Adding upstream version 5.28.2+dfsg1+~cs23.11.12.3.upstream/5.28.2+dfsg1+_cs23.11.12.3upstream

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

4 files changed, 3830 insertions, 0 deletions

diff --git a/test/wpt/tests/resources/webidl2/lib/README.md b/test/wpt/tests/resources/webidl2/lib/README.md
new file mode 100644
index 0000000..1bd5832
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/README.md
@@ -0,0 +1,4 @@
+This directory contains a built version of the [webidl2.js library](https://github.com/w3c/webidl2.js).
+It is built by running `npm run build-debug` at the root of that repository.
+
+The `webidl2.js.headers` file is a local addition to ensure the script is interpreted as UTF-8.
diff --git a/test/wpt/tests/resources/webidl2/lib/VERSION.md b/test/wpt/tests/resources/webidl2/lib/VERSION.md
new file mode 100644
index 0000000..5a3726c
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/VERSION.md
@@ -0,0 +1 @@
+Currently using webidl2.js@6889aee6fc7d65915ab1267825248157dbc50486.
diff --git a/test/wpt/tests/resources/webidl2/lib/webidl2.js b/test/wpt/tests/resources/webidl2/lib/webidl2.js
new file mode 100644
index 0000000..7161def
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/webidl2.js
@@ -0,0 +1,3824 @@
+(function webpackUniversalModuleDefinition(root, factory) {
+	if(typeof exports === 'object' && typeof module === 'object')
+		module.exports = factory();
+	else if(typeof define === 'function' && define.amd)
+		define([], factory);
+	else if(typeof exports === 'object')
+		exports["WebIDL2"] = factory();
+	else
+		root["WebIDL2"] = factory();
+})(globalThis, () => {
+return /******/ (() => { // webpackBootstrap
+/******/ 	"use strict";
+/******/ 	var __webpack_modules__ = ([
+/* 0 */,
+/* 1 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "parse": () => (/* binding */ parse)
+/* harmony export */ });
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(2);
+/* harmony import */ var _productions_enum_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(15);
+/* harmony import */ var _productions_includes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(16);
+/* harmony import */ var _productions_extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(8);
+/* harmony import */ var _productions_typedef_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(17);
+/* harmony import */ var _productions_callback_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(18);
+/* harmony import */ var _productions_interface_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(19);
+/* harmony import */ var _productions_mixin_js__WEBPACK_IMPORTED_MODULE_7__ = __webpack_require__(25);
+/* harmony import */ var _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__ = __webpack_require__(26);
+/* harmony import */ var _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__ = __webpack_require__(28);
+/* harmony import */ var _productions_callback_interface_js__WEBPACK_IMPORTED_MODULE_10__ = __webpack_require__(29);
+/* harmony import */ var _productions_helpers_js__WEBPACK_IMPORTED_MODULE_11__ = __webpack_require__(4);
+/* harmony import */ var _productions_token_js__WEBPACK_IMPORTED_MODULE_12__ = __webpack_require__(10);
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * @param {Tokeniser} tokeniser
+ * @param {object} options
+ * @param {boolean} [options.concrete]
+ * @param {Function[]} [options.productions]
+ */
+function parseByTokens(tokeniser, options) {
+  const source = tokeniser.source;
+
+  function error(str) {
+    tokeniser.error(str);
+  }
+
+  function consume(...candidates) {
+    return tokeniser.consume(...candidates);
+  }
+
+  function callback() {
+    const callback = consume("callback");
+    if (!callback) return;
+    if (tokeniser.probe("interface")) {
+      return _productions_callback_interface_js__WEBPACK_IMPORTED_MODULE_10__.CallbackInterface.parse(tokeniser, callback);
+    }
+    return _productions_callback_js__WEBPACK_IMPORTED_MODULE_5__.CallbackFunction.parse(tokeniser, callback);
+  }
+
+  function interface_(opts) {
+    const base = consume("interface");
+    if (!base) return;
+    const ret =
+      _productions_mixin_js__WEBPACK_IMPORTED_MODULE_7__.Mixin.parse(tokeniser, base, opts) ||
+      _productions_interface_js__WEBPACK_IMPORTED_MODULE_6__.Interface.parse(tokeniser, base, opts) ||
+      error("Interface has no proper body");
+    return ret;
+  }
+
+  function partial() {
+    const partial = consume("partial");
+    if (!partial) return;
+    return (
+      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser, { partial }) ||
+      interface_({ partial }) ||
+      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser, { partial }) ||
+      error("Partial doesn't apply to anything")
+    );
+  }
+
+  function definition() {
+    if (options.productions) {
+      for (const production of options.productions) {
+        const result = production(tokeniser);
+        if (result) {
+          return result;
+        }
+      }
+    }
+
+    return (
+      callback() ||
+      interface_() ||
+      partial() ||
+      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser) ||
+      _productions_enum_js__WEBPACK_IMPORTED_MODULE_1__.Enum.parse(tokeniser) ||
+      _productions_typedef_js__WEBPACK_IMPORTED_MODULE_4__.Typedef.parse(tokeniser) ||
+      _productions_includes_js__WEBPACK_IMPORTED_MODULE_2__.Includes.parse(tokeniser) ||
+      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser)
+    );
+  }
+
+  function definitions() {
+    if (!source.length) return [];
+    const defs = [];
+    while (true) {
+      const ea = _productions_extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__.ExtendedAttributes.parse(tokeniser);
+      const def = definition();
+      if (!def) {
+        if (ea.length) error("Stray extended attributes");
+        break;
+      }
+      (0,_productions_helpers_js__WEBPACK_IMPORTED_MODULE_11__.autoParenter)(def).extAttrs = ea;
+      defs.push(def);
+    }
+    const eof = _productions_token_js__WEBPACK_IMPORTED_MODULE_12__.Eof.parse(tokeniser);
+    if (options.concrete) {
+      defs.push(eof);
+    }
+    return defs;
+  }
+  const res = definitions();
+  if (tokeniser.position < source.length) error("Unrecognised tokens");
+  return res;
+}
+
+/**
+ * @param {string} str
+ * @param {object} [options]
+ * @param {*} [options.sourceName]
+ * @param {boolean} [options.concrete]
+ * @param {Function[]} [options.productions]
+ * @return {import("./productions/base.js").Base[]}
+ */
+function parse(str, options = {}) {
+  const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__.Tokeniser(str);
+  if (typeof options.sourceName !== "undefined") {
+    // @ts-ignore (See Tokeniser.source in supplement.d.ts)
+    tokeniser.source.name = options.sourceName;
+  }
+  return parseByTokens(tokeniser, options);
+}
+
+
+/***/ }),
+/* 2 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Tokeniser": () => (/* binding */ Tokeniser),
+/* harmony export */   "WebIDLParseError": () => (/* binding */ WebIDLParseError),
+/* harmony export */   "argumentNameKeywords": () => (/* binding */ argumentNameKeywords),
+/* harmony export */   "stringTypes": () => (/* binding */ stringTypes),
+/* harmony export */   "typeNameKeywords": () => (/* binding */ typeNameKeywords)
+/* harmony export */ });
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+/* harmony import */ var _productions_helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+// These regular expressions use the sticky flag so they will only match at
+// the current location (ie. the offset of lastIndex).
+const tokenRe = {
+  // This expression uses a lookahead assertion to catch false matches
+  // against integers early.
+  decimal:
+    /-?(?=[0-9]*\.|[0-9]+[eE])(([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([Ee][-+]?[0-9]+)?|[0-9]+[Ee][-+]?[0-9]+)/y,
+  integer: /-?(0([Xx][0-9A-Fa-f]+|[0-7]*)|[1-9][0-9]*)/y,
+  identifier: /[_-]?[A-Za-z][0-9A-Z_a-z-]*/y,
+  string: /"[^"]*"/y,
+  whitespace: /[\t\n\r ]+/y,
+  comment: /\/\/.*|\/\*[\s\S]*?\*\//y,
+  other: /[^\t\n\r 0-9A-Za-z]/y,
+};
+
+const typeNameKeywords = [
+  "ArrayBuffer",
+  "DataView",
+  "Int8Array",
+  "Int16Array",
+  "Int32Array",
+  "Uint8Array",
+  "Uint16Array",
+  "Uint32Array",
+  "Uint8ClampedArray",
+  "BigInt64Array",
+  "BigUint64Array",
+  "Float32Array",
+  "Float64Array",
+  "any",
+  "object",
+  "symbol",
+];
+
+const stringTypes = ["ByteString", "DOMString", "USVString"];
+
+const argumentNameKeywords = [
+  "async",
+  "attribute",
+  "callback",
+  "const",
+  "constructor",
+  "deleter",
+  "dictionary",
+  "enum",
+  "getter",
+  "includes",
+  "inherit",
+  "interface",
+  "iterable",
+  "maplike",
+  "namespace",
+  "partial",
+  "required",
+  "setlike",
+  "setter",
+  "static",
+  "stringifier",
+  "typedef",
+  "unrestricted",
+];
+
+const nonRegexTerminals = [
+  "-Infinity",
+  "FrozenArray",
+  "Infinity",
+  "NaN",
+  "ObservableArray",
+  "Promise",
+  "bigint",
+  "boolean",
+  "byte",
+  "double",
+  "false",
+  "float",
+  "long",
+  "mixin",
+  "null",
+  "octet",
+  "optional",
+  "or",
+  "readonly",
+  "record",
+  "sequence",
+  "short",
+  "true",
+  "undefined",
+  "unsigned",
+  "void",
+].concat(argumentNameKeywords, stringTypes, typeNameKeywords);
+
+const punctuations = [
+  "(",
+  ")",
+  ",",
+  "...",
+  ":",
+  ";",
+  "<",
+  "=",
+  ">",
+  "?",
+  "*",
+  "[",
+  "]",
+  "{",
+  "}",
+];
+
+const reserved = [
+  // "constructor" is now a keyword
+  "_constructor",
+  "toString",
+  "_toString",
+];
+
+/**
+ * @typedef {ArrayItemType<ReturnType<typeof tokenise>>} Token
+ * @param {string} str
+ */
+function tokenise(str) {
+  const tokens = [];
+  let lastCharIndex = 0;
+  let trivia = "";
+  let line = 1;
+  let index = 0;
+  while (lastCharIndex < str.length) {
+    const nextChar = str.charAt(lastCharIndex);
+    let result = -1;
+
+    if (/[\t\n\r ]/.test(nextChar)) {
+      result = attemptTokenMatch("whitespace", { noFlushTrivia: true });
+    } else if (nextChar === "/") {
+      result = attemptTokenMatch("comment", { noFlushTrivia: true });
+    }
+
+    if (result !== -1) {
+      const currentTrivia = tokens.pop().value;
+      line += (currentTrivia.match(/\n/g) || []).length;
+      trivia += currentTrivia;
+      index -= 1;
+    } else if (/[-0-9.A-Z_a-z]/.test(nextChar)) {
+      result = attemptTokenMatch("decimal");
+      if (result === -1) {
+        result = attemptTokenMatch("integer");
+      }
+      if (result === -1) {
+        result = attemptTokenMatch("identifier");
+        const lastIndex = tokens.length - 1;
+        const token = tokens[lastIndex];
+        if (result !== -1) {
+          if (reserved.includes(token.value)) {
+            const message = `${(0,_productions_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(
+              token.value
+            )} is a reserved identifier and must not be used.`;
+            throw new WebIDLParseError(
+              (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(tokens, lastIndex, null, message)
+            );
+          } else if (nonRegexTerminals.includes(token.value)) {
+            token.type = "inline";
+          }
+        }
+      }
+    } else if (nextChar === '"') {
+      result = attemptTokenMatch("string");
+    }
+
+    for (const punctuation of punctuations) {
+      if (str.startsWith(punctuation, lastCharIndex)) {
+        tokens.push({
+          type: "inline",
+          value: punctuation,
+          trivia,
+          line,
+          index,
+        });
+        trivia = "";
+        lastCharIndex += punctuation.length;
+        result = lastCharIndex;
+        break;
+      }
+    }
+
+    // other as the last try
+    if (result === -1) {
+      result = attemptTokenMatch("other");
+    }
+    if (result === -1) {
+      throw new Error("Token stream not progressing");
+    }
+    lastCharIndex = result;
+    index += 1;
+  }
+
+  // remaining trivia as eof
+  tokens.push({
+    type: "eof",
+    value: "",
+    trivia,
+    line,
+    index,
+  });
+
+  return tokens;
+
+  /**
+   * @param {keyof typeof tokenRe} type
+   * @param {object} options
+   * @param {boolean} [options.noFlushTrivia]
+   */
+  function attemptTokenMatch(type, { noFlushTrivia } = {}) {
+    const re = tokenRe[type];
+    re.lastIndex = lastCharIndex;
+    const result = re.exec(str);
+    if (result) {
+      tokens.push({ type, value: result[0], trivia, line, index });
+      if (!noFlushTrivia) {
+        trivia = "";
+      }
+      return re.lastIndex;
+    }
+    return -1;
+  }
+}
+
+class Tokeniser {
+  /**
+   * @param {string} idl
+   */
+  constructor(idl) {
+    this.source = tokenise(idl);
+    this.position = 0;
+  }
+
+  /**
+   * @param {string} message
+   * @return {never}
+   */
+  error(message) {
+    throw new WebIDLParseError(
+      (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(this.source, this.position, this.current, message)
+    );
+  }
+
+  /**
+   * @param {string} type
+   */
+  probeKind(type) {
+    return (
+      this.source.length > this.position &&
+      this.source[this.position].type === type
+    );
+  }
+
+  /**
+   * @param {string} value
+   */
+  probe(value) {
+    return (
+      this.probeKind("inline") && this.source[this.position].value === value
+    );
+  }
+
+  /**
+   * @param {...string} candidates
+   */
+  consumeKind(...candidates) {
+    for (const type of candidates) {
+      if (!this.probeKind(type)) continue;
