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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+module.exports = {
+ plugins: ["react", "mozilla", "@babel", "import", "file-header"],
+ globals: {
+ atob: true,
+ btoa: true,
+ Cc: true,
+ Ci: true,
+ Components: true,
+ console: true,
+ Cr: true,
+ Cu: true,
+ devtools: true,
+ dump: true,
+ EventEmitter: true,
+ isWorker: true,
+ loader: true,
+ Services: true,
+ Task: true,
+ XPCOMUtils: true,
+ _Iterator: true,
+ __dirname: true,
+ process: true,
+ global: true,
+ L10N: true,
+ },
+ extends: ["prettier", "plugin:jest/recommended"],
+ parserOptions: {
+ ecmaVersion: 2016,
+ sourceType: "module",
+ ecmaFeatures: { jsx: true },
+
+ // When the linter runs from the MC root, it won't pick up this project's
+ // babel.config.js, so we explicitly set Babel's root location so that
+ // it knows where to look.
+ babelOptions: {
+ root: __dirname,
+ },
+ },
+ env: {
+ es6: true,
+ browser: true,
+ commonjs: true,
+ jest: true,
+ },
+ rules: {
+ // These are the rules that have been configured so far to match the
+ // devtools coding style.
+
+ // Rules from the mozilla plugin
+ "mozilla/mark-test-function-used": 1,
+ "mozilla/no-aArgs": 1,
+ // See bug 1224289.
+ "mozilla/reject-importGlobalProperties": 1,
+ "mozilla/var-only-at-top-level": 1,
+
+ // Rules from the React plugin
+ "react/jsx-uses-react": [2],
+ "react/jsx-uses-vars": [2],
+ "react/no-danger": 1,
+ "react/no-did-mount-set-state": 1,
+ "react/no-did-update-set-state": 1,
+ "react/no-direct-mutation-state": 1,
+ "react/no-unknown-property": 1,
+ "react/prop-types": 1,
+ "react/sort-comp": [
+ 1,
+ {
+ order: ["propTypes", "everything-else", "render"],
+ },
+ ],
+
+ // Check for import errors.
+ "import/no-duplicates": "error",
+ "import/named": "error",
+ "import/export": "error",
+
+ // Incompatible with jest-in-case cases. See related GitHub issue
+ // https://github.com/jest-community/eslint-plugin-jest/issues/534
+ "jest/no-standalone-expect": "off",
+
+ // Disallow flow control that escapes from "finally".
+ "no-unsafe-finally": "error",
+
+ // Disallow using variables outside the blocks they are defined (especially
+ // since only let and const are used, see "no-var").
+ "block-scoped-var": 2,
+ // Require camel case names
+ camelcase: ["error", { properties: "never" }],
+ // Warn about cyclomatic complexity in functions.
+ complexity: ["error", { max: 22 }],
+ // Don't warn for inconsistent naming when capturing this (not so important
+ // with auto-binding fat arrow functions).
+ "consistent-this": 0,
+ // Don't require a default case in switch statements. Avoid being forced to
+ // add a bogus default when you know all possible cases are handled.
+ "default-case": 0,
+ // Encourage the use of dot notation whenever possible.
+ "dot-notation": 2,
+ // Allow using == instead of ===, in the interest of landing something since
+ // the devtools codebase is split on convention here.
+ eqeqeq: 0,
+ // Don't require function expressions to have a name.
+ // This makes the code more verbose and hard to read. Our engine already
+ // does a fantastic job assigning a name to the function, which includes
+ // the enclosing function name, and worst case you have a line number that
+ // you can just look up.
+ "func-names": 0,
+ // Allow use of function declarations and expressions.
+ "func-style": 0,
+ // Deprecated, will be removed in 1.0.
+ "global-strict": 0,
+ // Only useful in a node environment.
+ "handle-callback-err": 0,
+ // Don't enforce the maximum depth that blocks can be nested. The complexity
+ // rule is a better rule to check this.
+ "max-depth": 0,
+ // Maximum depth callbacks can be nested.
+ "max-nested-callbacks": [2, 4],
+ // Don't limit the number of parameters that can be used in a function.
+ "max-params": 0,
+ // Don't limit the maximum number of statement allowed in a function. We
+ // already have the complexity rule that's a better measurement.
+ "max-statements": 0,
+ // Require a capital letter for constructors, only check if all new
+ // operators are followed by a capital letter. Don't warn when capitalized
+ // functions are used without the new operator.
+ "new-cap": [2, { capIsNew: false }],
+ // Disallow use of the Array constructor.
+ "no-array-constructor": 2,
+ // Allow use of bitwise operators.
+ "no-bitwise": 0,
+ // Disallow use of arguments.caller or arguments.callee.
+ "no-caller": 2,
+ // Disallow the catch clause parameter name being the same as a variable in
+ // the outer scope, to avoid confusion.
