5, 10) -> (4, 16)",
+  "(5, 12) -> (4, 18)",
+  "(5, 13) -> (4, 19)",
+  "(5, 14) -> (4, 20)",
+  "(5, 16) -> (4, 21)",
+  "(5, 17) -> (4, 22)",
+  "(5, 19) -> (4, 24)",
+  "(5, 22) -> (4, 27)",
+  "(5, 24) -> (4, 28)",
+  "(5, 26) -> (4, 29)",
+]
+`;
+
+exports[`For loop 1`] = `
+"for (var i = 0; i < n; i++) {
+  console.log(i);
+}
+"
+`;
+
+exports[`For loop 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 5) -> (1, 5)",
+  "(1, 9) -> (1, 9)",
+  "(1, 11) -> (1, 11)",
+  "(1, 13) -> (1, 13)",
+  "(1, 14) -> (1, 14)",
+  "(1, 16) -> (1, 16)",
+  "(1, 18) -> (1, 18)",
+  "(1, 20) -> (1, 20)",
+  "(1, 21) -> (1, 21)",
+  "(1, 23) -> (1, 23)",
+  "(1, 24) -> (1, 24)",
+  "(1, 26) -> (1, 26)",
+  "(1, 28) -> (1, 28)",
+  "(2, 2) -> (1, 30)",
+  "(2, 9) -> (1, 37)",
+  "(2, 10) -> (1, 38)",
+  "(2, 13) -> (1, 41)",
+  "(2, 14) -> (1, 42)",
+  "(2, 15) -> (1, 43)",
+  "(2, 16) -> (1, 44)",
+  "(3, 0) -> (1, 46)",
+]
+`;
+
+exports[`Function calls 1`] = `
+"var result = func(a, b, c, d);
+"
+`;
+
+exports[`Function calls 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 11) -> (1, 10)",
+  "(1, 13) -> (1, 11)",
+  "(1, 17) -> (1, 15)",
+  "(1, 18) -> (1, 16)",
+  "(1, 19) -> (1, 17)",
+  "(1, 21) -> (1, 18)",
+  "(1, 22) -> (1, 19)",
+  "(1, 24) -> (1, 20)",
+  "(1, 25) -> (1, 21)",
+  "(1, 27) -> (1, 22)",
+  "(1, 28) -> (1, 23)",
+  "(1, 29) -> (1, 24)",
+]
+`;
+
+exports[`Getter and setter literals 1`] = `
+"var obj = {
+  get foo() {
+    return this._foo
+  },
+  set foo(v) {
+    this._foo = v
+  }
+}
+"
+`;
+
+exports[`Getter and setter literals 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(2, 2) -> (1, 9)",
+  "(2, 6) -> (1, 13)",
+  "(2, 9) -> (1, 16)",
+  "(2, 10) -> (1, 17)",
+  "(2, 12) -> (1, 18)",
+  "(3, 4) -> (1, 19)",
+  "(3, 11) -> (1, 26)",
+  "(3, 15) -> (1, 30)",
+  "(3, 16) -> (1, 31)",
+  "(4, 2) -> (1, 35)",
+  "(4, 3) -> (1, 36)",
+  "(5, 2) -> (1, 37)",
+  "(5, 6) -> (1, 41)",
+  "(5, 9) -> (1, 44)",
+  "(5, 10) -> (1, 45)",
+  "(5, 11) -> (1, 46)",
+  "(5, 13) -> (1, 47)",
+  "(6, 4) -> (1, 48)",
+  "(6, 8) -> (1, 52)",
+  "(6, 9) -> (1, 53)",
+  "(6, 14) -> (1, 57)",
+  "(6, 16) -> (1, 58)",
+  "(7, 2) -> (1, 59)",
+  "(8, 0) -> (1, 60)",
+]
+`;
+
+exports[`If/else statement 1`] = `
+"if (c) {
+  then()
+} else {
+  other()
+}
+"
+`;
+
+exports[`If/else statement 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 3) -> (1, 2)",
+  "(1, 4) -> (1, 3)",
+  "(1, 5) -> (1, 4)",
+  "(1, 7) -> (1, 5)",
+  "(2, 2) -> (1, 6)",
+  "(2, 6) -> (1, 10)",
+  "(2, 7) -> (1, 11)",
+  "(3, 0) -> (1, 12)",
+  "(3, 2) -> (1, 13)",
+  "(3, 7) -> (1, 17)",
+  "(4, 2) -> (1, 18)",
+  "(4, 7) -> (1, 23)",
+  "(4, 8) -> (1, 24)",
+  "(5, 0) -> (1, 25)",
+]
+`;
+
+exports[`If/else without curlies 1`] = `
+"if (c) a else b
+"
+`;
+
+exports[`If/else without curlies 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 3) -> (1, 2)",
+  "(1, 4) -> (1, 3)",
+  "(1, 5) -> (1, 4)",
+  "(1, 7) -> (1, 6)",
+  "(1, 9) -> (1, 8)",
+  "(1, 14) -> (1, 13)",
+]
+`;
+
+exports[`Immediately invoked function expression 1`] = `
+"(function () {
+  thingy()
+}())
+"
+`;
+
+exports[`Immediately invoked function expression 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 10) -> (1, 9)",
+  "(1, 11) -> (1, 10)",
+  "(1, 13) -> (1, 11)",
+  "(2, 2) -> (1, 12)",
+  "(2, 8) -> (1, 18)",
+  "(2, 9) -> (1, 19)",
+  "(3, 0) -> (1, 20)",
+  "(3, 1) -> (1, 21)",
+  "(3, 2) -> (1, 22)",
+  "(3, 3) -> (1, 23)",
+]
+`;
+
+exports[`In operator 1`] = `
+"if (foo in bar) {
+  doThing()
+}
+"
+`;
+
+exports[`In operator 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 3) -> (1, 2)",
+  "(1, 4) -> (1, 3)",
+  "(1, 8) -> (1, 7)",
+  "(1, 11) -> (1, 10)",
+  "(1, 14) -> (1, 13)",
+  "(1, 16) -> (1, 14)",
+  "(2, 2) -> (1, 15)",
+  "(2, 9) -> (1, 22)",
+  "(2, 10) -> (1, 23)",
+  "(3, 0) -> (1, 24)",
+]
+`;
+
+exports[`Indented multiline comment 1`] = `
+"function foo() {
+  /**
+              * java doc style comment
+              * more comment
+              */
+  bar();
+}
+"
+`;
+
+exports[`Indented multiline comment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 9) -> (1, 9)",
+  "(1, 12) -> (1, 12)",
+  "(1, 13) -> (1, 13)",
+  "(1, 15) -> (1, 15)",
+  "(6, 2) -> (6, 13)",
+  "(6, 5) -> (6, 16)",
+  "(6, 6) -> (6, 17)",
+  "(6, 7) -> (6, 18)",
+  "(7, 0) -> (7, 11)",
+]
+`;
+
+exports[`Instanceof 1`] = `
+"var a = x instanceof y;
+"
+`;
+
+exports[`Instanceof 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 10) -> (1, 8)",
+  "(1, 21) -> (1, 19)",
+  "(1, 22) -> (1, 20)",
+]
+`;
+
+exports[`Let handling with value 1`] = `
+"let d = 'yes';
+"
+`;
+
+exports[`Let handling with value 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 6)",
+  "(1, 8) -> (1, 8)",
+  "(1, 13) -> (1, 13)",
+]
+`;
+
+exports[`Let handling without value 1`] = `
+"let d;
+"
+`;
+
+exports[`Let handling without value 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 5) -> (1, 5)",