+      const token = this.source[this.position];
+      this.position++;
+      return token;
+    }
+  }
+
+  /**
+   * @param {...string} candidates
+   */
+  consume(...candidates) {
+    if (!this.probeKind("inline")) return;
+    const token = this.source[this.position];
+    for (const value of candidates) {
+      if (token.value !== value) continue;
+      this.position++;
+      return token;
+    }
+  }
+
+  /**
+   * @param {string} value
+   */
+  consumeIdentifier(value) {
+    if (!this.probeKind("identifier")) {
+      return;
+    }
+    if (this.source[this.position].value !== value) {
+      return;
+    }
+    return this.consumeKind("identifier");
+  }
+
+  /**
+   * @param {number} position
+   */
+  unconsume(position) {
+    this.position = position;
+  }
+}
+
+class WebIDLParseError extends Error {
+  /**
+   * @param {object} options
+   * @param {string} options.message
+   * @param {string} options.bareMessage
+   * @param {string} options.context
+   * @param {number} options.line
+   * @param {*} options.sourceName
+   * @param {string} options.input
+   * @param {*[]} options.tokens
+   */
+  constructor({
+    message,
+    bareMessage,
+    context,
+    line,
+    sourceName,
+    input,
+    tokens,
+  }) {
+    super(message);
+
+    this.name = "WebIDLParseError"; // not to be mangled
+    this.bareMessage = bareMessage;
+    this.context = context;
+    this.line = line;
+    this.sourceName = sourceName;
+    this.input = input;
+    this.tokens = tokens;
+  }
+}
+
+
+/***/ }),
+/* 3 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "syntaxError": () => (/* binding */ syntaxError),
+/* harmony export */   "validationError": () => (/* binding */ validationError)
+/* harmony export */ });
+/**
+ * @param {string} text
+ */
+function lastLine(text) {
+  const splitted = text.split("\n");
+  return splitted[splitted.length - 1];
+}
+
+function appendIfExist(base, target) {
+  let result = base;
+  if (target) {
+    result += ` ${target}`;
+  }
+  return result;
+}
+
+function contextAsText(node) {
+  const hierarchy = [node];
+  while (node && node.parent) {
+    const { parent } = node;
+    hierarchy.unshift(parent);
+    node = parent;
+  }
+  return hierarchy.map((n) => appendIfExist(n.type, n.name)).join(" -> ");
+}
+
+/**
+ * @typedef {object} WebIDL2ErrorOptions
+ * @property {"error" | "warning"} [level]
+ * @property {Function} [autofix]
+ * @property {string} [ruleName]
+ *
+ * @typedef {ReturnType<typeof error>} WebIDLErrorData
+ *
+ * @param {string} message error message
+ * @param {*} position
+ * @param {*} current
+ * @param {*} message
+ * @param {"Syntax" | "Validation"} kind error type
+ * @param {WebIDL2ErrorOptions=} options
+ */
+function error(
+  source,
+  position,
+  current,
+  message,
+  kind,
+  { level = "error", autofix, ruleName } = {}
+) {
+  /**
+   * @param {number} count
+   */
+  function sliceTokens(count) {
+    return count > 0
+      ? source.slice(position, position + count)
+      : source.slice(Math.max(position + count, 0), position);
+  }
+
+  /**
+   * @param {import("./tokeniser.js").Token[]} inputs
+   * @param {object} [options]
+   * @param {boolean} [options.precedes]
+   * @returns
+   */
+  function tokensToText(inputs, { precedes } = {}) {
+    const text = inputs.map((t) => t.trivia + t.value).join("");
+    const nextToken = source[position];
+    if (nextToken.type === "eof") {
+      return text;
+    }
+    if (precedes) {
+      return text + nextToken.trivia;
+    }
+    return text.slice(nextToken.trivia.length);
+  }
+
+  const maxTokens = 5; // arbitrary but works well enough
+  const line =
+    source[position].type !== "eof"
+      ? source[position].line
+      : source.length > 1
+      ? source[position - 1].line
+      : 1;
+
+  const precedingLastLine = lastLine(
+    tokensToText(sliceTokens(-maxTokens), { precedes: true })
+  );
+
+  const subsequentTokens = sliceTokens(maxTokens);
+  const subsequentText = tokensToText(subsequentTokens);
+  const subsequentFirstLine = subsequentText.split("\n")[0];
+
+  const spaced = " ".repeat(precedingLastLine.length) + "^";
+  const sourceContext = precedingLastLine + subsequentFirstLine + "\n" + spaced;
+
+  const contextType = kind === "Syntax" ? "since" : "inside";
+  const inSourceName = source.name ? ` in ${source.name}` : "";
+  const grammaticalContext =
+    current && current.name
+      ? `, ${contextType} \`${current.partial ? "partial " : ""}${contextAsText(
+          current
+        )}\``
+      : "";
+  const context = `${kind} error at line ${line}${inSourceName}${grammaticalContext}:\n${sourceContext}`;
+  return {
+    message: `${context} ${message}`,
+    bareMessage: message,
+    context,
+    line,
+    sourceName: source.name,
+    level,
+    ruleName,
+    autofix,
+    input: subsequentText,
+    tokens: subsequentTokens,
+  };
+}
+
+/**
+ * @param {string} message error message
+ */
+function syntaxError(source, position, current, message) {
+  return error(source, position, current, message, "Syntax");
+}
+
+/**
+ * @param {string} message error message
+ * @param {WebIDL2ErrorOptions} [options]
+ */
+function validationError(
+  token,
+  current,
+  ruleName,
+  message,
+  options = {}
+) {
+  options.ruleName = ruleName;
+  return error(
+    current.source,
+    token.index,
+    current,
+    message,
+    "Validation",
+    options
+  );
+}
+
+
+/***/ }),
+/* 4 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "argument_list": () => (/* binding */ argument_list),
+/* harmony export */   "autoParenter": () => (/* binding */ autoParenter),
+/* harmony export */   "autofixAddExposedWindow": () => (/* binding */ autofixAddExposedWindow),
+/* harmony export */   "const_data": () => (/* binding */ const_data),
+/* harmony export */   "const_value": () => (/* binding */ const_value),
+/* harmony export */   "findLastIndex": () => (/* binding */ findLastIndex),
+/* harmony export */   "getFirstToken": () => (/* binding */ getFirstToken),
+/* harmony export */   "getLastIndentation": () => (/* binding */ getLastIndentation),
+/* harmony export */   "getMemberIndentation": () => (/* binding */ getMemberIndentation),
+/* harmony export */   "list": () => (/* binding */ list),
+/* harmony export */   "primitive_type": () => (/* binding */ primitive_type),
+/* harmony export */   "return_type": () => (/* binding */ return_type),
+/* harmony export */   "stringifier": () => (/* binding */ stringifier),
+/* harmony export */   "type_with_extended_attributes": () => (/* binding */ type_with_extended_attributes),
+/* harmony export */   "unescape": () => (/* binding */ unescape)
+/* harmony export */ });
+/* harmony import */ var _type_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(5);
+/* harmony import */ var _argument_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(11);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(13);
+/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(14);
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(2);
+
+
+
+
+
+
+
+/**
+ * @param {string} identifier
+ */
+function unescape(identifier) {
+  return identifier.startsWith("_") ? identifier.slice(1) : identifier;
+}
+
+/**
+ * Parses comma-separated list
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {object} args
+ * @param {Function} args.parser parser function for each item
+ * @param {boolean} [args.allowDangler] whether to allow dangling comma
+ * @param {string} [args.listName] the name to be shown on error messages
+ */
+function list(tokeniser, { parser, allowDangler, listName = "list" }) {
+  const first = parser(tokeniser);
+  if (!first) {
+    return [];
+  }
+  first.tokens.separator = tokeniser.consume(",");
+  const items = [first];
+  while (first.tokens.separator) {
+    const item = parser(tokeniser);
+    if (!item) {
+      if (!allowDangler) {
+        tokeniser.error(`Trailing comma in ${listName}`);
+      }
+      break;
+    }
+    item.tokens.separator = tokeniser.consume(",");
+    items.push(item);
+    if (!item.tokens.separator) break;
+  }
+  return items;
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function const_value(tokeniser) {
+  return (
+    tokeniser.consumeKind("decimal", "integer") ||
+    tokeniser.consume("true", "false", "Infinity", "-Infinity", "NaN")
+  );
+}
+
+/**
+ * @param {object} token
+ * @param {string} token.type
+ * @param {string} token.value
+ */
+function const_data({ type, value }) {
+  switch (type) {
+    case "decimal":
+    case "integer":
+      return { type: "number", value };
+    case "string":
+      return { type: "string", value: value.slice(1, -1) };
+  }
+
+  switch (value) {
+    case "true":
+    case "false":
+      return { type: "boolean", value: value === "true" };
+    case "Infinity":
+    case "-Infinity":
+      return { type: "Infinity", negative: value.startsWith("-") };
+    case "[":
+      return { type: "sequence", value: [] };
+    case "{":
+      return { type: "dictionary" };
+    default:
+      return { type: value };
+  }
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function primitive_type(tokeniser) {
+  function integer_type() {
+    const prefix = tokeniser.consume("unsigned");
+    const base = tokeniser.consume("short", "long");
+    if (base) {
+      const postfix = tokeniser.consume("long");
+      return new _type_js__WEBPACK_IMPORTED_MODULE_0__.Type({ source, tokens: { prefix, base, postfix } });
+    }
+    if (prefix) tokeniser.error("Failed to parse integer type");
+  }
+
+  function decimal_type() {
+    const prefix = tokeniser.consume("unrestricted");
+    const base = tokeniser.consume("float", "double");
+    if (base) {
+      return new _type_js__WEBPACK_IMPORTED_MODULE_0__.Type({ source, tokens: { prefix, base } });
+    }
+    if (prefix) tokeniser.error("Failed to parse float type");
+  }
+
+  const { source } = tokeniser;
+  const num_type = integer_type() || decimal_type();
+  if (num_type) return num_type;
+  const base = tokeniser.consume(
+    "bigint",
+    "boolean",
+    "byte",
+    "octet",
+    "undefined"
+  );
+  if (base) {
+    return new _type_js__WEBPACK_IMPORTED_MODULE_0__.Type({ source, tokens: { base } });
+  }
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function argument_list(tokeniser) {
+  return list(tokeniser, {
+    parser: _argument_js__WEBPACK_IMPORTED_MODULE_1__.Argument.parse,
+    listName: "arguments list",
+  });
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string=} typeName (TODO: See Type.type for more details)
+ */
+function type_with_extended_attributes(tokeniser, typeName) {
+  const extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(tokeniser);
+  const ret = _type_js__WEBPACK_IMPORTED_MODULE_0__.Type.parse(tokeniser, typeName);
+  if (ret) autoParenter(ret).extAttrs = extAttrs;
+  return ret;
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string=} typeName (TODO: See Type.type for more details)
+ */
+function return_type(tokeniser, typeName) {
+  const typ = _type_js__WEBPACK_IMPORTED_MODULE_0__.Type.parse(tokeniser, typeName || "return-type");
+  if (typ) {
+    return typ;
+  }
+  const voidToken = tokeniser.consume("void");
+  if (voidToken) {
+    const ret = new _type_js__WEBPACK_IMPORTED_MODULE_0__.Type({
+      source: tokeniser.source,
+      tokens: { base: voidToken },
+    });
+    ret.type = "return-type";
+    return ret;
+  }
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function stringifier(tokeniser) {
+  const special = tokeniser.consume("stringifier");
+  if (!special) return;
+  const member =
+    _attribute_js__WEBPACK_IMPORTED_MODULE_4__.Attribute.parse(tokeniser, { special }) ||
+    _operation_js__WEBPACK_IMPORTED_MODULE_3__.Operation.parse(tokeniser, { special }) ||
+    tokeniser.error("Unterminated stringifier");
+  return member;
+}
+
+/**
+ * @param {string} str
+ */
+function getLastIndentation(str) {
+  const lines = str.split("\n");
+  // the first line visually binds to the preceding token
+  if (lines.length) {
+    const match = lines[lines.length - 1].match(/^\s+/);
+    if (match) {
+      return match[0];
+    }
+  }
+  return "";
+}
+
+/**
+ * @param {string} parentTrivia
+ */
+function getMemberIndentation(parentTrivia) {
+  const indentation = getLastIndentation(parentTrivia);
+  const indentCh = indentation.includes("\t") ? "\t" : "  ";
+  return indentation + indentCh;
+}
+
+/**
+ * @param {import("./interface.js").Interface} def
+ */
+function autofixAddExposedWindow(def) {
+  return () => {
+    if (def.extAttrs.length) {
+      const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__.Tokeniser("Exposed=Window,");
+      const exposed = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.SimpleExtendedAttribute.parse(tokeniser);
+      exposed.tokens.separator = tokeniser.consume(",");
+      const existing = def.extAttrs[0];
+      if (!/^\s/.test(existing.tokens.name.trivia)) {
+        existing.tokens.name.trivia = ` ${existing.tokens.name.trivia}`;
+      }
+      def.extAttrs.unshift(exposed);
+    } else {
+      autoParenter(def).extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(
+        new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__.Tokeniser("[Exposed=Window]")
+      );
+      const trivia = def.tokens.base.trivia;
+      def.extAttrs.tokens.open.trivia = trivia;
+      def.tokens.base.trivia = `\n${getLastIndentation(trivia)}`;
+    }
+  };
+}
+
+/**
+ * Get the first syntax token for the given IDL object.
