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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
"use strict";
module.exports = {
plugins: ["spidermonkey-js"],
overrides: [
{
files: ["*.js"],
excludedFiles: ".eslintrc.js",
processor: "spidermonkey-js/processor",
env: {
// Disable all built-in environments.
node: false,
browser: false,
builtin: false,
// We need to explicitly disable the default environments added from
// "tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js".
es2021: false,
"mozilla/privileged": false,
"mozilla/specific": false,
// Enable SpiderMonkey's self-hosted environment.
"spidermonkey-js/environment": true,
},
parserOptions: {
ecmaVersion: "latest",
sourceType: "script",
// Self-hosted code defaults to strict mode.
ecmaFeatures: {
impliedStrict: true,
},
// Strict mode has to be enabled separately for the Babel parser.
babelOptions: {
parserOpts: {
strictMode: true,
},
},
},
rules: {
// We should fix those at some point, but we use this to detect NaNs.
"no-self-compare": "off",
"no-lonely-if": "off",
// Disabled until we can use let/const to fix those erorrs, and undefined
// names cause an exception and abort during runtime initialization.
"no-redeclare": "off",
// Disallow use of |void 0|. Instead use |undefined|.
"no-void": ["error", { allowAsStatement: true }],
// Disallow loose equality because of objects with the [[IsHTMLDDA]]
// internal slot, aka |document.all|, aka "objects emulating undefined".
eqeqeq: "error",
// All self-hosted code is implicitly strict mode, so there's no need to
// add a strict-mode directive.
strict: ["error", "never"],
// Disallow syntax not supported in self-hosted code.
"no-restricted-syntax": [
"error",
{
selector: "ClassDeclaration",
message: "Class declarations are not allowed",
},
{
selector: "ClassExpression",
message: "Class expressions are not allowed",
},
{
selector: "Literal[regex]",
message: "Regular expression literals are not allowed",
},
{
selector: "CallExpression > MemberExpression.callee",
message:
"Direct method calls are not allowed, use callFunction() or callContentFunction()",
},
{
selector: "NewExpression > MemberExpression.callee",
message:
"Direct method calls are not allowed, use constructContentFunction()",
},
{
selector: "YieldExpression[delegate=true]",
message:
"yield* is not allowed because it can run user-modifiable iteration code",
},
{
selector: "ForOfStatement > :not(CallExpression).right",
message:
"for-of loops must use allowContentIter(), allowContentIterWith(), or allowContentIterWithNext()",
},
{
selector:
"ForOfStatement > CallExpression.right > :not(Identifier[name='allowContentIter'], Identifier[name='allowContentIterWith'], Identifier[name='allowContentIterWithNext']).callee",
message:
"for-of loops must use allowContentIter(), allowContentIterWith(), or allowContentIterWithNext",
},
{
selector:
"CallExpression[callee.name='TO_PROPERTY_KEY'] > :not(Identifier).arguments:first-child",
message:
"TO_PROPERTY_KEY macro must be called with a simple identifier",
},
{
selector: "Identifier[name='arguments']",
message:
"'arguments' is disallowed, use ArgumentsLength(), GetArgument(n), or rest-parameters",
},
{
selector: "VariableDeclaration[kind='let']",
message: "'let' declarations are disallowed to avoid TDZ checks, use 'var' instead",
},
{
selector: "VariableDeclaration[kind='const']",
message: "'const' declarations are disallowed to avoid TDZ checks, use 'var' instead",
},
],
// Method signatures are important in builtins so disable unused argument errors.
"no-unused-vars": [
"error",
{
args: "none",
vars: "local",
},
],
},
globals: {
// The bytecode compiler special-cases these identifiers.
ArgumentsLength: "readonly",
allowContentIter: "readonly",
allowContentIterWith: "readonly",
allowContentIterWithNext: "readonly",
callContentFunction: "readonly",
callFunction: "readonly",
constructContentFunction: "readonly",
DefineDataProperty: "readonly",
forceInterpreter: "readonly",
GetArgument: "readonly",
GetBuiltinConstructor: "readonly",
GetBuiltinPrototype: "readonly",
GetBuiltinSymbol: "readonly",
getPropertySuper: "readonly",
hasOwn: "readonly",
IsNullOrUndefined: "readonly",
IteratorClose: "readonly",
resumeGenerator: "readonly",
SetCanonicalName: "readonly",
SetIsInlinableLargeFunction: "readonly",
ToNumeric: "readonly",
ToString: "readonly",
// We've disabled all built-in environments, which also removed
// `undefined` from the list of globals. Put it back because it's
// actually allowed in self-hosted code.
undefined: "readonly",
// Disable globals from stage 2/3 proposals for which we have work in
// progress patches. Eventually these will be part of a future ES
// release, in which case we can remove these extra entries.
AsyncIterator: "off",
Iterator: "off",
Record: "off",
Temporal: "off",
Tuple: "off",
},
},
],
};