+]
+`;
+
+exports[`Long parenthesis 1`] = `
+"if (
+  thisIsAVeryLongVariable &&
+  thisIsAnotherOne ||
+  yetAnotherVeryLongVariable
+) {
+  (
+    thisIsAnotherOne = thisMayReturnNull() ||
+    'hi',
+    thisIsAVeryLongVariable = 42,
+    yetAnotherVeryLongVariable &&
+    doSomething(
+      true /* do it well */ ,
+      thisIsAVeryLongVariable,
+      thisIsAnotherOne,
+      yetAnotherVeryLongVariable
+    )
+  )
+}
+for (
+  let thisIsAnotherVeryLongVariable = 0;
+  i < thisIsAnotherVeryLongVariable.length;
+  thisIsAnotherVeryLongVariable++
+) {
+}
+const x = ({
+  thisIsAnotherVeryLongPropertyName: 'but should not cause the paren to be a line delimiter'
+})
+"
+`;
+
+exports[`Long parenthesis 2`] = `
+Array [
+  "(1, 0) -> (2, 6)",
+  "(1, 3) -> (2, 9)",
+  "(2, 2) -> (2, 10)",
+  "(2, 26) -> (2, 34)",
+  "(3, 2) -> (2, 37)",
+  "(3, 19) -> (2, 54)",
+  "(4, 2) -> (2, 57)",
+  "(5, 0) -> (2, 83)",
+  "(5, 2) -> (2, 85)",
+  "(6, 2) -> (3, 8)",
+  "(7, 4) -> (3, 9)",
+  "(7, 21) -> (3, 26)",
+  "(7, 23) -> (3, 28)",
+  "(7, 40) -> (3, 45)",
+  "(7, 41) -> (3, 46)",
+  "(7, 43) -> (3, 48)",
+  "(8, 4) -> (3, 51)",
+  "(8, 8) -> (3, 55)",
+  "(9, 4) -> (3, 57)",
+  "(9, 28) -> (3, 81)",
+  "(9, 30) -> (3, 83)",
+  "(9, 32) -> (3, 85)",
+  "(10, 4) -> (3, 87)",
+  "(10, 31) -> (3, 114)",
+  "(11, 4) -> (3, 117)",
+  "(11, 15) -> (3, 128)",
+  "(12, 6) -> (3, 129)",
+  "(12, 28) -> (3, 150)",
+  "(13, 6) -> (3, 151)",
+  "(13, 29) -> (3, 174)",
+  "(14, 6) -> (3, 176)",
+  "(14, 22) -> (3, 192)",
+  "(15, 6) -> (3, 194)",
+  "(16, 4) -> (3, 220)",
+  "(17, 2) -> (3, 221)",
+  "(18, 0) -> (4, 6)",
+  "(19, 0) -> (5, 6)",
+  "(19, 4) -> (5, 10)",
+  "(20, 2) -> (5, 11)",
+  "(20, 6) -> (5, 15)",
+  "(20, 36) -> (5, 45)",
+  "(20, 38) -> (5, 47)",
+  "(20, 39) -> (5, 48)",
+  "(21, 2) -> (5, 50)",
+  "(21, 4) -> (5, 52)",
+  "(21, 6) -> (5, 54)",
+  "(21, 35) -> (5, 83)",
+  "(21, 36) -> (5, 84)",
+  "(21, 42) -> (5, 90)",
+  "(22, 2) -> (5, 92)",
+  "(22, 31) -> (5, 121)",
+  "(23, 0) -> (5, 123)",
+  "(23, 2) -> (5, 125)",
+  "(24, 0) -> (5, 126)",
+  "(25, 0) -> (6, 6)",
+  "(25, 6) -> (6, 12)",
+  "(25, 8) -> (6, 14)",
+  "(25, 10) -> (6, 16)",
+  "(25, 11) -> (6, 17)",
+  "(26, 2) -> (6, 18)",
+  "(26, 35) -> (6, 51)",
+  "(26, 37) -> (6, 53)",
+  "(27, 0) -> (6, 108)",
+  "(27, 1) -> (6, 109)",
+]
+`;
+
+exports[`Multi line comment 1`] = `
+"/* Comment
+    more comment */
+function foo() {
+  bar();
+}
+"
+`;
+
+exports[`Multi line comment 2`] = `
+Array [
+  "(3, 0) -> (4, 4)",
+  "(3, 9) -> (4, 13)",
+  "(3, 12) -> (4, 16)",
+  "(3, 13) -> (4, 17)",
+  "(3, 15) -> (4, 19)",
+  "(4, 2) -> (4, 21)",
+  "(4, 5) -> (4, 24)",
+  "(4, 6) -> (4, 25)",
+  "(4, 7) -> (4, 26)",
+  "(5, 0) -> (4, 28)",
+]
+`;
+
+exports[`Multiple single line comments 1`] = `
+"function f() {
+  // a
+  // b
+  // c
+}
+"
+`;
+
+exports[`Multiple single line comments 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 9) -> (1, 9)",
+  "(1, 10) -> (1, 10)",
+  "(1, 11) -> (1, 11)",
+  "(1, 13) -> (1, 13)",
+  "(5, 0) -> (5, 11)",
+]
+`;
+
+exports[`Named class handling 1`] = `
+"let unnamed = class Class {
+  constructor() {
+  }
+}
+"
+`;
+
+exports[`Named class handling 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 12) -> (1, 11)",
+  "(1, 14) -> (1, 12)",
+  "(1, 20) -> (1, 18)",
+  "(1, 26) -> (1, 23)",
+  "(2, 2) -> (1, 24)",
+  "(2, 13) -> (1, 35)",
+  "(2, 14) -> (1, 36)",
+  "(2, 16) -> (1, 37)",
+  "(3, 2) -> (1, 38)",
+  "(4, 0) -> (1, 39)",
+]
+`;
+
+exports[`Nested function 1`] = `
+"function foo() {
+  function bar() {
+    debugger;
+  }
+  bar();
+}
+"
+`;
+
+exports[`Nested function 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 9) -> (1, 9)",
+  "(1, 12) -> (1, 12)",
+  "(1, 13) -> (1, 13)",
+  "(1, 15) -> (1, 15)",
+  "(2, 2) -> (1, 17)",
+  "(2, 11) -> (1, 26)",
+  "(2, 14) -> (1, 29)",
+  "(2, 15) -> (1, 30)",
+  "(2, 17) -> (1, 32)",
+  "(3, 4) -> (1, 34)",
+  "(3, 12) -> (1, 42)",
+  "(4, 2) -> (1, 44)",
+  "(5, 2) -> (1, 46)",
+  "(5, 5) -> (1, 49)",
+  "(5, 6) -> (1, 50)",
+  "(5, 7) -> (1, 51)",
+  "(6, 0) -> (1, 53)",
+]
+`;
+
+exports[`New expression 1`] = `
+"var foo = new Foo();
+"
+`;
+
+exports[`New expression 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(1, 14) -> (1, 12)",
+  "(1, 17) -> (1, 15)",
+  "(1, 18) -> (1, 16)",
+  "(1, 19) -> (1, 17)",
+]
+`;
+
+exports[`Non-ASI function call 1`] = `
+"f()
+"
+`;
+
+exports[`Non-ASI function call 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (2, 11)",
+  "(1, 2) -> (2, 12)",
+]
+`;
+
+exports[`Non-ASI in 1`] = `
+"'x' in foo
+"
+`;
+
+exports[`Non-ASI in 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (2, 11)",
+  "(1, 7) -> (2, 14)",
+]
+`;
+
+exports[`Non-ASI new 1`] = `
+"new F()
+"
+`;
+
+exports[`Non-ASI new 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (2, 11)",
+  "(1, 5) -> (2, 12)",
+  "(1, 6) -> (2, 13)",
+]
+`;
+
+exports[`Non-ASI property access 1`] = `
