File: .eslintrc.js

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"use strict";

module.exports = {
    "extends": [
        "../mozilla/toolkit/.eslintrc.js"
    ],
    "rules": {
        // Enforce one true brace style (opening brace on the same line)
        // Allow single line (for now) because of the vast number of changes needed
        "brace-style": [2, "1tbs", { allowSingleLine: true }],

        // Enforce newline at the end of file, with no multiple empty lines.
        "eol-last": 2,

        // Disallow using variables outside the blocks they are defined
        "block-scoped-var": 2,

        // Allow trailing commas for easy list extension.  Having them does not
        // impair readability, but also not required either.
        "comma-dangle": 0,

        // Enforce spacing before and after comma
        "comma-spacing": [2, { before: false, after: true }],

        // Enforce one true comma style.
        "comma-style": [2, "last"],

        // Enforce curly brace conventions for all control statements.
        "curly": 2,

        // Enforce the spacing around the * in generator functions.
        "generator-star-spacing": [2, "after"],

        // Require space before/after arrow function's arrow
        "arrow-spacing": [2, { before: true, after: true }],

        // Enforces spacing between keys and values in object literal properties.
        "key-spacing": [2, { beforeColon: false, afterColon: true, mode: "minimum" }],

        // Disallow the omission of parentheses when invoking a constructor with no
        // arguments.
        "new-parens": 2,

        // Disallow use of the Array constructor.
        "no-array-constructor": 2,

        // disallow use of the Object constructor
        "no-new-object": 2,

        // Disallow Primitive Wrapper Instances
        "no-new-wrappers": 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,

        // Disallow use of debugger.
        "no-debugger": 2,

        // Disallow deletion of variables (deleting properties is fine).
        "no-delete-var": 2,

        // 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 the use of empty character classes in regular expressions.
        "no-empty-character-class": 2,

        // Disallow assigning to the exception in a catch block.
        "no-ex-assign": 2,

        // Disallow adding to native types
        "no-extend-native": 2,

        // Disallow double-negation boolean casts in a boolean context.
        "no-extra-boolean-cast": 2,

        // Disallow unnecessary semicolons.
        "no-extra-semi": 2,

        // Disallow mixed spaces and tabs for indentation.
        "no-mixed-spaces-and-tabs": 2,

        // Disallow reassignments of native objects.
        "no-native-reassign": 2,

        // Disallow nested ternary expressions, they make the code hard to read.
        "no-nested-ternary": 2,

        // Disallow use of octal literals.
        "no-octal": 2,

        // Disallow comparisons where both sides are exactly the same.
        "no-self-compare": 2,

        // Disallow sparse arrays, eg. let arr = [,,2].
        // Array destructuring is fine though:
        // for (let [, breakpointPromise] of aPromises)
        "no-sparse-arrays": 2,

        // Disallow trailing whitespace at the end of lines.
        "no-trailing-spaces": 2,

        // Disallow use of the with statement.
        "no-with": 2,

        // Disallow comparisons with the value NaN.
        "use-isnan": 2,

        // Ensure that the results of typeof are compared against a valid string.
        "valid-typeof": 2,

        // disallow the use of object properties of the global object (Math and
        // JSON) as functions
        "no-obj-calls": 2,

        // disallow use of octal escape sequences in string literals, such as
        // var foo = "Copyright \251";
        "no-octal-escape": 2,

        // disallow use of void operator
        "no-void": 2,

        // Disallow Yoda conditions (where literal value comes first).
        "yoda": 2,

        // Require a space immediately following the // in a line comment.
        "spaced-comment": [2, "always"],

        // Require use of the second argument for parseInt().
        "radix": 2,

        // Require spaces before/after unary operators (words on by default,
        // nonwords off by default).
        "space-unary-ops": [2, { words: true, nonwords: false }],

        // Enforce spacing after semicolons.
        "semi-spacing": [2, { before: false, after: true }],

        // Disallow the use of Boolean literals in conditional expressions.
        "no-unneeded-ternary": 2,

        // Disallow use of multiple spaces (sometimes used to align const values,
        // array or object items, etc.). It's hard to maintain and doesn't add that
        // much benefit.
        "no-multi-spaces": 2,

        // Require spaces around operators, except for a|0.
        // Disabled for now given eslint doesn't support default args yet
        // "space-infix-ops": [2, { "int32Hint": true }],