+ * @param {*} data
+ */
+function getFirstToken(data) {
+  if (data.extAttrs.length) {
+    return data.extAttrs.tokens.open;
+  }
+  if (data.type === "operation" && !data.special) {
+    return getFirstToken(data.idlType);
+  }
+  const tokens = Object.values(data.tokens).sort((x, y) => x.index - y.index);
+  return tokens[0];
+}
+
+/**
+ * @template T
+ * @param {T[]} array
+ * @param {(item: T) => boolean} predicate
+ */
+function findLastIndex(array, predicate) {
+  const index = array.slice().reverse().findIndex(predicate);
+  if (index === -1) {
+    return index;
+  }
+  return array.length - index - 1;
+}
+
+/**
+ * Returns a proxy that auto-assign `parent` field.
+ * @template {Record<string | symbol, any>} T
+ * @param {T} data
+ * @param {*} [parent] The object that will be assigned to `parent`.
+ *                     If absent, it will be `data` by default.
+ * @return {T}
+ */
+function autoParenter(data, parent) {
+  if (!parent) {
+    // Defaults to `data` unless specified otherwise.
+    parent = data;
+  }
+  if (!data) {
+    // This allows `autoParenter(undefined)` which again allows
+    // `autoParenter(parse())` where the function may return nothing.
+    return data;
+  }
+  const proxy = new Proxy(data, {
+    get(target, p) {
+      const value = target[p];
+      if (Array.isArray(value) && p !== "source") {
+        // Wraps the array so that any added items will also automatically
+        // get their `parent` values.
+        return autoParenter(value, target);
+      }
+      return value;
+    },
+    set(target, p, value) {
+      // @ts-ignore https://github.com/microsoft/TypeScript/issues/47357
+      target[p] = value;
+      if (!value) {
+        return true;
+      } else if (Array.isArray(value)) {
+        // Assigning an array will add `parent` to its items.
+        for (const item of value) {
+          if (typeof item.parent !== "undefined") {
+            item.parent = parent;
+          }
+        }
+      } else if (typeof value.parent !== "undefined") {
+        value.parent = parent;
+      }
+      return true;
+    },
+  });
+  return proxy;
+}
+
+
+/***/ }),
+/* 5 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Type": () => (/* binding */ Type)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(2);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(3);
+/* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(7);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(8);
+
+
+
+
+
+
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string} typeName
+ */
+function generic_type(tokeniser, typeName) {
+  const base = tokeniser.consume(
+    "FrozenArray",
+    "ObservableArray",
+    "Promise",
+    "sequence",
+    "record"
+  );
+  if (!base) {
+    return;
+  }
+  const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
+    new Type({ source: tokeniser.source, tokens: { base } })
+  );
+  ret.tokens.open =
+    tokeniser.consume("<") ||
+    tokeniser.error(`No opening bracket after ${base.value}`);
+  switch (base.value) {
+    case "Promise": {
+      if (tokeniser.probe("["))
+        tokeniser.error("Promise type cannot have extended attribute");
+      const subtype =
+        (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.return_type)(tokeniser, typeName) ||
+        tokeniser.error("Missing Promise subtype");
+      ret.subtype.push(subtype);
+      break;
+    }
+    case "sequence":
+    case "FrozenArray":
+    case "ObservableArray": {
+      const subtype =
+        (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser, typeName) ||
+        tokeniser.error(`Missing ${base.value} subtype`);
+      ret.subtype.push(subtype);
+      break;
+    }
+    case "record": {
+      if (tokeniser.probe("["))
+        tokeniser.error("Record key cannot have extended attribute");
+      const keyType =
+        tokeniser.consume(..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__.stringTypes) ||
+        tokeniser.error(`Record key must be one of: ${_tokeniser_js__WEBPACK_IMPORTED_MODULE_2__.stringTypes.join(", ")}`);
+      const keyIdlType = new Type({
+        source: tokeniser.source,
+        tokens: { base: keyType },
+      });
+      keyIdlType.tokens.separator =
+        tokeniser.consume(",") ||
+        tokeniser.error("Missing comma after record key type");
+      keyIdlType.type = typeName;
+      const valueType =
+        (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser, typeName) ||
+        tokeniser.error("Error parsing generic type record");
+      ret.subtype.push(keyIdlType, valueType);
+      break;
+    }
+  }
+  if (!ret.idlType) tokeniser.error(`Error parsing generic type ${base.value}`);
+  ret.tokens.close =
+    tokeniser.consume(">") ||
+    tokeniser.error(`Missing closing bracket after ${base.value}`);
+  return ret.this;
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function type_suffix(tokeniser, obj) {
+  const nullable = tokeniser.consume("?");
+  if (nullable) {
+    obj.tokens.nullable = nullable;
+  }
+  if (tokeniser.probe("?")) tokeniser.error("Can't nullable more than once");
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string} typeName
+ */
+function single_type(tokeniser, typeName) {
+  let ret = generic_type(tokeniser, typeName) || (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.primitive_type)(tokeniser);
+  if (!ret) {
+    const base =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.consume(..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__.stringTypes, ..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__.typeNameKeywords);
+    if (!base) {
+      return;
+    }
+    ret = new Type({ source: tokeniser.source, tokens: { base } });
+    if (tokeniser.probe("<"))
+      tokeniser.error(`Unsupported generic type ${base.value}`);
+  }
+  if (ret.generic === "Promise" && tokeniser.probe("?")) {
+    tokeniser.error("Promise type cannot be nullable");
+  }
+  ret.type = typeName || null;
+  type_suffix(tokeniser, ret);
+  if (ret.nullable && ret.idlType === "any")
+    tokeniser.error("Type `any` cannot be made nullable");
+  return ret;
+}
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string} type
+ */
+function union_type(tokeniser, type) {
+  const tokens = {};
+  tokens.open = tokeniser.consume("(");
+  if (!tokens.open) return;
+  const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(new Type({ source: tokeniser.source, tokens }));
+  ret.type = type || null;
+  while (true) {
+    const typ =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser) ||
+      tokeniser.error("No type after open parenthesis or 'or' in union type");
+    if (typ.idlType === "any")
+      tokeniser.error("Type `any` cannot be included in a union type");
+    if (typ.generic === "Promise")
+      tokeniser.error("Type `Promise` cannot be included in a union type");
+    ret.subtype.push(typ);
+    const or = tokeniser.consume("or");
+    if (or) {
+      typ.tokens.separator = or;
+    } else break;
+  }
+  if (ret.idlType.length < 2) {
+    tokeniser.error(
+      "At least two types are expected in a union type but found less"
+    );
+  }
+  tokens.close =
+    tokeniser.consume(")") || tokeniser.error("Unterminated union type");
+  type_suffix(tokeniser, ret);
+  return ret.this;
+}
+
+class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {string} typeName
+   */
+  static parse(tokeniser, typeName) {
+    return single_type(tokeniser, typeName) || union_type(tokeniser, typeName);
+  }
+
+  constructor({ source, tokens }) {
+    super({ source, tokens });
+    Object.defineProperty(this, "subtype", { value: [], writable: true });
+    this.extAttrs = new _extended_attributes_js__WEBPACK_IMPORTED_MODULE_5__.ExtendedAttributes({ source, tokens: {} });
+  }
+
+  get generic() {
+    if (this.subtype.length && this.tokens.base) {
+      return this.tokens.base.value;
+    }
+    return "";
+  }
+  get nullable() {
+    return Boolean(this.tokens.nullable);
+  }
+  get union() {
+    return Boolean(this.subtype.length) && !this.tokens.base;
+  }
+  get idlType() {
+    if (this.subtype.length) {
+      return this.subtype;
+    }
+    // Adding prefixes/postfixes for "unrestricted float", etc.