+"[
+  1,
+  2,
+  3
+]
+[0]
+"
+`;
+
+exports[`Non-ASI property access 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(2, 2) -> (1, 1)",
+  "(2, 3) -> (1, 2)",
+  "(3, 2) -> (1, 3)",
+  "(3, 3) -> (1, 4)",
+  "(4, 2) -> (1, 5)",
+  "(5, 0) -> (1, 6)",
+  "(6, 0) -> (2, 11)",
+  "(6, 1) -> (2, 12)",
+  "(6, 2) -> (2, 13)",
+]
+`;
+
+exports[`Null assignment 1`] = `
+"var i = null;
+"
+`;
+
+exports[`Null assignment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 12) -> (1, 10)",
+]
+`;
+
+exports[`Objects 1`] = `
+"var o = {
+  a: 1,
+  b: 2
+};
+"
+`;
+
+exports[`Objects 2`] = `
+Array [
+  "(1, 0) -> (2, 6)",
+  "(1, 4) -> (2, 10)",
+  "(1, 6) -> (2, 11)",
+  "(1, 8) -> (2, 12)",
+  "(2, 2) -> (2, 13)",
+  "(2, 3) -> (2, 14)",
+  "(2, 5) -> (2, 15)",
+  "(2, 6) -> (2, 16)",
+  "(3, 2) -> (3, 6)",
+  "(3, 3) -> (3, 7)",
+  "(3, 5) -> (3, 8)",
+  "(4, 0) -> (3, 9)",
+  "(4, 1) -> (3, 10)",
+]
+`;
+
+exports[`Optional chaining parsing support 1`] = `
+"x?.y?.z?.['a']?.check();
+"
+`;
+
+exports[`Optional chaining parsing support 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 3) -> (1, 3)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 6)",
+  "(1, 7) -> (1, 7)",
+  "(1, 9) -> (1, 9)",
+  "(1, 10) -> (1, 10)",
+  "(1, 13) -> (1, 13)",
+  "(1, 14) -> (1, 14)",
+  "(1, 16) -> (1, 16)",
+  "(1, 21) -> (1, 21)",
+  "(1, 22) -> (1, 22)",
+  "(1, 23) -> (1, 23)",
+]
+`;
+
+exports[`Private fields parsing support 1`] = `
+"class MyClass {
+  constructor(a) {
+    this.#a = a;
+    this.#b = Math.random();
+    this.ab = this.#getAB();
+  }
+  #a
+  #b = 'default value'
+  static #someStaticPrivate
+  #getA() {
+    return this.#a;
+  }
+  #getAB() {
+    return this.#getA() + this.#b
+  }
+}
+"
+`;
+
+exports[`Private fields parsing support 2`] = `
+Array [
+  "(1, 0) -> (2, 6)",
+  "(1, 6) -> (2, 12)",
+  "(1, 14) -> (2, 20)",
+  "(2, 2) -> (3, 8)",
+  "(2, 13) -> (3, 19)",
+  "(2, 14) -> (3, 20)",
+  "(2, 15) -> (3, 21)",
+  "(2, 17) -> (3, 23)",
+  "(3, 4) -> (4, 10)",
+  "(3, 8) -> (4, 14)",
+  "(3, 9) -> (4, 15)",
+  "(3, 12) -> (4, 18)",
+  "(3, 14) -> (4, 20)",
+  "(3, 15) -> (4, 21)",
+  "(4, 4) -> (4, 22)",
+  "(4, 8) -> (4, 26)",
+  "(4, 9) -> (4, 27)",
+  "(4, 12) -> (4, 30)",
+  "(4, 14) -> (4, 32)",
+  "(4, 18) -> (4, 36)",
+  "(4, 19) -> (4, 37)",
+  "(4, 25) -> (4, 43)",
+  "(4, 26) -> (4, 44)",
+  "(4, 27) -> (4, 45)",
+  "(5, 4) -> (4, 46)",
+  "(5, 8) -> (4, 50)",
+  "(5, 9) -> (4, 51)",
+  "(5, 12) -> (4, 54)",
+  "(5, 14) -> (4, 56)",
+  "(5, 18) -> (4, 60)",
+  "(5, 19) -> (4, 61)",
+  "(5, 25) -> (4, 67)",
+  "(5, 26) -> (4, 68)",
+  "(5, 27) -> (4, 69)",
+  "(6, 2) -> (5, 8)",
+  "(7, 2) -> (6, 8)",
+  "(8, 2) -> (7, 8)",
+  "(8, 5) -> (7, 11)",
+  "(8, 7) -> (7, 13)",
+  "(9, 2) -> (8, 8)",
+  "(9, 9) -> (8, 15)",
+  "(10, 2) -> (9, 8)",
+  "(10, 7) -> (9, 13)",
+  "(10, 8) -> (9, 14)",
+  "(10, 10) -> (9, 16)",
+  "(11, 4) -> (10, 10)",
+  "(11, 11) -> (10, 17)",
+  "(11, 15) -> (10, 21)",
+  "(11, 16) -> (10, 22)",
+  "(11, 18) -> (10, 24)",
+  "(12, 2) -> (11, 8)",
+  "(13, 2) -> (12, 8)",
+  "(13, 8) -> (12, 14)",
+  "(13, 9) -> (12, 15)",
+  "(13, 11) -> (12, 17)",
+  "(14, 4) -> (13, 10)",
+  "(14, 11) -> (13, 17)",
+  "(14, 15) -> (13, 21)",
+  "(14, 16) -> (13, 22)",
+  "(14, 21) -> (13, 27)",
+  "(14, 22) -> (13, 28)",
+  "(14, 24) -> (13, 29)",
+  "(14, 26) -> (13, 30)",
+  "(14, 30) -> (13, 34)",
+  "(14, 31) -> (14, 12)",
+  "(15, 2) -> (15, 8)",
+  "(16, 0) -> (16, 6)",
+]
+`;
+
+exports[`Regexp 1`] = `
+"var r = /foobar/g;
+"
+`;
+
+exports[`Regexp 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 17) -> (1, 15)",
+]
+`;
+
+exports[`Simple function 1`] = `
+"function foo() {
+  bar();
+}
+"
+`;
+
+exports[`Simple function 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 9) -> (1, 9)",
+  "(1, 12) -> (1, 12)",
+  "(1, 13) -> (1, 13)",
+  "(1, 15) -> (1, 15)",
+  "(2, 2) -> (1, 17)",
+  "(2, 5) -> (1, 20)",
+  "(2, 6) -> (1, 21)",
+  "(2, 7) -> (1, 22)",
+  "(3, 0) -> (1, 24)",
+]
+`;
+
+exports[`Single line comment 1`] = `
+"// Comment
+function foo() {
+  bar();
+}
+"
+`;
+
+exports[`Single line comment 2`] = `
+Array [
+  "(2, 0) -> (3, 4)",
+  "(2, 9) -> (3, 13)",
+  "(2, 12) -> (3, 16)",
+  "(2, 13) -> (3, 17)",
+  "(2, 15) -> (3, 19)",
+  "(3, 2) -> (3, 21)",
+  "(3, 5) -> (3, 24)",
+  "(3, 6) -> (3, 25)",
+  "(3, 7) -> (3, 26)",
+  "(4, 0) -> (3, 28)",
+]
+`;
+
+exports[`Stack-keyword property access 1`] = `
+"foo.a = 1.1;
+foo.do.switch.case.default = 2.2;
+foo.b = 3.3;
+"
+`;
+
+exports[`Stack-keyword property access 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 3) -> (1, 3)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 11) -> (1, 9)",
+  "(2, 0) -> (1, 10)",
+  "(2, 3) -> (1, 13)",
+  "(2, 4) -> (1, 14)",
+  "(2, 6) -> (1, 16)",
+  "(2, 7) -> (1, 17)",
+  "(2, 13) -> (1, 23)",
+  "(2, 14) -> (1, 24)",
+  "(2, 18) -> (1, 28)",
+  "(2, 19) -> (1, 29)",
