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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/>. */
import globals from "globals";
import react from "eslint-plugin-react";
import mozilla from "eslint-plugin-mozilla";
import importPlugin from "eslint-plugin-import";
import jestPlugin from "eslint-plugin-jest";
export default [
{
files: ["**/tests/**"],
...jestPlugin.configs["flat/recommended"],
},
{
plugins: { jest: jestPlugin, react, mozilla, import: importPlugin },
languageOptions: {
parserOptions: {
ecmaVersion: "latest",
ecmaFeatures: { jsx: true },
},
sourceType: "module",
globals: {
...globals.es6,
...globals.browser,
...globals.commonjs,
...globals.jest,
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,
},
},
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": "error",
"mozilla/no-aArgs": "error",
// See bug
1224289.
"mozilla/reject-importGlobalProperties": "error",
"mozilla/var-only-at-top-level": "error",
// Rules from the React plugin
"react/jsx-uses-react": "error",
"react/jsx-uses-vars": "error",
"react/no-danger": "error",
"react/no-did-mount-set-state": "error",
"react/no-did-update-set-state": "error",
"react/no-direct-mutation-state": "error",
"react/no-unknown-property": "error",
"react/prop-types": "off",
"react/sort-comp": [
"error",
{
order: ["propTypes", "everything-else", "render"],
},
],
// Check for import errors.
"import/no-duplicates": "error",
"import/named": "error",
"import/export": "error",
// Adds compatibility with jest-in-case cases. See related GitHub issue
//
https://github.com/jest-community/eslint-plugin-jest/issues/534
"jest/no-standalone-expect": [
"error",
{ additionalTestBlockFunctions: ["cases"] },
],
// 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:
23 }],
// 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,
// 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 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 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 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 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,
// 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. Allow unused function arguments
// that are prefixed with `_`.
"no-unused-vars": [
2,
{ vars: "all", caughtErrors: "none", argsIgnorePattern: "^_" },
],
// 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,
// 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,
},
settings: {
jest: {
// Keep in sync with "jest" version from debugger's package.json
version:
29,
},
},
},
];