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.eslintrc.js
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.eslintrc.js
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'use strict';
/* eslint-env node */
const Module = require('module');
const path = require('path');
const NodePlugin = require('./tools/node_modules/eslint-plugin-node-core');
NodePlugin.RULES_DIR = path.resolve(__dirname, 'tools', 'eslint-rules');
// The Module._findPath() monkeypatching is to make it so that ESLint will work
// if invoked by a globally-installed ESLint or ESLint installed elsewhere
// rather than the one we ship. This makes it possible for IDEs to lint files
// with our rules while people edit them.
const ModuleFindPath = Module._findPath;
const hacks = [
'eslint-plugin-node-core',
'eslint-plugin-markdown',
'babel-eslint',
];
Module._findPath = (request, paths, isMain) => {
const r = ModuleFindPath(request, paths, isMain);
if (!r && hacks.includes(request)) {
try {
return require.resolve(`./tools/node_modules/${request}`);
// Keep the variable in place to ensure that ESLint started by older Node.js
// versions work as expected.
// eslint-disable-next-line no-unused-vars
} catch (e) {
return require.resolve(
`./tools/node_modules/eslint/node_modules/${request}`);
}
}
return r;
};
module.exports = {
root: true,
plugins: ['markdown', 'node-core'],
parser: 'babel-eslint',
parserOptions: { sourceType: 'script' },
overrides: [
{
files: [
'doc/api/esm.md',
'doc/api/module.md',
'doc/api/modules.md',
'doc/api/packages.md',
'test/es-module/test-esm-type-flag.js',
'test/es-module/test-esm-type-flag-alias.js',
'*.mjs',
'test/es-module/test-esm-example-loader.js',
],
parserOptions: { sourceType: 'module' },
},
{
files: ['**/*.md'],
parserOptions: { ecmaFeatures: { impliedStrict: true } },
rules: { strict: 'off' },
},
],
rules: {
// ESLint built-in rules
// https://eslint.org/docs/rules/
'accessor-pairs': 'error',
'array-callback-return': 'error',
'arrow-parens': ['error', 'always'],
'arrow-spacing': ['error', { before: true, after: true }],
'block-scoped-var': 'error',
'block-spacing': 'error',
'brace-style': ['error', '1tbs', { allowSingleLine: true }],
'capitalized-comments': ['error', 'always', {
line: {
// Ignore all lines that have less characters than 20 and all lines that
// start with something that looks like a variable name or code.
// eslint-disable-next-line max-len
ignorePattern: '.{0,20}$|[a-z]+ ?[0-9A-Z_.(/=:[#-]|std|http|ssh|ftp|(let|var|const) [a-z_A-Z0-9]+ =|[b-z] |[a-z]*[0-9].* ',
ignoreInlineComments: true,
ignoreConsecutiveComments: true,
},
block: {
ignorePattern: '.*',
},
}],
'comma-dangle': ['error', 'only-multiline'],
'comma-spacing': 'error',
'comma-style': 'error',
'computed-property-spacing': 'error',
'constructor-super': 'error',
'default-case-last': 'error',
'dot-location': ['error', 'property'],
'dot-notation': 'error',
'eol-last': 'error',
'eqeqeq': ['error', 'smart'],
'for-direction': 'error',
'func-call-spacing': 'error',
'func-name-matching': 'error',
'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
'getter-return': 'error',
'indent': ['error', 2, {
ArrayExpression: 'first',
CallExpression: { arguments: 'first' },
FunctionDeclaration: { parameters: 'first' },
FunctionExpression: { parameters: 'first' },
MemberExpression: 'off',
ObjectExpression: 'first',
SwitchCase: 1,
}],
'key-spacing': ['error', { mode: 'strict' }],
'keyword-spacing': 'error',
'linebreak-style': ['error', 'unix'],
'max-len': ['error', {
code: 80,
ignorePattern: '^// Flags:',
ignoreRegExpLiterals: true,
ignoreUrls: true,
tabWidth: 2,
}],
'new-parens': 'error',
'no-async-promise-executor': 'error',
'no-class-assign': 'error',
'no-confusing-arrow': 'error',
'no-const-assign': 'error',
'no-constructor-return': 'error',
'no-control-regex': 'error',
'no-debugger': 'error',
'no-delete-var': 'error',
'no-dupe-args': 'error',
'no-dupe-class-members': 'error',
'no-dupe-keys': 'error',
'no-dupe-else-if': 'error',
'no-duplicate-case': 'error',
'no-duplicate-imports': 'error',
'no-else-return': ['error', { allowElseIf: true }],
'no-empty-character-class': 'error',
'no-ex-assign': 'error',
'no-extra-boolean-cast': 'error',
'no-extra-parens': ['error', 'functions'],
'no-extra-semi': 'error',
'no-fallthrough': 'error',
'no-func-assign': 'error',
'no-global-assign': 'error',