+ "no-catch-shadow": 2,
+ // Disallow assignment in conditional expressions.
+ "no-cond-assign": 2,
+ // Allow using the console API.
+ "no-console": 0,
+ // Allow using constant expressions in conditions like while (true)
+ "no-constant-condition": 0,
+ // Allow use of the continue statement.
+ "no-continue": 0,
+ // Disallow control characters in regular expressions.
+ "no-control-regex": 2,
+ // Disallow use of debugger.
+ "no-debugger": 2,
+ // Disallow deletion of variables (deleting properties is fine).
+ "no-delete-var": 2,
+ // Allow division operators explicitly at beginning of regular expression.
+ "no-div-regex": 0,
+ // Disallow duplicate arguments in functions.
+ "no-dupe-args": 2,
+ // Disallow duplicate keys when creating object literals.
+ "no-dupe-keys": 2,
+ // Disallow a duplicate case label.
+ "no-duplicate-case": 2,
+ // Disallow else after a return in an if. The else around the second return
+ // here is useless:
+ // if (something) { return false; } else { return true; }
+ "no-else-return": 2,
+ // Disallow empty statements. This will report an error for:
+ // try { something(); } catch (e) {}
+ // but will not report it for:
+ // try { something(); } catch (e) { /* Silencing the error because ...*/ }
+ // which is a valid use case.
+ "no-empty": 2,
+ // Disallow the use of empty character classes in regular expressions.
+ "no-empty-character-class": 2,
+ // Disallow use of labels for anything other then loops and switches.
+ "no-labels": 2,
+ // Disallow use of eval(). We have other APIs to evaluate code in content.
+ "no-eval": 2,
+ // Disallow assigning to the exception in a catch block.
+ "no-ex-assign": 2,
+ // Disallow adding to native types
+ "no-extend-native": 2,
+ // Disallow unnecessary function binding.
+ "no-extra-bind": 2,
+ // Disallow double-negation boolean casts in a boolean context.
+ "no-extra-boolean-cast": 2,
+ // Deprecated, will be removed in 1.0.
+ "no-extra-strict": 0,
+ // Disallow fallthrough of case statements, except if there is a comment.
+ "no-fallthrough": 2,
+ // Disallow comments inline after code.
+ "no-inline-comments": 2,
+ // Disallow if as the only statement in an else block.
+ "no-lonely-if": 2,
+ // Allow mixing regular variable and require declarations (not a node env).
+ "no-mixed-requires": 0,
+ // Disallow use of multiline strings (use template strings instead).
+ "no-multi-str": 2,
+ "prefer-template": "error",
+ "prefer-const": [
+ "error",
+ {
+ destructuring: "all",
+ ignoreReadBeforeAssign: false,
+ },
+ ],
+ // Disallow reassignments of native objects.
+ "no-native-reassign": 2,
+ // Disallow nested ternary expressions, they make the code hard to read.
+ "no-nested-ternary": 2,
+ // Allow use of new operator with the require function.
+ "no-new-require": 0,
+ // Disallow use of octal literals.
+ "no-octal": 2,
+ // Allow reassignment of function parameters.
+ "no-param-reassign": 0,
+ // Allow string concatenation with __dirname and __filename (not a node env).
+ "no-path-concat": 0,
+ // Allow use of unary operators, ++ and --.
+ "no-plusplus": 0,
+ // Allow using process.env (not a node environment).
+ "no-process-env": 0,
+ // Allow using process.exit (not a node environment).
+ "no-process-exit": 0,
+ // Disallow usage of __proto__ property.
+ "no-proto": 2,
+ // Disallow declaring the same variable more than once (we use let anyway).
+ "no-redeclare": 2,
+ // Disallow multiple spaces in a regular expression literal.
+ "no-regex-spaces": 2,
+ // Don't restrict usage of specified node modules (not a node environment).
+ "no-restricted-modules": 0,
+ // Disallow use of assignment in return statement. It is preferable for a
+ // single line of code to have only one easily predictable effect.
+ "no-return-assign": 2,
+ // Allow use of javascript: urls.
+ "no-script-url": 0,
+ // Disallow comparisons where both sides are exactly the same.
+ "no-self-compare": 2,
+ // Disallow use of comma operator.
+ "no-sequences": 2,
+ // Warn about declaration of variables already declared in the outer scope.
+ // This isn't an error because it sometimes is useful to use the same name
+ // in a small helper function rather than having to come up with another
+ // random name.
+ // Still, making this a warning can help people avoid being confused.
+ "no-shadow": 2,
+ // Disallow shadowing of names such as arguments.
+ "no-shadow-restricted-names": 2,
+ // Disallow sparse arrays, eg. let arr = [,,2].
+ // Array destructuring is fine though:
+ // for (let [, breakpointPromise] of aPromises)
+ "no-sparse-arrays": 2,
+ // Allow use of synchronous methods (not a node environment).