+  "(2, 27) -> (1, 36)",
+  "(2, 29) -> (1, 37)",
+  "(2, 32) -> (1, 40)",
+  "(3, 0) -> (1, 41)",
+  "(3, 3) -> (1, 44)",
+  "(3, 4) -> (1, 45)",
+  "(3, 6) -> (1, 46)",
+  "(3, 8) -> (1, 47)",
+  "(3, 11) -> (1, 50)",
+]
+`;
+
+exports[`String with quote 1`] = `
+"var foo = '\\\\'';
+"
+`;
+
+exports[`String with quote 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 8)",
+  "(1, 10) -> (1, 10)",
+  "(1, 14) -> (1, 13)",
+]
+`;
+
+exports[`String with semicolon 1`] = `
+"var foo = ';';
+"
+`;
+
+exports[`String with semicolon 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 8)",
+  "(1, 10) -> (1, 10)",
+  "(1, 13) -> (1, 13)",
+]
+`;
+
+exports[`Subclass handling 1`] = `
+"class Class extends Base {
+  constructor() {
+  }
+}
+"
+`;
+
+exports[`Subclass handling 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 6) -> (1, 7)",
+  "(1, 12) -> (1, 14)",
+  "(1, 20) -> (1, 23)",
+  "(1, 25) -> (1, 27)",
+  "(2, 2) -> (1, 28)",
+  "(2, 13) -> (1, 39)",
+  "(2, 14) -> (1, 40)",
+  "(2, 16) -> (1, 41)",
+  "(3, 2) -> (1, 42)",
+  "(4, 0) -> (1, 43)",
+]
+`;
+
+exports[`Switch statements 1`] = `
+"switch (x) {
+  case a:
+    foo();
+    break;
+  default:
+    bar()
+}
+"
+`;
+
+exports[`Switch statements 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 7) -> (1, 6)",
+  "(1, 8) -> (1, 7)",
+  "(1, 9) -> (1, 8)",
+  "(1, 11) -> (1, 9)",
+  "(2, 2) -> (1, 10)",
+  "(2, 7) -> (1, 15)",
+  "(2, 8) -> (1, 16)",
+  "(3, 4) -> (1, 17)",
+  "(3, 7) -> (1, 20)",
+  "(3, 8) -> (1, 21)",
+  "(3, 9) -> (1, 22)",
+  "(4, 4) -> (1, 23)",
+  "(4, 9) -> (1, 28)",
+  "(5, 2) -> (1, 29)",
+  "(5, 9) -> (1, 36)",
+  "(6, 4) -> (1, 37)",
+  "(6, 7) -> (1, 40)",
+  "(6, 8) -> (1, 41)",
+  "(7, 0) -> (1, 42)",
+]
+`;
+
+exports[`Template literals 1`] = `
+"\`abc\${ JSON.stringify({
+  clas: 'testing'
+}) }def\`;
+{
+  a();
+}
+"
+`;
+
+exports[`Template literals 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 1) -> (1, 1)",
+  "(1, 4) -> (1, 4)",
+  "(1, 7) -> (1, 6)",
+  "(1, 11) -> (1, 10)",
+  "(1, 12) -> (1, 11)",
+  "(1, 21) -> (1, 20)",
+  "(1, 22) -> (1, 21)",
+  "(2, 2) -> (1, 22)",
+  "(2, 6) -> (1, 26)",
+  "(2, 8) -> (1, 28)",
+  "(3, 0) -> (1, 37)",
+  "(3, 1) -> (1, 38)",
+  "(3, 3) -> (1, 39)",
+  "(3, 4) -> (1, 40)",
+  "(3, 7) -> (1, 43)",
+  "(3, 8) -> (1, 44)",
+  "(4, 0) -> (1, 45)",
+  "(5, 2) -> (1, 46)",
+  "(5, 3) -> (1, 47)",
+  "(5, 4) -> (1, 48)",
+  "(5, 5) -> (1, 49)",
+  "(6, 0) -> (1, 50)",
+]
+`;
+
+exports[`Ternary operator 1`] = `
+"bar ? baz : bang;
+"
+`;
+
+exports[`Ternary operator 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 3)",
+  "(1, 6) -> (1, 4)",
+  "(1, 10) -> (1, 7)",
+  "(1, 12) -> (1, 8)",
+  "(1, 16) -> (1, 12)",
+]
+`;
+
+exports[`This property access 1`] = `
+"var foo = this.foo;
+"
+`;
+
+exports[`This property access 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(1, 14) -> (1, 12)",
+  "(1, 15) -> (1, 13)",
+  "(1, 18) -> (1, 16)",
+]
+`;
+
+exports[`True assignment 1`] = `
+"var foo = true;
+"
+`;
+
+exports[`True assignment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 8) -> (1, 7)",
+  "(1, 10) -> (1, 8)",
+  "(1, 14) -> (1, 12)",
+]
+`;
+
+exports[`Try/catch/finally statement 1`] = `
+"try {
+  dangerous()
+} catch (e) {
+  handle(e)
+} finally {
+  cleanup()
+}
+"
+`;
+
+exports[`Try/catch/finally statement 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 3)",
+  "(2, 2) -> (1, 4)",
+  "(2, 11) -> (1, 13)",
+  "(2, 12) -> (1, 14)",
+  "(3, 0) -> (1, 15)",
+  "(3, 2) -> (1, 16)",
+  "(3, 8) -> (1, 21)",
+  "(3, 9) -> (1, 22)",
+  "(3, 10) -> (1, 23)",
+  "(3, 12) -> (1, 24)",
+  "(4, 2) -> (1, 25)",
+  "(4, 8) -> (1, 31)",
+  "(4, 9) -> (1, 32)",
+  "(4, 10) -> (1, 33)",
+  "(5, 0) -> (1, 34)",
+  "(5, 2) -> (1, 35)",
+  "(5, 10) -> (1, 42)",
+  "(6, 2) -> (1, 43)",
+  "(6, 9) -> (1, 50)",
+  "(6, 10) -> (1, 51)",
+  "(7, 0) -> (1, 52)",
+]
+`;
+
+exports[`Undefined assignment 1`] = `
+"var i = undefined;
+"
+`;
+
+exports[`Undefined assignment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 17) -> (1, 15)",
+]
+`;
+
+exports[`Unnamed class handling 1`] = `
+"let unnamed = class {
+  constructor() {
+  }
+}
+"
+`;
+
+exports[`Unnamed class handling 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 12) -> (1, 11)",
+  "(1, 14) -> (1, 12)",
+  "(1, 20) -> (1, 17)",
+  "(2, 2) -> (1, 18)",
+  "(2, 13) -> (1, 29)",
+  "(2, 14) -> (1, 30)",
+  "(2, 16) -> (1, 31)",
+  "(3, 2) -> (1, 32)",
+  "(4, 0) -> (1, 33)",
+]
+`;
+
+exports[`Void 0 assignment 1`] = `
+"var i = void 0;
+"
+`;
+
+exports[`Void 0 assignment 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 8) -> (1, 6)",
+  "(1, 13) -> (1, 11)",
+  "(1, 14) -> (1, 12)",
+]
+`;
+
+exports[`With statement 1`] = `
+"with (obj) {
+  crock()
+}
+"
+`;
+
+exports[`With statement 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 5) -> (1, 4)",
+  "(1, 6) -> (1, 5)",
+  "(1, 9) -> (1, 8)",
+  "(1, 11) -> (1, 9)",
+  "(2, 2) -> (1, 10)",