+    const name = [this.tokens.prefix, this.tokens.base, this.tokens.postfix]
+      .filter((t) => t)
+      .map((t) => t.value)
+      .join(" ");
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(name);
+  }
+
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+
+    if (this.idlType === "void") {
+      const message = `\`void\` is now replaced by \`undefined\`. Refer to the \
+[relevant GitHub issue](https://github.com/whatwg/webidl/issues/60) \
+for more information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_3__.validationError)(this.tokens.base, this, "replace-void", message, {
+        autofix: replaceVoid(this),
+      });
+    }
+
+    /*
+     * If a union is nullable, its subunions cannot include a dictionary
+     * If not, subunions may include dictionaries if each union is not nullable
+     */
+    const typedef = !this.union && defs.unique.get(this.idlType);
+    const target = this.union
+      ? this
+      : typedef && typedef.type === "typedef"
+      ? typedef.idlType
+      : undefined;
+    if (target && this.nullable) {
+      // do not allow any dictionary
+      const { reference } = (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__.idlTypeIncludesDictionary)(target, defs) || {};
+      if (reference) {
+        const targetToken = (this.union ? reference : this).tokens.base;
+        const message = "Nullable union cannot include a dictionary type.";
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_3__.validationError)(
+          targetToken,
+          this,
+          "no-nullable-union-dict",
+          message
+        );
+      }
+    } else {
+      // allow some dictionary
+      for (const subtype of this.subtype) {
+        yield* subtype.validate(defs);
+      }
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const type_body = () => {
+      if (this.union || this.generic) {
+        return w.ts.wrap([
+          w.token(this.tokens.base, w.ts.generic),
+          w.token(this.tokens.open),
+          ...this.subtype.map((t) => t.write(w)),
+          w.token(this.tokens.close),
+        ]);
+      }
+      const firstToken = this.tokens.prefix || this.tokens.base;
+      const prefix = this.tokens.prefix
+        ? [this.tokens.prefix.value, w.ts.trivia(this.tokens.base.trivia)]
+        : [];
+      const ref = w.reference(
+        w.ts.wrap([
+          ...prefix,
+          this.tokens.base.value,
+          w.token(this.tokens.postfix),
+        ]),
+        {
+          unescaped: /** @type {string} (because it's not union) */ (
+            this.idlType
+          ),
+          context: this,
+        }
+      );
+      return w.ts.wrap([w.ts.trivia(firstToken.trivia), ref]);
+    };
+    return w.ts.wrap([
+      this.extAttrs.write(w),
+      type_body(),
+      w.token(this.tokens.nullable),
+      w.token(this.tokens.separator),
+    ]);
+  }
+}
+
+/**
+ * @param {Type} type
+ */
+function replaceVoid(type) {
+  return () => {
+    type.tokens.base.value = "undefined";
+  };
+}
+
+
+/***/ }),
+/* 6 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Base": () => (/* binding */ Base)
+/* harmony export */ });
+class Base {
+  /**
+   * @param {object} initializer
+   * @param {Base["source"]} initializer.source
+   * @param {Base["tokens"]} initializer.tokens
+   */
+  constructor({ source, tokens }) {
+    Object.defineProperties(this, {
+      source: { value: source },
+      tokens: { value: tokens, writable: true },
+      parent: { value: null, writable: true },
+      this: { value: this }, // useful when escaping from proxy
+    });
+  }
+
+  toJSON() {
+    const json = { type: undefined, name: undefined, inheritance: undefined };
+    let proto = this;
+    while (proto !== Object.prototype) {
+      const descMap = Object.getOwnPropertyDescriptors(proto);
+      for (const [key, value] of Object.entries(descMap)) {
+        if (value.enumerable || value.get) {
+          // @ts-ignore - allow indexing here
+          json[key] = this[key];
+        }
+      }
+      proto = Object.getPrototypeOf(proto);
+    }
+    return json;
+  }
+}
+
+
+/***/ }),
+/* 7 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "dictionaryIncludesRequiredField": () => (/* binding */ dictionaryIncludesRequiredField),
+/* harmony export */   "idlTypeIncludesDictionary": () => (/* binding */ idlTypeIncludesDictionary)
+/* harmony export */ });
+/**
+ * @typedef {import("../productions/dictionary.js").Dictionary} Dictionary
+ *
+ * @param {*} idlType
+ * @param {import("../validator.js").Definitions} defs
+ * @param {object} [options]
+ * @param {boolean} [options.useNullableInner] use when the input idlType is nullable and you want to use its inner type
+ * @return {{ reference: *, dictionary: Dictionary }} the type reference that ultimately includes dictionary.
+ */
+function idlTypeIncludesDictionary(
+  idlType,
+  defs,
+  { useNullableInner } = {}
+) {
+  if (!idlType.union) {
+    const def = defs.unique.get(idlType.idlType);
+    if (!def) {
+      return;
+    }
+    if (def.type === "typedef") {
+      const { typedefIncludesDictionary } = defs.cache;
+      if (typedefIncludesDictionary.has(def)) {
+        // Note that this also halts when it met indeterminate state
+        // to prevent infinite recursion
+        return typedefIncludesDictionary.get(def);
+      }
+      defs.cache.typedefIncludesDictionary.set(def, undefined); // indeterminate state
+      const result = idlTypeIncludesDictionary(def.idlType, defs);
+      defs.cache.typedefIncludesDictionary.set(def, result);
+      if (result) {
+        return {
+          reference: idlType,
+          dictionary: result.dictionary,
+        };
+      }
+    }
+    if (def.type === "dictionary" && (useNullableInner || !idlType.nullable)) {
+      return {
+        reference: idlType,
+        dictionary: def,
+      };
+    }
+  }
+  for (const subtype of idlType.subtype) {
+    const result = idlTypeIncludesDictionary(subtype, defs);
+    if (result) {
+      if (subtype.union) {
+        return result;
+      }
+      return {
+        reference: subtype,
+        dictionary: result.dictionary,
+      };
+    }
+  }
+}
+
+/**
+ * @param {*} dict dictionary type
+ * @param {import("../validator.js").Definitions} defs
+ * @return {boolean}
+ */
+function dictionaryIncludesRequiredField(dict, defs) {
+  if (defs.cache.dictionaryIncludesRequiredField.has(dict)) {
+    return defs.cache.dictionaryIncludesRequiredField.get(dict);
+  }
+  // Set cached result to indeterminate to short-circuit circular definitions.
+  // The final result will be updated to true or false.
+  defs.cache.dictionaryIncludesRequiredField.set(dict, undefined);
+  let result = dict.members.some((field) => field.required);
+  if (!result && dict.inheritance) {
+    const superdict = defs.unique.get(dict.inheritance);
+    if (!superdict) {
+      // Assume required members in the supertype if it is unknown.
+      result = true;
+    } else if (dictionaryIncludesRequiredField(superdict, defs)) {
+      result = true;
+    }
+  }
+  defs.cache.dictionaryIncludesRequiredField.set(dict, result);
+  return result;
+}
+
+
+/***/ }),
+/* 8 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "ExtendedAttributeParameters": () => (/* binding */ ExtendedAttributeParameters),
+/* harmony export */   "ExtendedAttributes": () => (/* binding */ ExtendedAttributes),
+/* harmony export */   "SimpleExtendedAttribute": () => (/* binding */ SimpleExtendedAttribute)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _array_base_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(9);
+/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(10);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(3);
+
+
+
+
+
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {string} tokenName
+ */
+function tokens(tokeniser, tokenName) {
+  return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.list)(tokeniser, {
+    parser: _token_js__WEBPACK_IMPORTED_MODULE_2__.WrappedToken.parser(tokeniser, tokenName),
+    listName: tokenName + " list",
+  });
+}
+
+const extAttrValueSyntax = ["identifier", "decimal", "integer", "string"];
+
+const shouldBeLegacyPrefixed = [
+  "NoInterfaceObject",
+  "LenientSetter",
+  "LenientThis",
+  "TreatNonObjectAsNull",
+  "Unforgeable",
+];
+
+const renamedLegacies = new Map([
+  .../** @type {[string, string][]} */ (
+    shouldBeLegacyPrefixed.map((name) => [name, `Legacy${name}`])
+  ),
+  ["NamedConstructor", "LegacyFactoryFunction"],
+  ["OverrideBuiltins", "LegacyOverrideBuiltIns"],
+  ["TreatNullAs", "LegacyNullToEmptyString"],
+]);
+
+/**
+ * This will allow a set of extended attribute values to be parsed.
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function extAttrListItems(tokeniser) {
+  for (const syntax of extAttrValueSyntax) {
+    const toks = tokens(tokeniser, syntax);
+    if (toks.length) {
+      return toks;
+    }
+  }
+  tokeniser.error(
+    `Expected identifiers, strings, decimals, or integers but none found`
+  );
+}
+
+class ExtendedAttributeParameters extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const tokens = { assign: tokeniser.consume("=") };
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
+      new ExtendedAttributeParameters({ source: tokeniser.source, tokens })
+    );
+    ret.list = [];
+    if (tokens.assign) {
+      tokens.asterisk = tokeniser.consume("*");
+      if (tokens.asterisk) {
+        return ret.this;
+      }
+      tokens.secondaryName = tokeniser.consumeKind(...extAttrValueSyntax);
+    }
+    tokens.open = tokeniser.consume("(");
+    if (tokens.open) {
+      ret.list = ret.rhsIsList
+        ? // [Exposed=(Window,Worker)]
+          extAttrListItems(tokeniser)
+        : // [LegacyFactoryFunction=Audio(DOMString src)] or [Constructor(DOMString str)]
+          (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.argument_list)(tokeniser);
+      tokens.close =
+        tokeniser.consume(")") ||
+        tokeniser.error("Unexpected token in extended attribute argument list");
+    } else if (tokens.assign && !tokens.secondaryName) {
+      tokeniser.error("No right hand side to extended attribute assignment");
+    }
+    return ret.this;
+  }
+
+  get rhsIsList() {
+    return (
+      this.tokens.assign && !this.tokens.asterisk && !this.tokens.secondaryName
+    );
+  }
+
+  get rhsType() {
+    if (this.rhsIsList) {
+      return this.list[0].tokens.value.type + "-list";
+    }
+    if (this.tokens.asterisk) {
+      return "*";
+    }
+    if (this.tokens.secondaryName) {
+      return this.tokens.secondaryName.type;
+    }
+    return null;
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { rhsType } = this;
+    return w.ts.wrap([
+      w.token(this.tokens.assign),
+      w.token(this.tokens.asterisk),
+      w.reference_token(this.tokens.secondaryName, this.parent),
+      w.token(this.tokens.open),
+      ...this.list.map((p) => {
+        return rhsType === "identifier-list"
+          ? w.identifier(p, this.parent)
+          : p.write(w);
+      }),
+      w.token(this.tokens.close),
+    ]);
+  }
+}
+
+class SimpleExtendedAttribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const name = tokeniser.consumeKind("identifier");
+    if (name) {
+      return new SimpleExtendedAttribute({
+        source: tokeniser.source,
+        tokens: { name },
+        params: ExtendedAttributeParameters.parse(tokeniser),
+      });
+    }
+  }
+
+  constructor({ source, tokens, params }) {
+    super({ source, tokens });
+    params.parent = this;
+    Object.defineProperty(this, "params", { value: params });
+  }
+
+  get type() {
+    return "extended-attribute";
+  }
+  get name() {
+    return this.tokens.name.value;
+  }
+  get rhs() {
+    const { rhsType: type, tokens, list } = this.params;
+    if (!type) {
+      return null;
+    }
+    const value = this.params.rhsIsList
+      ? list
+      : this.params.tokens.secondaryName
+      ? (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.unescape)(tokens.secondaryName.value)
+      : null;
+    return { type, value };
+  }
+  get arguments() {
+    const { rhsIsList, list } = this.params;
+    if (!list || rhsIsList) {
+      return [];
+    }
+    return list;
+  }
+
+  *validate(defs) {
+    const { name } = this;
+    if (name === "LegacyNoInterfaceObject") {
+      const message = `\`[LegacyNoInterfaceObject]\` extended attribute is an \
+undesirable feature that may be removed from Web IDL in the future. Refer to the \
+[relevant upstream PR](https://github.com/whatwg/webidl/pull/609) for more \
+information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_4__.validationError)(
+        this.tokens.name,
+        this,
+        "no-nointerfaceobject",
+        message,
+        { level: "warning" }
+      );
+    } else if (renamedLegacies.has(name)) {
+      const message = `\`[${name}]\` extended attribute is a legacy feature \
+that is now renamed to \`[${renamedLegacies.get(name)}]\`. Refer to the \
+[relevant upstream PR](https://github.com/whatwg/webidl/pull/870) for more \
+information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_4__.validationError)(this.tokens.name, this, "renamed-legacy", message, {
+        level: "warning",
+        autofix: renameLegacyExtendedAttribute(this),
+      });
+    }
+    for (const arg of this.arguments) {
+      yield* arg.validate(defs);
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.wrap([
+      w.ts.trivia(this.tokens.name.trivia),
+      w.ts.extendedAttribute(
+        w.ts.wrap([
+          w.ts.extendedAttributeReference(this.name),
+          this.params.write(w),
+        ])
+      ),
+      w.token(this.tokens.separator),
+    ]);
+  }
+}
+
+/**
+ * @param {SimpleExtendedAttribute} extAttr
+ */
+function renameLegacyExtendedAttribute(extAttr) {
+  return () => {
+    const { name } = extAttr;
+    extAttr.tokens.name.value = renamedLegacies.get(name);
+    if (name === "TreatNullAs") {
+      extAttr.params.tokens = {};
+    }
+  };
+}
+
+// Note: we parse something simpler than the official syntax. It's all that ever
+// seems to be used
+class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__.ArrayBase {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const tokens = {};
+    tokens.open = tokeniser.consume("[");
+    const ret = new ExtendedAttributes({ source: tokeniser.source, tokens });
+    if (!tokens.open) return ret;
+    ret.push(
+      ...(0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.list)(tokeniser, {