+ "no-sync": 0,
+ // Allow the use of ternary operators.
+ "no-ternary": 0,
+ // Disallow throwing literals (eg. throw "error" instead of
+ // throw new Error("error")).
+ "no-throw-literal": 2,
+ // Disallow use of undeclared variables unless mentioned in a /*global */
+ // block. Note that globals from head.js are automatically imported in tests
+ // by the import-headjs-globals rule form the mozilla eslint plugin.
+ "no-undef": 2,
+ // Allow dangling underscores in identifiers (for privates).
+ "no-underscore-dangle": 0,
+ // Allow use of undefined variable.
+ "no-undefined": 0,
+ // Disallow the use of Boolean literals in conditional expressions.
+ "no-unneeded-ternary": 2,
+ // Disallow unreachable statements after a return, throw, continue, or break
+ // statement.
+ "no-unreachable": 2,
+ // Disallow global and local variables that arent used, but allow unused function arguments.
+ "no-unused-vars": [2, { vars: "all", args: "none" }],
+ // Allow using variables before they are defined.
+ "no-use-before-define": 0,
+ // We use var-only-at-top-level instead of no-var as we allow top level
+ // vars.
+ "no-var": 0,
+ // Allow using TODO/FIXME comments.
+ "no-warning-comments": 0,
+ // Disallow use of the with statement.
+ "no-with": 2,
+ // Dont require method and property shorthand syntax for object literals.
+ // We use this in the code a lot, but not consistently, and this seems more
+ // like something to check at code review time.
+ "object-shorthand": 0,
+ // Allow more than one variable declaration per function.
+ "one-var": 0,
+ // Require use of the second argument for parseInt().
+ radix: 2,
+ // Dont require to sort variables within the same declaration block.
+ // Anyway, one-var is disabled.
+ "sort-vars": 0,
+ // Require "use strict" to be defined globally in the script.
+ strict: [2, "global"],
+ // Disallow comparisons with the value NaN.
+ "use-isnan": 2,
+ // Ensure that the results of typeof are compared against a valid string.
+ "valid-typeof": 2,
+ // Allow vars to be declared anywhere in the scope.
+ "vars-on-top": 0,
+ // Disallow Yoda conditions (where literal value comes first).
+ yoda: 2,
+
+ // And these are the rules that haven't been discussed so far, and that are
+ // disabled for now until we introduce them, one at a time.
+
+ // Require for-in loops to have an if statement.
+ "guard-for-in": 0,
+ // allow/disallow an empty newline after var statement
+ "newline-after-var": 0,
+ // disallow the use of alert, confirm, and prompt
+ "no-alert": 0,
+ // disallow comparisons to null without a type-checking operator
+ "no-eq-null": 0,
+ // disallow overwriting functions written as function declarations
+ "no-func-assign": 0,
+ // disallow use of eval()-like methods
+ "no-implied-eval": 0,
+ // disallow function or variable declarations in nested blocks
+ "no-inner-declarations": 0,
+ // disallow invalid regular expression strings in the RegExp constructor
+ "no-invalid-regexp": 0,
+ // disallow irregular whitespace outside of strings and comments
+ "no-irregular-whitespace": 0,
+ // disallow labels that share a name with a variable
+ "no-label-var": 0,
+ // disallow unnecessary nested blocks
+ "no-lone-blocks": 0,
+ // disallow creation of functions within loops
+ "no-loop-func": 0,
+ // disallow negation of the left operand of an in expression
+ "no-negated-in-lhs": 0,
+ // disallow use of new operator when not part of the assignment or
+ // comparison
+ "no-new": 0,
+ // disallow use of new operator for Function object
+ "no-new-func": 0,
+ // disallow use of the Object constructor
+ "no-new-object": 0,
+ // disallows creating new instances of String,Number, and Boolean
+ "no-new-wrappers": 0,
+ // disallow the use of object properties of the global object (Math and
+ // JSON) as functions
+ "no-obj-calls": 0,
+ // disallow use of octal escape sequences in string literals, such as
+ // var foo = "Copyright \251";
+ "no-octal-escape": 0,
+ // disallow use of undefined when initializing variables
+ "no-undef-init": 0,
+ // disallow usage of expressions in statement position
+ "no-unused-expressions": 0,
+ // disallow use of void operator
+ "no-void": 0,
+ // require assignment operator shorthand where possible or prohibit it
+ // entirely
+ "operator-assignment": 0,
+
+ "file-header/file-header": [
+ "error",
+ [
+ "This Source Code Form is subject to the terms of the Mozilla Public",
+ "License, v. 2.0. If a copy of the MPL was not distributed with this",
+ "file, You can obtain one at <http://mozilla.org/MPL/2.0/>.",
+ ],
+ "block",
+ ["-\\*-(.*)-\\*-", "eslint(.*)", "vim(.*)"],
+ ],
+ },
+};