+  "(2, 7) -> (1, 15)",
+  "(2, 8) -> (1, 16)",
+  "(3, 0) -> (1, 17)",
+]
+`;
+
+exports[`for..of loop 1`] = `
+"for (const x of [
+  1,
+  2,
+  3
+]) {
+  console.log(x)
+}
+"
+`;
+
+exports[`for..of loop 2`] = `
+Array [
+  "(1, 0) -> (1, 0)",
+  "(1, 4) -> (1, 4)",
+  "(1, 5) -> (1, 5)",
+  "(1, 11) -> (1, 11)",
+  "(1, 13) -> (1, 13)",
+  "(1, 16) -> (1, 16)",
+  "(2, 2) -> (1, 17)",
+  "(2, 3) -> (1, 18)",
+  "(3, 2) -> (1, 19)",
+  "(3, 3) -> (1, 20)",
+  "(4, 2) -> (1, 21)",
+  "(5, 0) -> (1, 22)",
+  "(5, 1) -> (1, 23)",
+  "(5, 3) -> (1, 25)",
+  "(6, 2) -> (1, 27)",
+  "(6, 9) -> (1, 34)",
+  "(6, 10) -> (1, 35)",
+  "(6, 13) -> (1, 38)",
+  "(6, 14) -> (1, 39)",
+  "(6, 15) -> (1, 40)",
+  "(7, 0) -> (1, 42)",
+]
+`;
diff --git a/devtools/client/debugger/src/workers/pretty-print/tests/prettyFast.spec.js b/devtools/client/debugger/src/workers/pretty-print/tests/prettyFast.spec.js
new file mode 100644
index 0000000000..b9c19093ad
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/tests/prettyFast.spec.js
@@ -0,0 +1,435 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+/*
+ * Copyright 2013 Mozilla Foundation and contributors
+ * Licensed under the New BSD license. See LICENSE.md or:
+ * http://opensource.org/licenses/BSD-2-Clause
+ */
+import { prettyFast } from "../pretty-fast";
+import { SourceMapConsumer } from "devtools/client/shared/vendor/source-map/source-map";
+
+const cases = [
+  {
+    name: "Simple function",
+    input: "function foo() { bar(); }",
+  },
+  {
+    name: "Nested function",
+    input: "function foo() { function bar() { debugger; } bar(); }",
+  },
+  {
+    name: "Immediately invoked function expression",
+    input: "(function(){thingy()}())",
+  },
+  {
+    name: "Single line comment",
+    input: `
+    // Comment
+    function foo() { bar(); }`,
+  },
+  {
+    name: "Multi line comment",
+    input: `
+    /* Comment
+    more comment */
+    function foo() { bar(); }
+    `,
+  },
+  { name: "Null assignment", input: "var i=null;" },
+  { name: "Undefined assignment", input: "var i=undefined;" },
+  { name: "Void 0 assignment", input: "var i=void 0;" },
+  {
+    name: "This property access",
+    input: "var foo=this.foo;\n",
+  },
+
+  {
+    name: "True assignment",
+    input: "var foo=true;\n",
+  },
+
+  {
+    name: "False assignment",
+    input: "var foo=false;\n",
+  },
+
+  {
+    name: "For loop",
+    input: "for (var i = 0; i < n; i++) { console.log(i); }",
+  },
+
+  {
+    name: "for..of loop",
+    input: "for (const x of [1,2,3]) { console.log(x) }",
+  },
+
+  {
+    name: "String with semicolon",
+    input: "var foo = ';';\n",
+  },
+
+  {
+    name: "String with quote",
+    input: 'var foo = "\'";\n',
+  },
+
+  {
+    name: "Function calls",
+    input: "var result=func(a,b,c,d);",
+  },
+
+  {
+    name: "Regexp",
+    input: "var r=/foobar/g;",
+  },
+
+  {
+    name: "In operator",
+    input: "if(foo in bar){doThing()}",
+    output: "if (foo in bar) {\n" + "  doThing()\n" + "}\n",
+  },
+  {
+    name: "With statement",
+    input: "with(obj){crock()}",
+  },
+  {
+    name: "New expression",
+    input: "var foo=new Foo();",
+  },
+  {
+    name: "Continue/break statements",
+    input: "while(1){if(x){continue}if(y){break}if(z){break foo}}",
+  },
+  {
+    name: "Instanceof",
+    input: "var a=x instanceof y;",
+  },
+  {
+    name: "Binary operators",
+    input: "var a=5*30;var b=5>>3;",
+  },
+  {
+    name: "Delete",
+    input: "delete obj.prop;",
+  },
+
+  {
+    name: "Try/catch/finally statement",
+    input: "try{dangerous()}catch(e){handle(e)}finally{cleanup()}",
+  },
+  {
+    name: "If/else statement",
+    input: "if(c){then()}else{other()}",
+  },
+  {
+    name: "If/else without curlies",
+    input: "if(c) a else b",
+  },
+  {
+    name: "Objects",
+    input: `
+      var o={a:1,
+      b:2};`,
+  },
+  {
+    name: "Do/while loop",
+    input: "do{x}while(y)",
+  },
+  {
+    name: "Arrays",
+    input: "var a=[1,2,3];",
+  },
+  {
+    name: "Arrays and spread operator",
+    input: "var a=[1,...[2,3],...[], 4];",
+  },
+  {
+    name: "Empty object/array literals",
+    input: `let a=[];const b={};c={...{},d: 42};for(let x of []){for(let y in {}){}}`,
+  },
+  {
+    name: "Code that relies on ASI",
+    input: `
+           var foo = 10
+           var bar = 20
+           function g() {
+             a()
+             b()
+           }`,
+  },
+  {
+    name: "Ternary operator",
+    input: "bar?baz:bang;",
+  },
+  {
+    name: "Switch statements",
+    input: "switch(x){case a:foo();break;default:bar()}",
+  },
+
+  {
+    name: "Multiple single line comments",
+    input: `function f() {
+             // a
+             // b
+             // c
+           }`,
+  },
+  {
+    name: "Indented multiline comment",
+    input: `function foo() {
+             /**
+              * java doc style comment
+              * more comment