+        parser: SimpleExtendedAttribute.parse,
+        listName: "extended attribute",
+      })
+    );
+    tokens.close =
+      tokeniser.consume("]") ||
+      tokeniser.error(
+        "Expected a closing token for the extended attribute list"
+      );
+    if (!ret.length) {
+      tokeniser.unconsume(tokens.close.index);
+      tokeniser.error("An extended attribute list must not be empty");
+    }
+    if (tokeniser.probe("[")) {
+      tokeniser.error(
+        "Illegal double extended attribute lists, consider merging them"
+      );
+    }
+    return ret;
+  }
+
+  *validate(defs) {
+    for (const extAttr of this) {
+      yield* extAttr.validate(defs);
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    if (!this.length) return "";
+    return w.ts.wrap([
+      w.token(this.tokens.open),
+      ...this.map((ea) => ea.write(w)),
+      w.token(this.tokens.close),
+    ]);
+  }
+}
+
+
+/***/ }),
+/* 9 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "ArrayBase": () => (/* binding */ ArrayBase)
+/* harmony export */ });
+class ArrayBase extends Array {
+  constructor({ source, tokens }) {
+    super();
+    Object.defineProperties(this, {
+      source: { value: source },
+      tokens: { value: tokens },
+      parent: { value: null, writable: true },
+    });
+  }
+}
+
+
+/***/ }),
+/* 10 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Eof": () => (/* binding */ Eof),
+/* harmony export */   "WrappedToken": () => (/* binding */ WrappedToken)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class WrappedToken extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {string} type
+   */
+  static parser(tokeniser, type) {
+    return () => {
+      const value = tokeniser.consumeKind(type);
+      if (value) {
+        return new WrappedToken({
+          source: tokeniser.source,
+          tokens: { value },
+        });
+      }
+    };
+  }
+
+  get value() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.value.value);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.wrap([
+      w.token(this.tokens.value),
+      w.token(this.tokens.separator),
+    ]);
+  }
+}
+
+class Eof extends WrappedToken {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const value = tokeniser.consumeKind("eof");
+    if (value) {
+      return new Eof({ source: tokeniser.source, tokens: { value } });
+    }
+  }
+
+  get type() {
+    return "eof";
+  }
+}
+
+
+/***/ }),
+/* 11 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Argument": () => (/* binding */ Argument)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(12);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(4);
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(2);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(3);
+/* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(7);
+
+
+
+
+
+
+
+
+class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const start_position = tokeniser.position;
+    /** @type {Base["tokens"]} */
+    const tokens = {};
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
+      new Argument({ source: tokeniser.source, tokens })
+    );
+    ret.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(tokeniser);
+    tokens.optional = tokeniser.consume("optional");
+    ret.idlType = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.type_with_extended_attributes)(tokeniser, "argument-type");
+    if (!ret.idlType) {
+      return tokeniser.unconsume(start_position);
+    }
+    if (!tokens.optional) {
+      tokens.variadic = tokeniser.consume("...");
+    }
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.consume(..._tokeniser_js__WEBPACK_IMPORTED_MODULE_4__.argumentNameKeywords);
+    if (!tokens.name) {
+      return tokeniser.unconsume(start_position);
+    }
+    ret.default = tokens.optional ? _default_js__WEBPACK_IMPORTED_MODULE_1__.Default.parse(tokeniser) : null;
+    return ret.this;
+  }
+
+  get type() {
+    return "argument";
+  }
+  get optional() {
+    return !!this.tokens.optional;
+  }
+  get variadic() {
+    return !!this.tokens.variadic;
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.unescape)(this.tokens.name.value);
+  }
+
+  /**
+   * @param {import("../validator.js").Definitions} defs
+   */
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+    yield* this.idlType.validate(defs);
+    const result = (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__.idlTypeIncludesDictionary)(this.idlType, defs, {
+      useNullableInner: true,
+    });
+    if (result) {
+      if (this.idlType.nullable) {
+        const message = `Dictionary arguments cannot be nullable.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_5__.validationError)(
+          this.tokens.name,
+          this,
+          "no-nullable-dict-arg",
+          message
+        );
+      } else if (!this.optional) {
+        if (
+          this.parent &&
+          !(0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__.dictionaryIncludesRequiredField)(result.dictionary, defs) &&
+          isLastRequiredArgument(this)
+        ) {
+          const message = `Dictionary argument must be optional if it has no required fields`;
+          yield (0,_error_js__WEBPACK_IMPORTED_MODULE_5__.validationError)(
+            this.tokens.name,
+            this,
+            "dict-arg-optional",
+            message,
+            {
+              autofix: autofixDictionaryArgumentOptionality(this),
+            }
+          );
+        }
+      } else if (!this.default) {
+        const message = `Optional dictionary arguments must have a default value of \`{}\`.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_5__.validationError)(
+          this.tokens.name,
+          this,
+          "dict-arg-default",
+          message,
+          {
+            autofix: autofixOptionalDictionaryDefaultValue(this),
+          }
+        );
+      }
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.wrap([
+      this.extAttrs.write(w),
+      w.token(this.tokens.optional),
+      w.ts.type(this.idlType.write(w)),
+      w.token(this.tokens.variadic),
+      w.name_token(this.tokens.name, { data: this }),
+      this.default ? this.default.write(w) : "",
+      w.token(this.tokens.separator),
+    ]);
+  }
+}
+
+/**
+ * @param {Argument} arg
+ */
+function isLastRequiredArgument(arg) {
+  const list = arg.parent.arguments || arg.parent.list;
+  const index = list.indexOf(arg);
+  const requiredExists = list.slice(index + 1).some((a) => !a.optional);
+  return !requiredExists;
+}
+
+/**
+ * @param {Argument} arg
+ */
+function autofixDictionaryArgumentOptionality(arg) {
+  return () => {
+    const firstToken = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.getFirstToken)(arg.idlType);
+    arg.tokens.optional = {
+      ...firstToken,
+      type: "optional",
+      value: "optional",
+    };
+    firstToken.trivia = " ";
+    autofixOptionalDictionaryDefaultValue(arg)();
+  };
+}
+
+/**
+ * @param {Argument} arg
+ */
+function autofixOptionalDictionaryDefaultValue(arg) {
+  return () => {
+    arg.default = _default_js__WEBPACK_IMPORTED_MODULE_1__.Default.parse(new _tokeniser_js__WEBPACK_IMPORTED_MODULE_4__.Tokeniser(" = {}"));
+  };
+}
+
+
+/***/ }),
+/* 12 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Default": () => (/* binding */ Default)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class Default extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const assign = tokeniser.consume("=");
+    if (!assign) {
+      return null;
+    }
+    const def =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.const_value)(tokeniser) ||
+      tokeniser.consumeKind("string") ||
+      tokeniser.consume("null", "[", "{") ||
+      tokeniser.error("No value for default");
+    const expression = [def];
+    if (def.value === "[") {
+      const close =
+        tokeniser.consume("]") ||
+        tokeniser.error("Default sequence value must be empty");
+      expression.push(close);
+    } else if (def.value === "{") {
+      const close =
+        tokeniser.consume("}") ||
+        tokeniser.error("Default dictionary value must be empty");
+      expression.push(close);
+    }
+    return new Default({
+      source: tokeniser.source,
+      tokens: { assign },
+      expression,
+    });
+  }
+
+  constructor({ source, tokens, expression }) {
+    super({ source, tokens });
+    expression.parent = this;
+    Object.defineProperty(this, "expression", { value: expression });
+  }
+
+  get type() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.const_data)(this.expression[0]).type;
+  }
+  get value() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.const_data)(this.expression[0]).value;
+  }
+  get negative() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.const_data)(this.expression[0]).negative;
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.wrap([
+      w.token(this.tokens.assign),
+      ...this.expression.map((t) => w.token(t)),
+    ]);
+  }
+}
+
+
+/***/ }),
+/* 13 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Operation": () => (/* binding */ Operation)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(3);
+
+
+
+
+class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @typedef {import("../tokeniser.js").Token} Token
+   *
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {Token} [options.special]
+   * @param {Token} [options.regular]
+   */
+  static parse(tokeniser, { special, regular } = {}) {
+    const tokens = { special };
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
+      new Operation({ source: tokeniser.source, tokens })
+    );
+    if (special && special.value === "stringifier") {
+      tokens.termination = tokeniser.consume(";");
+      if (tokens.termination) {
+        ret.arguments = [];
+        return ret;
+      }
+    }
+    if (!special && !regular) {
+      tokens.special = tokeniser.consume("getter", "setter", "deleter");
+    }
+    ret.idlType =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.return_type)(tokeniser) || tokeniser.error("Missing return type");
+    tokens.name =
+      tokeniser.consumeKind("identifier") || tokeniser.consume("includes");
+    tokens.open =
+      tokeniser.consume("(") || tokeniser.error("Invalid operation");
+    ret.arguments = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.argument_list)(tokeniser);
+    tokens.close =
+      tokeniser.consume(")") || tokeniser.error("Unterminated operation");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated operation, expected `;`");
+    return ret.this;
+  }
+
+  get type() {
+    return "operation";
+  }
+  get name() {
+    const { name } = this.tokens;
+    if (!name) {
+      return "";
+    }
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(name.value);
+  }
+  get special() {
+    if (!this.tokens.special) {
+      return "";
+    }
+    return this.tokens.special.value;
+  }
+
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+    if (!this.name && ["", "static"].includes(this.special)) {
+      const message = `Regular or static operations must have both a return type and an identifier.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_2__.validationError)(this.tokens.open, this, "incomplete-op", message);
+    }
+    if (this.idlType) {
+      yield* this.idlType.validate(defs);
+    }
+    for (const argument of this.arguments) {
+      yield* argument.validate(defs);
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    const body = this.idlType
+      ? [
+          w.ts.type(this.idlType.write(w)),
+          w.name_token(this.tokens.name, { data: this, parent }),
+          w.token(this.tokens.open),
+          w.ts.wrap(this.arguments.map((arg) => arg.write(w))),
+          w.token(this.tokens.close),
+        ]
+      : [];
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        this.tokens.name
+          ? w.token(this.tokens.special)
+          : w.token(this.tokens.special, w.ts.nameless, { data: this, parent }),
+        ...body,
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 14 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Attribute": () => (/* binding */ Attribute)
+/* harmony export */ });
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+/* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(7);
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(4);
+
+
+
+
+
+class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {import("../tokeniser.js").Token} [options.special]
+   * @param {boolean} [options.noInherit]
+   * @param {boolean} [options.readonly]
+   */
+  static parse(
+    tokeniser,
+    { special, noInherit = false, readonly = false } = {}
+  ) {
+    const start_position = tokeniser.position;
+    const tokens = { special };
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
+      new Attribute({ source: tokeniser.source, tokens })
+    );
+    if (!special && !noInherit) {
+      tokens.special = tokeniser.consume("inherit");
+    }
+    if (ret.special === "inherit" && tokeniser.probe("readonly")) {
+      tokeniser.error("Inherited attributes cannot be read-only");
+    }
+    tokens.readonly = tokeniser.consume("readonly");
+    if (readonly && !tokens.readonly && tokeniser.probe("attribute")) {
+      tokeniser.error("Attributes must be readonly in this context");
+    }
+    tokens.base = tokeniser.consume("attribute");
+    if (!tokens.base) {
+      tokeniser.unconsume(start_position);
+      return;
+    }
+    ret.idlType =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.type_with_extended_attributes)(tokeniser, "attribute-type") ||
+      tokeniser.error("Attribute lacks a type");
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.consume("async", "required") ||
+      tokeniser.error("Attribute lacks a name");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated attribute, expected `;`");
+    return ret.this;
+  }
+
+  get type() {
+    return "attribute";
+  }
+  get special() {
+    if (!this.tokens.special) {
+      return "";
+    }
+    return this.tokens.special.value;
+  }
+  get readonly() {
+    return !!this.tokens.readonly;
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.unescape)(this.tokens.name.value);
+  }
+
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+    yield* this.idlType.validate(defs);
+
+    switch (this.idlType.generic) {
+      case "sequence":
+      case "record": {
+        const message = `Attributes cannot accept ${this.idlType.generic} types.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
+          this.tokens.name,