'no-invalid-regexp': 'error',
'no-irregular-whitespace': 'error',
'no-lonely-if': 'error',
'no-misleading-character-class': 'error',
'no-mixed-requires': 'error',
'no-mixed-spaces-and-tabs': 'error',
'no-multi-spaces': ['error', { ignoreEOLComments: true }],
'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 0, maxBOF: 0 }],
'no-new-require': 'error',
'no-new-symbol': 'error',
'no-obj-calls': 'error',
'no-octal': 'error',
'no-path-concat': 'error',
'no-proto': 'error',
'no-redeclare': ['error', { 'builtinGlobals': false }],
'no-restricted-modules': ['error', 'sys'],
/* eslint-disable max-len */
'no-restricted-properties': [
'error',
{
object: 'assert',
property: 'deepEqual',
message: 'Use `assert.deepStrictEqual()`.',
},
{
object: 'assert',
property: 'notDeepEqual',
message: 'Use `assert.notDeepStrictEqual()`.',
},
{
object: 'assert',
property: 'equal',
message: 'Use `assert.strictEqual()` rather than `assert.equal()`.',
},
{
object: 'assert',
property: 'notEqual',
message: 'Use `assert.notStrictEqual()` rather than `assert.notEqual()`.',
},
{
property: '__defineGetter__',
message: '__defineGetter__ is deprecated.',
},
{
property: '__defineSetter__',
message: '__defineSetter__ is deprecated.',
},
],
// If this list is modified, please copy changes that should apply to ./lib
// as well to lib/.eslintrc.yaml.
'no-restricted-syntax': [
'error',
{
selector: "CallExpression[callee.name='setTimeout'][arguments.length<2]",
message: '`setTimeout()` must be invoked with at least two arguments.',
},
{
selector: "CallExpression[callee.name='setInterval'][arguments.length<2]",
message: '`setInterval()` must be invoked with at least two arguments.',
},
{
selector: 'ThrowStatement > CallExpression[callee.name=/Error$/]',
message: 'Use `new` keyword when throwing an `Error`.',
},
{
selector: "CallExpression[callee.name='isNaN']",
message: 'Use Number.isNaN() instead of the global isNaN() function.',
},
],
/* eslint-enable max-len */
'no-return-await': 'error',
'no-self-assign': 'error',
'no-self-compare': 'error',
'no-setter-return': 'error',
'no-shadow-restricted-names': 'error',
'no-tabs': 'error',
'no-template-curly-in-string': 'error',
'no-this-before-super': 'error',
'no-throw-literal': 'error',
'no-trailing-spaces': 'error',
'no-undef': ['error', { typeof: true }],
'no-undef-init': 'error',
'no-unexpected-multiline': 'error',
'no-unreachable': 'error',
'no-unsafe-finally': 'error',
'no-unsafe-negation': 'error',
'no-unused-labels': 'error',
'no-unused-vars': ['error', { args: 'none', caughtErrors: 'all' }],
'no-use-before-define': ['error', {
classes: true,
functions: false,
variables: false,
}],
'no-useless-backreference': 'error',
'no-useless-call': 'error',
'no-useless-catch': 'error',
'no-useless-concat': 'error',
'no-useless-constructor': 'error',
'no-useless-escape': 'error',
'no-useless-return': 'error',
'no-void': 'error',
'no-whitespace-before-property': 'error',
'no-with': 'error',
'object-curly-spacing': ['error', 'always'],
'one-var': ['error', { initialized: 'never' }],
'one-var-declaration-per-line': 'error',
'operator-linebreak': ['error', 'after'],
'padding-line-between-statements': [
'error',
{ blankLine: 'always', prev: 'function', next: 'function' },
],
'prefer-const': ['error', { ignoreReadBeforeAssign: true }],
'quotes': ['error', 'single', { avoidEscape: true }],
'quote-props': ['error', 'consistent'],
'rest-spread-spacing': 'error',
'semi': 'error',
'semi-spacing': 'error',
'space-before-blocks': ['error', 'always'],
'space-before-function-paren': ['error', {
anonymous: 'never',
named: 'never',
asyncArrow: 'always',
}],
'space-in-parens': ['error', 'never'],
'space-infix-ops': 'error',
'space-unary-ops': 'error',
'spaced-comment': ['error', 'always', {
'block': { 'balanced': true },
'exceptions': ['-'],
}],
'strict': ['error', 'global'],
'symbol-description': 'error',
'template-curly-spacing': 'error',
'unicode-bom': 'error',
'use-isnan': 'error',
'valid-typeof': 'error',
// Custom rules from eslint-plugin-node-core
'node-core/no-unescaped-regexp-dot': 'error',
'node-core/no-duplicate-requires': 'error',
},
globals: {
Atomics: 'readable',
BigInt: 'readable',
BigInt64Array: 'readable',
BigUint64Array: 'readable',
TextEncoder: 'readable',
TextDecoder: 'readable',
queueMicrotask: 'readable',
globalThis: 'readable',
},
};