+              */
+             bar();
+           }`,
+  },
+  {
+    name: "ASI return",
+    input: `function f() {
+             return
+             {}
+           }`,
+  },
+  {
+    name: "Non-ASI property access",
+    input: `[1,2,3]
+           [0]`,
+  },
+  {
+    name: "Non-ASI in",
+    input: `'x'
+           in foo`,
+  },
+
+  {
+    name: "Non-ASI function call",
+    input: `f
+           ()`,
+  },
+  {
+    name: "Non-ASI new",
+    input: `new
+           F()`,
+  },
+  {
+    name: "Getter and setter literals",
+    input: "var obj={get foo(){return this._foo},set foo(v){this._foo=v}}",
+  },
+  {
+    name: "Escaping backslashes in strings",
+    input: "'\\\\'\n",
+  },
+  {
+    name: "Escaping carriage return in strings",
+    input: "'\\r'\n",
+  },
+  {
+    name: "Escaping tab in strings",
+    input: "'\\t'\n",
+  },
+  {
+    name: "Escaping vertical tab in strings",
+    input: "'\\v'\n",
+  },
+  {
+    name: "Escaping form feed in strings",
+    input: "'\\f'\n",
+  },
+  {
+    name: "Escaping null character in strings",
+    input: "'\\0'\n",
+  },
+  {
+    name: "Bug 977082 - space between grouping operator and dot notation",
+    input: `JSON.stringify(3).length;
+           ([1,2,3]).length;
+           (new Date()).toLocaleString();`,
+  },
+  {
+    name: "Bug 975477 don't move end of line comments to next line",
+    input: `switch (request.action) {
+             case 'show': //$NON-NLS-0$
+               if (localStorage.hideicon !== 'true') { //$NON-NLS-0$
+                 chrome.pageAction.show(sender.tab.id);
+               }
+               break;
+             case 'hide': /*Multiline
+               Comment */
+               break;
+             default:
+               console.warn('unknown request'); //$NON-NLS-0$
+               // don't respond if you don't understand the message.
+               return;
+           }`,
+  },
+  {
+    name: "Const handling",
+    input: "const d = 'yes';\n",
+  },
+  {
+    name: "Let handling without value",
+    input: "let d;\n",
+  },
+  {
+    name: "Let handling with value",
+    input: "let d = 'yes';\n",
+  },
+  {
+    name: "Template literals",
+    // issue in acorn
+    input: "`abc${JSON.stringify({clas: 'testing'})}def`;{a();}",
+  },
+  {
+    name: "Class handling",
+    input: "class  Class{constructor(){}}",
+  },
+  {
+    name: "Subclass handling",
+    input: "class  Class  extends  Base{constructor(){}}",
+  },
+  {
+    name: "Unnamed class handling",
+    input: "let unnamed=class{constructor(){}}",
+  },
+  {
+    name: "Named class handling",
+    input: "let unnamed=class Class{constructor(){}}",
+  },
+  {
+    name: "Class extension within a function",
+    input: "(function() {  class X extends Y { constructor() {} }  })()",
+  },
+  {
+    name: "Bug 1261971 - indentation after switch statement",
+    input: "{switch(x){}if(y){}done();}",
+  },
+  {
+    name: "Bug 1206633 - spaces in for of",
+    input: "for (let tab of tabs) {}",
+  },
+  {
+    name: "Bug pretty-sure-3 - escaping line and paragraph separators",
+    input: "x = '\\u2029\\u2028';",
+  },
+  {
+    name: "Bug pretty-sure-4 - escaping null character before digit",
+    input: "x = '\\u00001';",
+  },
+  {
+    name: "Bug pretty-sure-5 - empty multiline comment shouldn't throw exception",
+    input: `{
+           /*
+           */
+             return;
+           }`,
+  },
+  {
+    name: "Bug pretty-sure-6 - inline comment shouldn't move parenthesis to next line",
+    input: `return /* inline comment */ (
+             1+1);`,
+  },
+  {
+    name: "Bug pretty-sure-7 - accessing a literal number property requires a space",
+    input: "0..toString()+x.toString();",
+  },
+  {
+    name: "Bug pretty-sure-8 - return and yield only accept arguments when on the same line",
+    input: `{
+             return
+             (x)
+             yield
+             (x)
+             yield
+             *x
+           }`,
+  },
+  {
+    name: "Bug pretty-sure-9 - accept unary operator at start of file",
+    input: "+ 0",
+  },
+  {
+    name: "Stack-keyword property access",
+    input: "foo.a=1.1;foo.do.switch.case.default=2.2;foo.b=3.3;\n",
+  },
+  {
+    name: "Dot handling with let which is identifier name",
+    input: "y.let.let = 1.23;\n",
+  },
+  {
+    name: "Dot handling with keywords which are identifier name",
+    input: "y.await.break.const.delete.else.return.new.yield = 1.23;\n",
+  },
+  {
+    name: "Optional chaining parsing support",
+    input: "x?.y?.z?.['a']?.check();\n",
+  },
+  {
+    name: "Private fields parsing support",
+    input: `
+      class MyClass {
+        constructor(a) {
+          this.#a = a;this.#b = Math.random();this.ab = this.#getAB();
+        }
+        #a
+        #b = "default value"
+        static #someStaticPrivate
+        #getA() {
+          return this.#a;
+        }
+        #getAB() {
+          return this.#getA()+this.