+          this,
+          "attr-invalid-type",
+          message
+        );
+        break;
+      }
+      default: {
+        const { reference } =
+          (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__.idlTypeIncludesDictionary)(this.idlType, defs) || {};
+        if (reference) {
+          const targetToken = (this.idlType.union ? reference : this.idlType)
+            .tokens.base;
+          const message = "Attributes cannot accept dictionary types.";
+          yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
+            targetToken,
+            this,
+            "attr-invalid-type",
+            message
+          );
+        }
+      }
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.special),
+        w.token(this.tokens.readonly),
+        w.token(this.tokens.base),
+        w.ts.type(this.idlType.write(w)),
+        w.name_token(this.tokens.name, { data: this, parent }),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 15 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Enum": () => (/* binding */ Enum),
+/* harmony export */   "EnumValue": () => (/* binding */ EnumValue)
+/* harmony export */ });
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(4);
+/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(10);
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(6);
+
+
+
+
+class EnumValue extends _token_js__WEBPACK_IMPORTED_MODULE_1__.WrappedToken {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const value = tokeniser.consumeKind("string");
+    if (value) {
+      return new EnumValue({ source: tokeniser.source, tokens: { value } });
+    }
+  }
+
+  get type() {
+    return "enum-value";
+  }
+  get value() {
+    return super.value.slice(1, -1);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    return w.ts.wrap([
+      w.ts.trivia(this.tokens.value.trivia),
+      w.ts.definition(
+        w.ts.wrap(['"', w.ts.name(this.value, { data: this, parent }), '"']),
+        { data: this, parent }
+      ),
+      w.token(this.tokens.separator),
+    ]);
+  }
+}
+
+class Enum extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
+    const tokens = {};
+    tokens.base = tokeniser.consume("enum");
+    if (!tokens.base) {
+      return;
+    }
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("No name for enum");
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_0__.autoParenter)(new Enum({ source: tokeniser.source, tokens }));
+    tokeniser.current = ret.this;
+    tokens.open = tokeniser.consume("{") || tokeniser.error("Bodyless enum");
+    ret.values = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_0__.list)(tokeniser, {
+      parser: EnumValue.parse,
+      allowDangler: true,
+      listName: "enumeration",
+    });
+    if (tokeniser.probeKind("string")) {
+      tokeniser.error("No comma between enum values");
+    }
+    tokens.close =
+      tokeniser.consume("}") || tokeniser.error("Unexpected value in enum");
+    if (!ret.values.length) {
+      tokeniser.error("No value in enum");
+    }
+    tokens.termination =
+      tokeniser.consume(";") || tokeniser.error("No semicolon after enum");
+    return ret.this;
+  }
+
+  get type() {
+    return "enum";
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_0__.unescape)(this.tokens.name.value);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.base),
+        w.name_token(this.tokens.name, { data: this }),
+        w.token(this.tokens.open),
+        w.ts.wrap(this.values.map((v) => v.write(w))),
+        w.token(this.tokens.close),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this }
+    );
+  }
+}
+
+
+/***/ }),
+/* 16 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Includes": () => (/* binding */ Includes)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class Includes extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const target = tokeniser.consumeKind("identifier");
+    if (!target) {
+      return;
+    }
+    const tokens = { target };
+    tokens.includes = tokeniser.consume("includes");
+    if (!tokens.includes) {
+      tokeniser.unconsume(target.index);
+      return;
+    }
+    tokens.mixin =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("Incomplete includes statement");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("No terminating ; for includes statement");
+    return new Includes({ source: tokeniser.source, tokens });
+  }
+
+  get type() {
+    return "includes";
+  }
+  get target() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.target.value);
+  }
+  get includes() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.mixin.value);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.reference_token(this.tokens.target, this),
+        w.token(this.tokens.includes),
+        w.reference_token(this.tokens.mixin, this),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this }
+    );
+  }
+}
+
+
+/***/ }),
+/* 17 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Typedef": () => (/* binding */ Typedef)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class Typedef extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
+    const tokens = {};
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(new Typedef({ source: tokeniser.source, tokens }));
+    tokens.base = tokeniser.consume("typedef");
+    if (!tokens.base) {
+      return;
+    }
+    ret.idlType =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser, "typedef-type") ||
+      tokeniser.error("Typedef lacks a type");
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("Typedef lacks a name");
+    tokeniser.current = ret.this;
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated typedef, expected `;`");
+    return ret.this;
+  }
+
+  get type() {
+    return "typedef";
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.name.value);
+  }
+
+  *validate(defs) {
+    yield* this.idlType.validate(defs);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.base),
+        w.ts.type(this.idlType.write(w)),
+        w.name_token(this.tokens.name, { data: this }),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this }
+    );
+  }
+}
+
+
+/***/ }),
+/* 18 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "CallbackFunction": () => (/* binding */ CallbackFunction)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser, base) {
+    const tokens = { base };
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
+      new CallbackFunction({ source: tokeniser.source, tokens })
+    );
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("Callback lacks a name");
+    tokeniser.current = ret.this;
+    tokens.assign =
+      tokeniser.consume("=") || tokeniser.error("Callback lacks an assignment");
+    ret.idlType =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.return_type)(tokeniser) || tokeniser.error("Callback lacks a return type");
+    tokens.open =
+      tokeniser.consume("(") ||
+      tokeniser.error("Callback lacks parentheses for arguments");
+    ret.arguments = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.argument_list)(tokeniser);
+    tokens.close =
+      tokeniser.consume(")") || tokeniser.error("Unterminated callback");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated callback, expected `;`");
+    return ret.this;
+  }
+
+  get type() {
+    return "callback";
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.name.value);
+  }
+
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+    yield* this.idlType.validate(defs);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.base),
+        w.name_token(this.tokens.name, { data: this }),
+        w.token(this.tokens.assign),
+        w.ts.type(this.idlType.write(w)),
+        w.token(this.tokens.open),
+        ...this.arguments.map((arg) => arg.write(w)),
+        w.token(this.tokens.close),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this }
+    );
+  }
+}
+
+
+/***/ }),
+/* 19 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Interface": () => (/* binding */ Interface)
+/* harmony export */ });
+/* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
+/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(14);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(13);
+/* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(21);
+/* harmony import */ var _iterable_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(22);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(3);
+/* harmony import */ var _validators_interface_js__WEBPACK_IMPORTED_MODULE_7__ = __webpack_require__(23);
+/* harmony import */ var _constructor_js__WEBPACK_IMPORTED_MODULE_8__ = __webpack_require__(24);
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__ = __webpack_require__(2);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_10__ = __webpack_require__(8);
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function static_member(tokeniser) {
+  const special = tokeniser.consume("static");
+  if (!special) return;
+  const member =
+    _attribute_js__WEBPACK_IMPORTED_MODULE_1__.Attribute.parse(tokeniser, { special }) ||
+    _operation_js__WEBPACK_IMPORTED_MODULE_2__.Operation.parse(tokeniser, { special }) ||
+    tokeniser.error("No body in static member");
+  return member;
+}
+
+class Interface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser, base, { partial = null } = {}) {
+    const tokens = { partial, base };
+    return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
+      tokeniser,
+      new Interface({ source: tokeniser.source, tokens }),
+      {
+        inheritable: !partial,
+        allowedMembers: [
+          [_constant_js__WEBPACK_IMPORTED_MODULE_3__.Constant.parse],
+          [_constructor_js__WEBPACK_IMPORTED_MODULE_8__.Constructor.parse],
+          [static_member],
+          [_helpers_js__WEBPACK_IMPORTED_MODULE_5__.stringifier],
+          [_iterable_js__WEBPACK_IMPORTED_MODULE_4__.IterableLike.parse],
+          [_attribute_js__WEBPACK_IMPORTED_MODULE_1__.Attribute.parse],
+          [_operation_js__WEBPACK_IMPORTED_MODULE_2__.Operation.parse],
+        ],
+      }
+    );
+  }
+
+  get type() {
+    return "interface";
+  }
+
+  *validate(defs) {
+    yield* this.extAttrs.validate(defs);
+    if (
+      !this.partial &&
+      this.extAttrs.every((extAttr) => extAttr.name !== "Exposed")
+    ) {
+      const message = `Interfaces must have \`[Exposed]\` extended attribute. \
+To fix, add, for example, \`[Exposed=Window]\`. Please also consider carefully \
+if your interface should also be exposed in a Worker scope. Refer to the \
+[WebIDL spec section on Exposed](https://heycam.github.io/webidl/#Exposed) \
+for more information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_6__.validationError)(
+        this.tokens.name,
+        this,
+        "require-exposed",
+        message,
+        {
+          autofix: (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.autofixAddExposedWindow)(this),
+        }
+      );
+    }
+    const oldConstructors = this.extAttrs.filter(
+      (extAttr) => extAttr.name === "Constructor"
+    );
+    for (const constructor of oldConstructors) {
+      const message = `Constructors should now be represented as a \`constructor()\` operation on the interface \
+instead of \`[Constructor]\` extended attribute. Refer to the \
+[WebIDL spec section on constructor operations](https://heycam.github.io/webidl/#idl-constructors) \
+for more information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_6__.validationError)(
+        constructor.tokens.name,
+        this,
+        "constructor-member",
+        message,
+        {
+          autofix: autofixConstructor(this, constructor),
+        }
+      );
+    }
+
+    const isGlobal = this.extAttrs.some((extAttr) => extAttr.name === "Global");
+    if (isGlobal) {
+      const factoryFunctions = this.extAttrs.filter(
+        (extAttr) => extAttr.name === "LegacyFactoryFunction"
+      );
+      for (const named of factoryFunctions) {
+        const message = `Interfaces marked as \`[Global]\` cannot have factory functions.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_6__.validationError)(
+          named.tokens.name,
+          this,
+          "no-constructible-global",
+          message
+        );
+      }
+
+      const constructors = this.members.filter(
+        (member) => member.type === "constructor"
+      );
+      for (const named of constructors) {
+        const message = `Interfaces marked as \`[Global]\` cannot have constructors.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_6__.validationError)(
+          named.tokens.base,
+          this,
+          "no-constructible-global",
+          message
+        );
+      }
+    }
+
+    yield* super.validate(defs);
+    if (!this.partial) {
+      yield* (0,_validators_interface_js__WEBPACK_IMPORTED_MODULE_7__.checkInterfaceMemberDuplication)(defs, this);
+    }
+  }
+}
+
+function autofixConstructor(interfaceDef, constructorExtAttr) {
+  interfaceDef = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.autoParenter)(interfaceDef);
+  return () => {
+    const indentation = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getLastIndentation)(
+      interfaceDef.extAttrs.tokens.open.trivia
+    );
+    const memberIndent = interfaceDef.members.length
+      ? (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getLastIndentation)((0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getFirstToken)(interfaceDef.members[0]).trivia)
+      : (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getMemberIndentation)(indentation);
+    const constructorOp = _constructor_js__WEBPACK_IMPORTED_MODULE_8__.Constructor.parse(
+      new _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__.Tokeniser(`\n${memberIndent}constructor();`)
+    );
+    constructorOp.extAttrs = new _extended_attributes_js__WEBPACK_IMPORTED_MODULE_10__.ExtendedAttributes({
+      source: interfaceDef.source,
+      tokens: {},
+    });
+    (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.autoParenter)(constructorOp).arguments = constructorExtAttr.arguments;
+
+    const existingIndex = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.findLastIndex)(
+      interfaceDef.members,
+      (m) => m.type === "constructor"
+    );
+    interfaceDef.members.splice(existingIndex + 1, 0, constructorOp);
+
+    const { close } = interfaceDef.tokens;
+    if (!close.trivia.includes("\n")) {
+      close.trivia += `\n${indentation}`;
+    }
+
+    const { extAttrs } = interfaceDef;
+    const index = extAttrs.indexOf(constructorExtAttr);