        // Require a space around all keywords.
        "keyword-spacing": 2,

        // Disallow space between function identifier and application.
        "no-spaced-func": 2,

        // Disallow shadowing of names such as arguments.
        "no-shadow-restricted-names": 2,

        // Disallow use of comma operator.
        "no-sequences": 2,

        // 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,

        // Require return statements to either always or never specify values
        "consistent-return": 2,

        // Disallow padding within blocks.
        "padded-blocks": [2, "never"],

        // Disallow spaces inside parentheses.
        "space-in-parens": [2, "never"],

        // Require space after keyword for anonymous functions, but disallow space
        // after name of named functions.
        "space-before-function-paren": [2, { anonymous: "never", named: "never" }],

        // Disallow unreachable statements after a return, throw, continue, or break
        // statement.
        "no-unreachable": 2,

        // Always require use of semicolons wherever they are valid.
        "semi": [2, "always"],

        // 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 declaring the same variable more than once (we use let anyway).
        "no-redeclare": 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,

        // We use var-only-at-top-level instead of no-var as we allow top level
        // vars.
        "no-var": 0,
        "mozilla/var-only-at-top-level": 1,

        // Disallow global and local variables that aren't used, but allow unused function arguments.
        "no-unused-vars": [2, { vars: "all", args: "none", varsIgnorePattern: "EXPORTED_SYMBOLS" }],

        "mozilla/mark-test-function-used": 1,

        // Require padding inside curly braces
        "object-curly-spacing": [2, "always"],

        // Disallow spaces inside of brackets
        "array-bracket-spacing": [2, "never"],

        // Disallow control characters in regular expressions
        "no-control-regex": 2,

        // Disallow invalid regular expression strings in RegExp constructors
        "no-invalid-regexp": 2,

        // Disallow multiple spaces in regular expression literals
        "no-regex-spaces": 2,

        // Disallow irregular whitespace
        "no-irregular-whitespace": 2,

        // Disallow negating the left operand in `in` expressions
        "no-negated-in-lhs": 2,

        // Allow constant expressions in conditions
        // With 2.11.0 we can enable this with checkLoops: false
        "no-constant-condition": [2, { checkLoops: false }],

        // Disallow Regexs That Look Like Division
        "no-div-regex": 2,

        // Disallow Iterator (using __iterator__)
        "no-iterator": 2,

        // Enforce consistent linebreak style
        "linebreak-style": [2, "unix"],

        // Enforces return statements in callbacks of array's methods
        "array-callback-return": 2,

        // Verify super() calls in constructors
        "constructor-super": 2,

        // Disallow modifying variables of class declarations
        "no-class-assign": 2,

        // Disallow modifying variables that are declared using const
        "no-const-assign": 2,

        // Disallow duplicate name in class members
        "no-dupe-class-members": 2,

        // Disallow use of this/super before calling super() in constructors
        "no-this-before-super": 2,

        // Disallow duplicate imports
        "no-duplicate-imports": 2,

        // Disallow empty destructuring patterns
        "no-empty-pattern": 2,

        // Disallow Labeled Statements
        "no-labels": 2,

        // Disallow Multiline Strings
        "no-multi-str": 2,

        // Disallow Symbol Constructor
        "no-new-symbol": 2,

        // Disallow Initializing to undefined
        "no-undef-init": 2,

        // Disallow control flow statements in finally blocks
        "no-unsafe-finally": 2,

        // Disallow Unused Labels
        "no-unused-labels": 2,

        // Disallow unnecessary computed property keys on objects
        "no-useless-computed-key": 2,

        // Disallow unnecessary constructor
        "no-useless-constructor": 2,

        // Disallow renaming import, export, and destructured assignments to the
        // same name
        "no-useless-rename": 2,

        // Enforce spacing between rest and spread operators and their expressions
        "rest-spread-spacing": [2, "never"],

        // Disallow usage of spacing in template string expressions
        "template-curly-spacing": [2, "never"],

        // Disallow the Unicode Byte Order Mark
        "unicode-bom": [2, "never"],

        // Enforce spacing around the * in yield* expressions
        "yield-star-spacing": [2, "after"],

        // Disallow Implied eval
        "no-implied-eval": 2,

        // Disallow unnecessary function binding
        "no-extra-bind": 2,

        // Disallow new For Side Effects
        "no-new": 2,

        // Disallow Self Assignment
        "no-self-assign": 2,

        // Disallow confusing multiline expressions
        "no-unexpected-multiline": 2,