+            #b
+        }
+      }
+    `,
+  },
+  {
+    name: "Long parenthesis",
+    input: `
+      if (thisIsAVeryLongVariable && thisIsAnotherOne || yetAnotherVeryLongVariable) {
+        (thisIsAnotherOne = thisMayReturnNull() || "hi", thisIsAVeryLongVariable = 42, yetAnotherVeryLongVariable && doSomething(true /* do it well */,thisIsAVeryLongVariable, thisIsAnotherOne, yetAnotherVeryLongVariable))
+      }
+      for (let thisIsAnotherVeryLongVariable = 0; i < thisIsAnotherVeryLongVariable.length; thisIsAnotherVeryLongVariable++) {}
+      const x = ({thisIsAnotherVeryLongPropertyName: "but should not cause the paren to be a line delimiter"})
+    `,
+  },
+  {
+    name: "Fat arrow function",
+    input: `
+      const a = () => 42
+      addEventListener("click", e => { return false });
+      const sum = (c,d) => c+d
+    `,
+  },
+];
+
+const includesOnly = cases.find(({ only }) => only);
+
+for (const { name, input, only, skip } of cases) {
+  if ((includesOnly && !only) || skip) {
+    continue;
+  }
+  // Wrapping name into a string to avoid jest/valid-title failures
+  test(`${name}`, async () => {
+    const actual = prettyFast(input, {
+      indent: "  ",
+      url: "test.js",
+    });
+
+    expect(actual.code).toMatchSnapshot();
+
+    const smc = await new SourceMapConsumer(actual.map.toJSON());
+    const mappings = [];
+    smc.eachMapping(
+      ({ generatedColumn, generatedLine, originalColumn, originalLine }) => {
+        mappings.push(
+          `(${originalLine}, ${originalColumn}) -> (${generatedLine}, ${generatedColumn})`
+        );
+      }
+    );
+    expect(mappings).toMatchSnapshot();
+  });
+}
diff --git a/devtools/client/debugger/src/workers/pretty-print/worker.js b/devtools/client/debugger/src/workers/pretty-print/worker.js
new file mode 100644
index 0000000000..1c5587db9f
--- /dev/null
+++ b/devtools/client/debugger/src/workers/pretty-print/worker.js
@@ -0,0 +1,98 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { workerHandler } from "../../../../shared/worker-utils";
+import { prettyFast } from "./pretty-fast";
+
+var { SourceMapGenerator } = require("source-map");
+
+const sourceMapGeneratorByTaskId = new Map();
+
+function prettyPrint({ url, indent, sourceText }) {
+  const { code, map: sourceMapGenerator } = prettyFast(sourceText, {
+    url,
+    indent,
+  });
+
+  return {
+    code,
+    sourceMap: sourceMapGenerator.toJSON(),
+  };
+}
+
+function prettyPrintInlineScript({
+  taskId,
+  url,
+  indent,
+  sourceText,
+  originalStartLine,
+  originalStartColumn,
+  generatedStartLine,
+}) {
+  let taskSourceMapGenerator;
+  if (!sourceMapGeneratorByTaskId.has(taskId)) {
+    taskSourceMapGenerator = new SourceMapGenerator({ file: url });
+    sourceMapGeneratorByTaskId.set(taskId, taskSourceMapGenerator);
+  } else {
+    taskSourceMapGenerator = sourceMapGeneratorByTaskId.get(taskId);
+  }
+
+  const { code } = prettyFast(sourceText, {
+    url,
+    indent,
+    sourceMapGenerator: taskSourceMapGenerator,
+    /*
+     * By default prettyPrint will trim the text, and we'd have the pretty text displayed
+     * just after the script tag, e.g.:
+     *
+     * ```
+     * <script>if (true) {
+     *   something()
+     * }
+     * </script>
+     * ```
+     *
+     * We want the text to start on a new line, so prepend a line break, so we get
+     * something like:
+     *
+     * ```
+     * <script>
+     * if (true) {
+     *   something()
+     * }
+     * </script>
+     * ```
+     */
+    prefixWithNewLine: true,
+    originalStartLine,
+    originalStartColumn,
+    generatedStartLine,
+  });
+
+  // When a taskId was passed, we only return the pretty printed text.
+  // The source map should be retrieved with getSourceMapForTask.
+  return code;
+}
+
+/**
+ * Get the source map for a pretty-print task
+ *
+ * @param {Integer} taskId: The taskId that was used to call prettyPrint
+ * @returns {Object} A source map object
+ */
+function getSourceMapForTask(taskId) {
+  if (!sourceMapGeneratorByTaskId.has(taskId)) {
+    return null;
+  }
+
+  const taskSourceMapGenerator = sourceMapGeneratorByTaskId.get(taskId);
+  sourceMapGeneratorByTaskId.delete(taskId);
+  return taskSourceMapGenerator.toJSON();
+}
+
+self.onmessage = workerHandler({
+  prettyPrint,
+  prettyPrintInlineScript,
+  getSourceMapForTask,
+});
diff --git a/devtools/client/debugger/src/workers/search/get-matches.js b/devtools/client/debugger/src/workers/search/get-matches.js
new file mode 100644
index 0000000000..972dea6818
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/get-matches.js
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import assert from "../../utils/assert";
+import buildQuery from "../../utils/build-query";
+
+export default function getMatches(query, text, options) {
+  if (!query || !text || !options) {
+    return [];
+  }
+  const regexQuery = buildQuery(query, options, {
+    isGlobal: true,
+  });
+  const matchedLocations = [];
+  const lines = text.split("\n");
+  for (let i = 0; i < lines.length; i++) {
+    let singleMatch;
+    const line = lines[i];
+    while ((singleMatch = regexQuery.exec(line)) !== null) {
+      // Flow doesn't understand the test above.