+    const removed = extAttrs.splice(index, 1);
+    if (!extAttrs.length) {
+      extAttrs.tokens.open = extAttrs.tokens.close = undefined;
+    } else if (extAttrs.length === index) {
+      extAttrs[index - 1].tokens.separator = undefined;
+    } else if (!extAttrs[index].tokens.name.trivia.trim()) {
+      extAttrs[index].tokens.name.trivia = removed[0].tokens.name.trivia;
+    }
+  };
+}
+
+
+/***/ }),
+/* 20 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Container": () => (/* binding */ Container)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(8);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(4);
+
+
+
+
+/**
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ */
+function inheritance(tokeniser) {
+  const colon = tokeniser.consume(":");
+  if (!colon) {
+    return {};
+  }
+  const inheritance =
+    tokeniser.consumeKind("identifier") ||
+    tokeniser.error("Inheritance lacks a type");
+  return { colon, inheritance };
+}
+
+class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {*} instance TODO: This should be {T extends Container}, but see https://github.com/microsoft/TypeScript/issues/4628
+   * @param {*} args
+   */
+  static parse(tokeniser, instance, { inheritable, allowedMembers }) {
+    const { tokens, type } = instance;
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error(`Missing name in ${type}`);
+    tokeniser.current = instance;
+    instance = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.autoParenter)(instance);
+    if (inheritable) {
+      Object.assign(tokens, inheritance(tokeniser));
+    }
+    tokens.open = tokeniser.consume("{") || tokeniser.error(`Bodyless ${type}`);
+    instance.members = [];
+    while (true) {
+      tokens.close = tokeniser.consume("}");
+      if (tokens.close) {
+        tokens.termination =
+          tokeniser.consume(";") ||
+          tokeniser.error(`Missing semicolon after ${type}`);
+        return instance.this;
+      }
+      const ea = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__.ExtendedAttributes.parse(tokeniser);
+      let mem;
+      for (const [parser, ...args] of allowedMembers) {
+        mem = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.autoParenter)(parser(tokeniser, ...args));
+        if (mem) {
+          break;
+        }
+      }
+      if (!mem) {
+        tokeniser.error("Unknown member");
+      }
+      mem.extAttrs = ea;
+      instance.members.push(mem.this);
+    }
+  }
+
+  get partial() {
+    return !!this.tokens.partial;
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.unescape)(this.tokens.name.value);
+  }
+  get inheritance() {
+    if (!this.tokens.inheritance) {
+      return null;
+    }
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.unescape)(this.tokens.inheritance.value);
+  }
+
+  *validate(defs) {
+    for (const member of this.members) {
+      if (member.validate) {
+        yield* member.validate(defs);
+      }
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const inheritance = () => {
+      if (!this.tokens.inheritance) {
+        return "";
+      }
+      return w.ts.wrap([
+        w.token(this.tokens.colon),
+        w.ts.trivia(this.tokens.inheritance.trivia),
+        w.ts.inheritance(
+          w.reference(this.tokens.inheritance.value, { context: this })
+        ),
+      ]);
+    };
+
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.callback),
+        w.token(this.tokens.partial),
+        w.token(this.tokens.base),
+        w.token(this.tokens.mixin),
+        w.name_token(this.tokens.name, { data: this }),
+        inheritance(),
+        w.token(this.tokens.open),
+        w.ts.wrap(this.members.map((m) => m.write(w))),
+        w.token(this.tokens.close),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this }
+    );
+  }
+}
+
+
+/***/ }),
+/* 21 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Constant": () => (/* binding */ Constant)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _type_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(5);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(4);
+
+
+
+
+class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
+    const tokens = {};
+    tokens.base = tokeniser.consume("const");
+    if (!tokens.base) {
+      return;
+    }
+    let idlType = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.primitive_type)(tokeniser);
+    if (!idlType) {
+      const base =
+        tokeniser.consumeKind("identifier") ||
+        tokeniser.error("Const lacks a type");
+      idlType = new _type_js__WEBPACK_IMPORTED_MODULE_1__.Type({ source: tokeniser.source, tokens: { base } });
+    }
+    if (tokeniser.probe("?")) {
+      tokeniser.error("Unexpected nullable constant type");
+    }
+    idlType.type = "const-type";
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("Const lacks a name");
+    tokens.assign =
+      tokeniser.consume("=") || tokeniser.error("Const lacks value assignment");
+    tokens.value =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.const_value)(tokeniser) || tokeniser.error("Const lacks a value");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated const, expected `;`");
+    const ret = new Constant({ source: tokeniser.source, tokens });
+    (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.autoParenter)(ret).idlType = idlType;
+    return ret;
+  }
+
+  get type() {
+    return "const";
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.unescape)(this.tokens.name.value);
+  }
+  get value() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.const_data)(this.tokens.value);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.base),
+        w.ts.type(this.idlType.write(w)),
+        w.name_token(this.tokens.name, { data: this, parent }),
+        w.token(this.tokens.assign),
+        w.token(this.tokens.value),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 22 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "IterableLike": () => (/* binding */ IterableLike)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const start_position = tokeniser.position;
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
+      new IterableLike({ source: tokeniser.source, tokens: {} })
+    );
+    const { tokens } = ret;
+    tokens.readonly = tokeniser.consume("readonly");
+    if (!tokens.readonly) {
+      tokens.async = tokeniser.consume("async");
+    }
+    tokens.base = tokens.readonly
+      ? tokeniser.consume("maplike", "setlike")
+      : tokens.async
+      ? tokeniser.consume("iterable")
+      : tokeniser.consume("iterable", "maplike", "setlike");
+    if (!tokens.base) {
+      tokeniser.unconsume(start_position);
+      return;
+    }
+
+    const { type } = ret;
+    const secondTypeRequired = type === "maplike";
+    const secondTypeAllowed = secondTypeRequired || type === "iterable";
+    const argumentAllowed = ret.async && type === "iterable";
+
+    tokens.open =
+      tokeniser.consume("<") ||
+      tokeniser.error(`Missing less-than sign \`<\` in ${type} declaration`);
+    const first =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser) ||
+      tokeniser.error(`Missing a type argument in ${type} declaration`);
+    ret.idlType = [first];
+    ret.arguments = [];
+
+    if (secondTypeAllowed) {
+      first.tokens.separator = tokeniser.consume(",");
+      if (first.tokens.separator) {
+        ret.idlType.push((0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser));
+      } else if (secondTypeRequired) {
+        tokeniser.error(`Missing second type argument in ${type} declaration`);
+      }
+    }
+
+    tokens.close =
+      tokeniser.consume(">") ||
+      tokeniser.error(`Missing greater-than sign \`>\` in ${type} declaration`);
+
+    if (tokeniser.probe("(")) {
+      if (argumentAllowed) {
+        tokens.argsOpen = tokeniser.consume("(");
+        ret.arguments.push(...(0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.argument_list)(tokeniser));
+        tokens.argsClose =
+          tokeniser.consume(")") ||
+          tokeniser.error("Unterminated async iterable argument list");
+      } else {
+        tokeniser.error(`Arguments are only allowed for \`async iterable\``);
+      }
+    }
+
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error(`Missing semicolon after ${type} declaration`);
+
+    return ret.this;
+  }
+
+  get type() {
+    return this.tokens.base.value;
+  }
+  get readonly() {
+    return !!this.tokens.readonly;
+  }
+  get async() {
+    return !!this.tokens.async;
+  }
+
+  *validate(defs) {
+    for (const type of this.idlType) {
+      yield* type.validate(defs);
+    }
+    for (const argument of this.arguments) {
+      yield* argument.validate(defs);
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.readonly),
+        w.token(this.tokens.async),
+        w.token(this.tokens.base, w.ts.generic),
+        w.token(this.tokens.open),
+        w.ts.wrap(this.idlType.map((t) => t.write(w))),
+        w.token(this.tokens.close),
+        w.token(this.tokens.argsOpen),
+        w.ts.wrap(this.arguments.map((arg) => arg.write(w))),
+        w.token(this.tokens.argsClose),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent: this.parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 23 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "checkInterfaceMemberDuplication": () => (/* binding */ checkInterfaceMemberDuplication)
+/* harmony export */ });
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+
+
+/**
+ * @param {import("../validator.js").Definitions} defs
+ * @param {import("../productions/container.js").Container} i
+ */
+function* checkInterfaceMemberDuplication(defs, i) {
+  const opNames = groupOperationNames(i);
+  const partials = defs.partials.get(i.name) || [];
+  const mixins = defs.mixinMap.get(i.name) || [];
+  for (const ext of [...partials, ...mixins]) {
+    const additions = getOperations(ext);
+    const statics = additions.filter((a) => a.special === "static");
+    const nonstatics = additions.filter((a) => a.special !== "static");
+    yield* checkAdditions(statics, opNames.statics, ext, i);
+    yield* checkAdditions(nonstatics, opNames.nonstatics, ext, i);
+    statics.forEach((op) => opNames.statics.add(op.name));
+    nonstatics.forEach((op) => opNames.nonstatics.add(op.name));
+  }
+
+  /**
+   * @param {import("../productions/operation.js").Operation[]} additions
+   * @param {Set<string>} existings
+   * @param {import("../productions/container.js").Container} ext
+   * @param {import("../productions/container.js").Container} base
+   */
+  function* checkAdditions(additions, existings, ext, base) {
+    for (const addition of additions) {
+      const { name } = addition;
+      if (name && existings.has(name)) {
+        const isStatic = addition.special === "static" ? "static " : "";
+        const message = `The ${isStatic}operation "${name}" has already been defined for the base interface "${base.name}" either in itself or in a mixin`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
+          addition.tokens.name,
+          ext,
+          "no-cross-overload",
+          message
+        );
+      }
+    }
+  }
+
+  /**
+   * @param {import("../productions/container.js").Container} i
+   * @returns {import("../productions/operation.js").Operation[]}
+   */
+  function getOperations(i) {
+    return i.members.filter(({ type }) => type === "operation");
+  }
+
+  /**
+   * @param {import("../productions/container.js").Container} i
+   */
+  function groupOperationNames(i) {
+    const ops = getOperations(i);
+    return {
+      statics: new Set(
+        ops.filter((op) => op.special === "static").map((op) => op.name)
+      ),
+      nonstatics: new Set(
+        ops.filter((op) => op.special !== "static").map((op) => op.name)
+      ),
+    };
+  }
+}
+
+
+/***/ }),
+/* 24 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Constructor": () => (/* binding */ Constructor)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+
+
+
+class Constructor extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const base = tokeniser.consume("constructor");
+    if (!base) {
+      return;
+    }
+    /** @type {Base["tokens"]} */
+    const tokens = { base };
+    tokens.open =
+      tokeniser.consume("(") ||
+      tokeniser.error("No argument list in constructor");
+    const args = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.argument_list)(tokeniser);
+    tokens.close =
+      tokeniser.consume(")") || tokeniser.error("Unterminated constructor");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("No semicolon after constructor");
+    const ret = new Constructor({ source: tokeniser.source, tokens });
+    (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(ret).arguments = args;
+    return ret;
+  }
+
+  get type() {
+    return "constructor";
+  }
+
+  *validate(defs) {
+    for (const argument of this.arguments) {
+      yield* argument.validate(defs);
+    }
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.base, w.ts.nameless, { data: this, parent }),
+        w.token(this.tokens.open),
+        w.ts.wrap(this.arguments.map((arg) => arg.write(w))),
+        w.token(this.tokens.close),
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 25 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Mixin": () => (/* binding */ Mixin)
+/* harmony export */ });
+/* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
+/* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(21);
+/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(14);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(13);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(4);
+
+
+
+
+
+
+class Mixin extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
+  /**
+   * @typedef {import("../tokeniser.js").Token} Token
+   *
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {Token} base
+   * @param {object} [options]
+   * @param {Token} [options.partial]
+   */
+  static parse(tokeniser, base, { partial } = {}) {
+    const tokens = { partial, base };
+    tokens.mixin = tokeniser.consume("mixin");
+    if (!tokens.mixin) {
+      return;
+    }
+    return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
+      tokeniser,
+      new Mixin({ source: tokeniser.source, tokens }),
+      {
+        allowedMembers: [
+          [_constant_js__WEBPACK_IMPORTED_MODULE_1__.Constant.parse],
+          [_helpers_js__WEBPACK_IMPORTED_MODULE_4__.stringifier],
+          [_attribute_js__WEBPACK_IMPORTED_MODULE_2__.Attribute.parse, { noInherit: true }],