        // Require IIFEs to be Wrapped
        "wrap-iife": [2, "inside"],

        // Disallow Unused Expressions
        "no-unused-expressions": 2,

        // Disallow function or var declarations in nested blocks
        "no-inner-declarations": 2,

        // Enforce newline before and after dot
        "dot-location": [2, "property"],

        // Disallow Use of caller/callee
        "no-caller": 2,

        // Disallow Case Statement Fallthrough
        "no-fallthrough": 2,

        // Disallow Floating Decimals
        "no-floating-decimal": 2,

        // Require Space Before Blocks
        "space-before-blocks": 2,

        // Operators always before the line break
        "operator-linebreak": [2, "after", { overrides: { ":": "before", "?": "ignore" } }],

        // Restricts the use of parentheses to only where they are necessary
        // Disabled for now since this also removes parens around assignments, e.g. let foo = bar == baz
        // "no-extra-parens": [2, "all", { "conditionalAssign": false, "returnAssign": false, "nestedBinaryExpressions": false }],

        // Double quotes should be used.
        "quotes": [2, "double", { avoidEscape: true }],

        // Disallow if as the only statement in an else block.
        "no-lonely-if": 2,

        // Not more than two empty lines with in the file, and no extra lines at
        // beginning or end of file.
        "no-multiple-empty-lines": [2, { max: 2, maxEOF: 0, maxBOF: 0 }],

        // Make sure all setters have a corresponding getter
        "accessor-pairs": 2,

        // Enforce spaces inside of single line blocks
        "block-spacing": [2, "always"],

        // Disallow spaces inside of computed properties
        "computed-property-spacing": [2, "never"],

        // Require consistent this (using |self|)
        "consistent-this": [2, "self"],

        // Disallow unnecessary .call() and .apply()
        "no-useless-call": 2,

        // Require dot notation when accessing properties
        "dot-notation": 2,

        // Disallow named function expressions
        "func-names": [2, "never"],

        // Enforce placing object properties on separate lines
        "object-property-newline": [2, { allowMultiplePropertiesPerLine: true }],

        // Enforce consistent line breaks inside braces
        "object-curly-newline": [2, { multiline: true }],

        // Disallow whitespace before properties
        "no-whitespace-before-property": 2,

        // Disallow unnecessary escape usage
        "no-useless-escape": 2,

        // Disallow mixes of different operators, but allow simple math operations.
        "no-mixed-operators": [2, {
            groups: [
                /* ["+", "-", "*", "/", "%", "**"], */
                ["&", "|", "^", "~", "<<", ">>", ">>>"],
                ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
                ["&&", "||"],
                ["in", "instanceof"]
            ]
        }],

        // Disallow unnecessary concatenation of strings
        "no-useless-concat": 2,

        // Disallow unmodified conditions of loops
        "no-unmodified-loop-condition": 2,

        // Suggest using arrow functions as callbacks
        "prefer-arrow-callback": [2, { allowNamedFunctions: true }],

        // Suggest using the spread operator instead of .apply()
        "prefer-spread": 2,

        // Quoting style for property names
        "quote-props": [2, "consistent-as-needed", { keywords: true }],

        // Disallow negated conditions
        "no-negated-condition": 2,

        // Enforce a maximum number of statements allowed per line
        "max-statements-per-line": [2, { max: 2 }],

        // Disallow arrow functions where they could be confused with comparisons
        "no-confusing-arrow": 2,

        // Disallow Unnecessary Nested Blocks
        "no-lone-blocks": 2,

        // Enforce minimum identifier length
        "id-length": [2, {
            min: 3,
            exceptions: [
                /* sorting */ "a", "b",
                /* exceptions */ "e", "ex",
                /* loop indices */ "i", "j", "k", "n",
                /* coordinates */ "x", "y",
                /* regexes */ "re",
                /* known words */ "rc", "rv", "id", "OS", "os", "db",
                /* mail/calendar words */ "to", "cc",
                /* Components */ "Ci", "Cc", "Cu", "Cr",
            ]
        }],

        // Disallow lexical declarations in case/default clauses
        "no-case-declarations": 2,

        // Enforce consistent indentation (4-space)
        "indent": [2, 4, { SwitchCase: 1 }],

        // The following rules will not be enabled currently, but are kept here for
        // easier updates in the future.
        "no-else-return": 0,
    }
};