+      if (!singleMatch) {
+        throw new Error("no singleMatch");
+      }
+
+      matchedLocations.push({
+        line: i,
+        ch: singleMatch.index,
+        match: singleMatch[0],
+      });
+
+      // When the match is an empty string the regexQuery.lastIndex will not
+      // change resulting in an infinite loop so we need to check for this and
+      // increment it manually in that case.  See issue #7023
+      if (singleMatch[0] === "") {
+        assert(
+          !regexQuery.unicode,
+          "lastIndex++ can cause issues in unicode mode"
+        );
+        regexQuery.lastIndex++;
+      }
+    }
+  }
+  return matchedLocations;
+}
diff --git a/devtools/client/debugger/src/workers/search/index.js b/devtools/client/debugger/src/workers/search/index.js
new file mode 100644
index 0000000000..928bbf50e6
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/index.js
@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { WorkerDispatcher } from "devtools/client/shared/worker-utils";
+
+const WORKER_URL = "resource://devtools/client/debugger/dist/search-worker.js";
+
+export class SearchDispatcher extends WorkerDispatcher {
+  constructor(jestUrl) {
+    super(jestUrl || WORKER_URL);
+  }
+
+  getMatches = this.task("getMatches");
+
+  findSourceMatches = this.task("findSourceMatches");
+}
diff --git a/devtools/client/debugger/src/workers/search/moz.build b/devtools/client/debugger/src/workers/search/moz.build
new file mode 100644
index 0000000000..b7223ac81a
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/moz.build
@@ -0,0 +1,10 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += []
+
+CompiledModules(
+    "index.js",
+)
diff --git a/devtools/client/debugger/src/workers/search/project-search.js b/devtools/client/debugger/src/workers/search/project-search.js
new file mode 100644
index 0000000000..f3751b57c4
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/project-search.js
@@ -0,0 +1,70 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// Maybe reuse file search's functions?
+
+import getMatches from "./get-matches";
+
+export function findSourceMatches(content, queryText, options) {
+  if (queryText == "") {
+    return [];
+  }
+
+  const text = content.value;
+  const lines = text.split("\n");
+
+  return getMatches(queryText, text, options).map(({ line, ch, match }) => {
+    const { value, matchIndex } = truncateLine(lines[line], ch);
+    return {
+      line: line + 1,
+      column: ch,
+
+      matchIndex,
+      match,
+      value,
+    };
+  });
+}
+
+// This is used to find start of a word, so that cropped string look nice
+const startRegex = /([ !@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?])/g;
+// Similarly, find
+const endRegex = new RegExp(
+  [
+    "([ !@#$%^&*()_+-=[]{};':\"\\|,.<>/?])",
+    '[^ !@#$%^&*()_+-=[]{};\':"\\|,.<>/?]*$"/',
+  ].join("")
+);
+// For texts over 100 characters this truncates the text (for display)
+// around the context of the matched text.
+function truncateLine(text, column) {
+  if (text.length < 100) {
+    return {
+      matchIndex: column,
+      value: text,
+    };
+  }
+
+  // Initially take 40 chars left to the match
+  const offset = Math.max(column - 40, 0);
+  // 400 characters should be enough to figure out the context of the match
+  const truncStr = text.slice(offset, column + 400);
+  let start = truncStr.search(startRegex);
+  let end = truncStr.search(endRegex);
+
+  if (start > column) {
+    // No word separator found before the match, so we take all characters
+    // before the match
+    start = -1;
+  }
+  if (end < column) {
+    end = truncStr.length;
+  }
+  const value = truncStr.slice(start + 1, end);
+
+  return {
+    matchIndex: column - start - offset - 1,
+    value,
+  };
+}
diff --git a/devtools/client/debugger/src/workers/search/tests/get-matches.spec.js b/devtools/client/debugger/src/workers/search/tests/get-matches.spec.js
new file mode 100644
index 0000000000..30b0ce316d
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/tests/get-matches.spec.js
@@ -0,0 +1,99 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import getMatches from "../get-matches";
+
+describe("search", () => {
+  describe("getMatches", () => {
+    it("gets basic string match", () => {
+      const text = "the test string with test in it multiple times test.";
+      const query = "test";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      });
+      expect(matchLocations).toHaveLength(3);
+    });
+
+    it("gets basic string match case-sensitive", () => {
+      const text = "the Test string with test in it multiple times test.";
+      const query = "Test";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      });
+      expect(matchLocations).toHaveLength(1);
+    });
+
+    it("gets whole word string match", () => {
+      const text = "the test string test in it multiple times whoatestthe.";
+      const query = "test";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: false,
+      });
+      expect(matchLocations).toHaveLength(2);
+    });
+
+    it("gets regex match", () => {
+      const text = "the test string test in it multiple times whoatestthe.";
+      const query = "(\\w+)\\s+(\\w+)";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: true,
+      });
+      expect(matchLocations).toHaveLength(4);
+    });
+
+    it("doesnt fail on empty data", () => {
+      const text = "";
+      const query = "";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: true,
+      });
+      expect(matchLocations).toHaveLength(0);
+    });
+
+    it("fails gracefully when the line is too long", () => {
+      const text = Array(100002).join("x");
+      const query = "query";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: true,
+      });
+      expect(matchLocations).toHaveLength(0);
+    });
+
+    // regression test for #6896
+    it("doesn't crash on the regex 'a*'", () => {
+      const text = "abc";
+      const query = "a*";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: true,
+      });
+      expect(matchLocations).toHaveLength(4);
+    });
+
+    // regression test for #6896
+    it("doesn't crash on the regex '^'", () => {
+      const text = "012";
+      const query = "^";
+      const matchLocations = getMatches(query, text, {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: true,
+      });
+      expect(matchLocations).toHaveLength(1);
+    });
+  });
+});
diff --git a/devtools/client/debugger/src/workers/search/worker.js b/devtools/client/debugger/src/workers/search/worker.js
new file mode 100644
index 0000000000..b452697516
--- /dev/null
+++ b/devtools/client/debugger/src/workers/search/worker.js
@@ -0,0 +1,9 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import getMatches from "./get-matches";
+import { findSourceMatches } from "./project-search";
+import { workerHandler } from "../../../../shared/worker-utils";
+
+self.onmessage = workerHandler({ getMatches, findSourceMatches });