+          [_operation_js__WEBPACK_IMPORTED_MODULE_3__.Operation.parse, { regular: true }],
+        ],
+      }
+    );
+  }
+
+  get type() {
+    return "interface mixin";
+  }
+}
+
+
+/***/ }),
+/* 26 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Dictionary": () => (/* binding */ Dictionary)
+/* harmony export */ });
+/* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
+/* harmony import */ var _field_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(27);
+
+
+
+class Dictionary extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {import("../tokeniser.js").Token} [options.partial]
+   */
+  static parse(tokeniser, { partial } = {}) {
+    const tokens = { partial };
+    tokens.base = tokeniser.consume("dictionary");
+    if (!tokens.base) {
+      return;
+    }
+    return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
+      tokeniser,
+      new Dictionary({ source: tokeniser.source, tokens }),
+      {
+        inheritable: !partial,
+        allowedMembers: [[_field_js__WEBPACK_IMPORTED_MODULE_1__.Field.parse]],
+      }
+    );
+  }
+
+  get type() {
+    return "dictionary";
+  }
+}
+
+
+/***/ }),
+/* 27 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Field": () => (/* binding */ Field)
+/* harmony export */ });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
+/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(12);
+
+
+
+
+
+class Field extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
+    const tokens = {};
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(new Field({ source: tokeniser.source, tokens }));
+    ret.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(tokeniser);
+    tokens.required = tokeniser.consume("required");
+    ret.idlType =
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser, "dictionary-type") ||
+      tokeniser.error("Dictionary member lacks a type");
+    tokens.name =
+      tokeniser.consumeKind("identifier") ||
+      tokeniser.error("Dictionary member lacks a name");
+    ret.default = _default_js__WEBPACK_IMPORTED_MODULE_3__.Default.parse(tokeniser);
+    if (tokens.required && ret.default)
+      tokeniser.error("Required member must not have a default");
+    tokens.termination =
+      tokeniser.consume(";") ||
+      tokeniser.error("Unterminated dictionary member, expected `;`");
+    return ret.this;
+  }
+
+  get type() {
+    return "field";
+  }
+  get name() {
+    return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.name.value);
+  }
+  get required() {
+    return !!this.tokens.required;
+  }
+
+  *validate(defs) {
+    yield* this.idlType.validate(defs);
+  }
+
+  /** @param {import("../writer.js").Writer} w */
+  write(w) {
+    const { parent } = this;
+    return w.ts.definition(
+      w.ts.wrap([
+        this.extAttrs.write(w),
+        w.token(this.tokens.required),
+        w.ts.type(this.idlType.write(w)),
+        w.name_token(this.tokens.name, { data: this, parent }),
+        this.default ? this.default.write(w) : "",
+        w.token(this.tokens.termination),
+      ]),
+      { data: this, parent }
+    );
+  }
+}
+
+
+/***/ }),
+/* 28 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Namespace": () => (/* binding */ Namespace)
+/* harmony export */ });
+/* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
+/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(14);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(13);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(3);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(4);
+/* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(21);
+
+
+
+
+
+
+
+class Namespace extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {import("../tokeniser.js").Token} [options.partial]
+   */
+  static parse(tokeniser, { partial } = {}) {
+    const tokens = { partial };
+    tokens.base = tokeniser.consume("namespace");
+    if (!tokens.base) {
+      return;
+    }
+    return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
+      tokeniser,
+      new Namespace({ source: tokeniser.source, tokens }),
+      {
+        allowedMembers: [
+          [_attribute_js__WEBPACK_IMPORTED_MODULE_1__.Attribute.parse, { noInherit: true, readonly: true }],
+          [_constant_js__WEBPACK_IMPORTED_MODULE_5__.Constant.parse],
+          [_operation_js__WEBPACK_IMPORTED_MODULE_2__.Operation.parse, { regular: true }],
+        ],
+      }
+    );
+  }
+
+  get type() {
+    return "namespace";
+  }
+
+  *validate(defs) {
+    if (
+      !this.partial &&
+      this.extAttrs.every((extAttr) => extAttr.name !== "Exposed")
+    ) {
+      const message = `Namespaces must have [Exposed] extended attribute. \
+To fix, add, for example, [Exposed=Window]. Please also consider carefully \
+if your namespace should also be exposed in a Worker scope. Refer to the \
+[WebIDL spec section on Exposed](https://heycam.github.io/webidl/#Exposed) \
+for more information.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_3__.validationError)(
+        this.tokens.name,
+        this,
+        "require-exposed",
+        message,
+        {
+          autofix: (0,_helpers_js__WEBPACK_IMPORTED_MODULE_4__.autofixAddExposedWindow)(this),
+        }
+      );
+    }
+    yield* super.validate(defs);
+  }
+}
+
+
+/***/ }),
+/* 29 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "CallbackInterface": () => (/* binding */ CallbackInterface)
+/* harmony export */ });
+/* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(13);
+/* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(21);
+
+
+
+
+class CallbackInterface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
+  /**
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   */
+  static parse(tokeniser, callback, { partial = null } = {}) {
+    const tokens = { callback };
+    tokens.base = tokeniser.consume("interface");
+    if (!tokens.base) {
+      return;
+    }
+    return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
+      tokeniser,
+      new CallbackInterface({ source: tokeniser.source, tokens }),
+      {
+        inheritable: !partial,
+        allowedMembers: [
+          [_constant_js__WEBPACK_IMPORTED_MODULE_2__.Constant.parse],
+          [_operation_js__WEBPACK_IMPORTED_MODULE_1__.Operation.parse, { regular: true }],
+        ],
+      }
+    );
+  }
+
+  get type() {
+    return "callback interface";
+  }
+}
+
+
+/***/ }),
+/* 30 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "Writer": () => (/* binding */ Writer),
+/* harmony export */   "write": () => (/* binding */ write)
+/* harmony export */ });
+function noop(arg) {
+  return arg;
+}
+
+const templates = {
+  wrap: (items) => items.join(""),
+  trivia: noop,
+  name: noop,
+  reference: noop,
+  type: noop,
+  generic: noop,
+  nameless: noop,
+  inheritance: noop,
+  definition: noop,
+  extendedAttribute: noop,
+  extendedAttributeReference: noop,
+};
+
+class Writer {
+  constructor(ts) {
+    this.ts = Object.assign({}, templates, ts);
+  }
+
+  /**
+   * @param {string} raw
+   * @param {object} options
+   * @param {string} [options.unescaped]
+   * @param {import("./productions/base.js").Base} [options.context]
+   * @returns
+   */
+  reference(raw, { unescaped, context }) {
+    if (!unescaped) {
+      unescaped = raw.startsWith("_") ? raw.slice(1) : raw;
+    }
+    return this.ts.reference(raw, unescaped, context);
+  }
+
+  /**
+   * @param {import("./tokeniser.js").Token} t
+   * @param {Function} wrapper
+   * @param {...any} args
+   * @returns
+   */
+  token(t, wrapper = noop, ...args) {
+    if (!t) {
+      return "";
+    }
+    const value = wrapper(t.value, ...args);
+    return this.ts.wrap([this.ts.trivia(t.trivia), value]);
+  }
+
+  reference_token(t, context) {
+    return this.token(t, this.reference.bind(this), { context });
+  }
+
+  name_token(t, arg) {
+    return this.token(t, this.ts.name, arg);
+  }
+
+  identifier(id, context) {
+    return this.ts.wrap([
+      this.reference_token(id.tokens.value, context),
+      this.token(id.tokens.separator),
+    ]);
+  }
+}
+
+function write(ast, { templates: ts = templates } = {}) {
+  ts = Object.assign({}, templates, ts);
+
+  const w = new Writer(ts);
+
+  return ts.wrap(ast.map((it) => it.write(w)));
+}
+
+
+/***/ }),
+/* 31 */
+/***/ ((__unused_webpack___webpack_module__, __webpack_exports__, __webpack_require__) => {
+
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "validate": () => (/* binding */ validate)
+/* harmony export */ });
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+
+
+function getMixinMap(all, unique) {
+  const map = new Map();
+  const includes = all.filter((def) => def.type === "includes");
+  for (const include of includes) {
+    const mixin = unique.get(include.includes);
+    if (!mixin) {
+      continue;
+    }
+    const array = map.get(include.target);
+    if (array) {
+      array.push(mixin);
+    } else {
+      map.set(include.target, [mixin]);
+    }
+  }
+  return map;
+}
+
+/**
+ * @typedef {ReturnType<typeof groupDefinitions>} Definitions
+ */
+function groupDefinitions(all) {
+  const unique = new Map();
+  const duplicates = new Set();
+  const partials = new Map();
+  for (const def of all) {
+    if (def.partial) {
+      const array = partials.get(def.name);
+      if (array) {
+        array.push(def);
+      } else {
+        partials.set(def.name, [def]);
+      }
+      continue;
+    }
+    if (!def.name) {
+      continue;
+    }
+    if (!unique.has(def.name)) {
+      unique.set(def.name, def);
+    } else {
+      duplicates.add(def);
+    }
+  }
+  return {
+    all,
+    unique,
+    partials,
+    duplicates,
+    mixinMap: getMixinMap(all, unique),
+    cache: {
+      typedefIncludesDictionary: new WeakMap(),
+      dictionaryIncludesRequiredField: new WeakMap(),
+    },
+  };
+}
+
+function* checkDuplicatedNames({ unique, duplicates }) {
+  for (const dup of duplicates) {
+    const { name } = dup;
+    const message = `The name "${name}" of type "${
+      unique.get(name).type
+    }" was already seen`;
+    yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(dup.tokens.name, dup, "no-duplicate", message);
+  }
+}
+
+function* validateIterable(ast) {
+  const defs = groupDefinitions(ast);
+  for (const def of defs.all) {
+    if (def.validate) {
+      yield* def.validate(defs);
+    }
+  }
+  yield* checkDuplicatedNames(defs);
+}
+
+// Remove this once all of our support targets expose `.flat()` by default
+function flatten(array) {
+  if (array.flat) {
+    return array.flat();
+  }
+  return [].concat(...array);
+}
+
+/**
+ * @param {import("./productions/base.js").Base[]} ast
+ * @return {import("./error.js").WebIDLErrorData[]} validation errors
+ */
+function validate(ast) {
+  return [...validateIterable(flatten(ast))];
+}
+
+
+/***/ })
+/******/ 	]);
+/************************************************************************/
+/******/ 	// The module cache
+/******/ 	var __webpack_module_cache__ = {};
+/******/ 	
+/******/ 	// The require function
+/******/ 	function __webpack_require__(moduleId) {
+/******/ 		// Check if module is in cache
+/******/ 		var cachedModule = __webpack_module_cache__[moduleId];
+/******/ 		if (cachedModule !== undefined) {
+/******/ 			return cachedModule.exports;
+/******/ 		}
+/******/ 		// Create a new module (and put it into the cache)
+/******/ 		var module = __webpack_module_cache__[moduleId] = {
+/******/ 			// no module.id needed
+/******/ 			// no module.loaded needed
+/******/ 			exports: {}
+/******/ 		};
+/******/ 	
+/******/ 		// Execute the module function
+/******/ 		__webpack_modules__[moduleId](module, module.exports, __webpack_require__);
+/******/ 	
+/******/ 		// Return the exports of the module
+/******/ 		return module.exports;
+/******/ 	}
+/******/ 	
+/************************************************************************/
+/******/ 	/* webpack/runtime/define property getters */
+/******/ 	(() => {
+/******/ 		// define getter functions for harmony exports
+/******/ 		__webpack_require__.d = (exports, definition) => {
+/******/ 			for(var key in definition) {
+/******/ 				if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
+/******/ 					Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
+/******/ 				}
+/******/ 			}
+/******/ 		};
+/******/ 	})();
+/******/ 	
+/******/ 	/* webpack/runtime/hasOwnProperty shorthand */
+/******/ 	(() => {
+/******/ 		__webpack_require__.o = (obj, prop) => (Object.prototype.hasOwnProperty.call(obj, prop))
+/******/ 	})();
+/******/ 	
+/******/ 	/* webpack/runtime/make namespace object */
+/******/ 	(() => {
+/******/ 		// define __esModule on exports
+/******/ 		__webpack_require__.r = (exports) => {
+/******/ 			if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
+/******/ 				Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
+/******/ 			}
+/******/ 			Object.defineProperty(exports, '__esModule', { value: true });
+/******/ 		};
+/******/ 	})();
+/******/ 	
+/************************************************************************/
+var __webpack_exports__ = {};
+// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
+(() => {
+__webpack_require__.r(__webpack_exports__);
+/* harmony export */ __webpack_require__.d(__webpack_exports__, {
+/* harmony export */   "WebIDLParseError": () => (/* reexport safe */ _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__.WebIDLParseError),
+/* harmony export */   "parse": () => (/* reexport safe */ _lib_webidl2_js__WEBPACK_IMPORTED_MODULE_0__.parse),
+/* harmony export */   "validate": () => (/* reexport safe */ _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__.validate),
+/* harmony export */   "write": () => (/* reexport safe */ _lib_writer_js__WEBPACK_IMPORTED_MODULE_1__.write)
+/* harmony export */ });
+/* harmony import */ var _lib_webidl2_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(1);
+/* harmony import */ var _lib_writer_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(30);
+/* harmony import */ var _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(31);
+/* harmony import */ var _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(2);
+
+
+
+
+
+})();
+
+/******/ 	return __webpack_exports__;
+/******/ })()
+;
+});
+//# sourceMappingURL=webidl2.js.map
\ No newline at end of file
diff --git a/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers b/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers
new file mode 100644
index 0000000..6805c32
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8