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import { readdirSync } from 'node:fs';
import Module from 'node:module';
import { fileURLToPath, URL } from 'node:url';
import benchmarkConfig from './benchmark/eslint.config_partial.mjs';
import docConfig from './doc/eslint.config_partial.mjs';
import libConfig from './lib/eslint.config_partial.mjs';
import testConfig from './test/eslint.config_partial.mjs';
import toolsConfig from './tools/eslint/eslint.config_partial.mjs';
import {
importEslintTool,
noRestrictedSyntaxCommonAll,
noRestrictedSyntaxCommonLib,
resolveEslintTool,
} from './tools/eslint/eslint.config_utils.mjs';
import nodeCore from './tools/eslint/eslint-plugin-node-core.js';
const { globalIgnores } = await importEslintTool('eslint/config');
const { default: js } = await importEslintTool('@eslint/js');
const { default: babelEslintParser } = await importEslintTool('@babel/eslint-parser');
const babelPluginProposalExplicitResourceManagement =
resolveEslintTool('@babel/plugin-proposal-explicit-resource-management');
const babelPluginSyntaxImportAttributes = resolveEslintTool('@babel/plugin-syntax-import-attributes');
const babelPluginSyntaxImportSource = resolveEslintTool('@babel/plugin-syntax-import-source');
const { default: jsdoc } = await importEslintTool('eslint-plugin-jsdoc');
const { default: markdown } = await importEslintTool('eslint-plugin-markdown');
const { default: stylisticJs } = await importEslintTool('@stylistic/eslint-plugin');
nodeCore.RULES_DIR = fileURLToPath(new URL('./tools/eslint-rules', import.meta.url));
function filterFilesInDir(dirpath, filterFn) {
return readdirSync(dirpath)
.filter(filterFn)
.map((f) => `${dirpath}/${f}`);
}
// The Module._resolveFilename() monkeypatching is to make it so that ESLint is able to
// dynamically load extra modules that we install with it.
const ModuleResolveFilename = Module._resolveFilename;
const hacks = [
'eslint-formatter-tap',
];
Module._resolveFilename = (request, parent, isMain, options) => {
if (hacks.includes(request) && parent.id.endsWith('__placeholder__.js')) {
return resolveEslintTool(request);
}
return ModuleResolveFilename(request, parent, isMain, options);
};
export default [
// #region ignores
globalIgnores([
'**/node_modules/**',
'benchmark/fixtures/**',
'benchmark/tmp/**',
'doc/changelogs/CHANGELOG_V1*.md',
'!doc/changelogs/CHANGELOG_V18.md',
'lib/punycode.js',
'test/.tmp.*/**',
'test/addons/??_*',
// We want to lint only a few specific fixtures folders
'test/fixtures/*',
'!test/fixtures/console',
'!test/fixtures/errors',
'!test/fixtures/eval',
'!test/fixtures/source-map',
'test/fixtures/source-map/*',
'!test/fixtures/source-map/output',
...filterFilesInDir(
'test/fixtures/source-map/output',
// Filtering tsc output files (i.e. if there a foo.ts, we ignore foo.js):
(f, _, files) => f.endsWith('js') && files.includes(f.replace(/(\.[cm]?)js$/, '$1ts')),
),
'!test/fixtures/test-runner',
'test/fixtures/test-runner/*',
'!test/fixtures/test-runner/output',
...filterFilesInDir(
'test/fixtures/test-runner/output',
// Filtering tsc output files (i.e. if there a foo.ts, we ignore foo.js):
(f, _, files) => f.endsWith('js') && files.includes(f.replace(/\.[cm]?js$/, '.ts')),
),
'!test/fixtures/v8',
'!test/fixtures/vm',
]),
// #endregion
// #region general config
js.configs.recommended,
jsdoc.configs['flat/recommended'],
{
files: ['**/*.{js,cjs}'],
languageOptions: {
// The default is `commonjs` but it's not supported by the Babel parser.
sourceType: 'script',
},
},
{
plugins: {
jsdoc,
'@stylistic/js': stylisticJs,
'node-core': nodeCore,
},
languageOptions: {
parser: babelEslintParser,
parserOptions: {
babelOptions: {
parserOpts: { createImportExpressions: true },
plugins: [
babelPluginProposalExplicitResourceManagement,
babelPluginSyntaxImportAttributes,
babelPluginSyntaxImportSource,
],
},
requireConfigFile: false,
},
},
},
// #endregion
// #region general globals
{
languageOptions: {
globals: {
AsyncDisposableStack: 'readonly',
ByteLengthQueuingStrategy: 'readonly',
CompressionStream: 'readonly',
CountQueuingStrategy: 'readonly',
CustomEvent: 'readonly',
crypto: 'readonly',
Crypto: 'readonly',
CryptoKey: 'readonly',
DecompressionStream: 'readonly',
DisposableStack: 'readonly',
EventSource: 'readable',
fetch: 'readonly',
Float16Array: 'readonly',
FormData: 'readonly',
navigator: 'readonly',
ReadableStream: 'readonly',
ReadableStreamDefaultReader: 'readonly',
ReadableStreamBYOBReader: 'readonly',
ReadableStreamBYOBRequest: 'readonly',
ReadableByteStreamController: 'readonly',
ReadableStreamDefaultController: 'readonly',
Response: 'readonly',
TextDecoderStream: 'readonly',
TextEncoderStream: 'readonly',
TransformStream: 'readonly',
TransformStreamDefaultController: 'readonly',
ShadowRealm: 'readonly',
SubtleCrypto: 'readonly',
WritableStream: 'readonly',
WritableStreamDefaultWriter: 'readonly',
WritableStreamDefaultController: 'readonly',
WebSocket: 'readonly',
},
},
},
// #endregion
// #region general rules
{
rules: {
// ESLint built-in rules
// https://eslint.org/docs/latest/rules/
'accessor-pairs': 'error',
'array-callback-return': 'error',
'block-scoped-var': 'error',
'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.
ignorePattern: '.{0,20}$|[a-z]+ ?[0-9A-Z_.(/=:[#-]|std|http|ssh|ftp',
ignoreInlineComments: true,
ignoreConsecutiveComments: true,
},
block: {
ignorePattern: '.*',
},
}],
'logical-assignment-operators': ['error', 'always', { enforceForIfStatements: true }],
'default-case-last': 'error',
'dot-notation': 'error',
'eqeqeq': ['error', 'smart'],
'func-name-matching': 'error',
'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
'no-constant-condition': ['error', { checkLoops: false }],
'no-constructor-return': 'error',
'no-duplicate-imports': 'error',
'no-else-return': 'error',
'no-lonely-if': 'error',
'no-mixed-requires': 'error',
'no-new-require': 'error',
'no-path-concat': 'error',
'no-proto': 'error',
'no-redeclare': ['error', { builtinGlobals: false }],
'no-restricted-modules': ['error', 'sys'],
'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.',
},
{
property: 'webcrypto',
message: 'Use `globalThis.crypto`.',
},
],
'no-restricted-syntax': [
'error',
...noRestrictedSyntaxCommonAll,
...noRestrictedSyntaxCommonLib,
],
'no-self-compare': 'error',
'no-template-curly-in-string': 'error',
'no-throw-literal': 'error',
'no-undef': ['error', { typeof: true }],
'no-undef-init': 'error',
'no-unused-expressions': ['error', { allowShortCircuit: true }],
'no-unused-vars': ['error', { args: 'none', caughtErrors: 'all' }],
'no-use-before-define': ['error', {
classes: true,
functions: false,
variables: false,
}],
'no-useless-call': 'error',
'no-useless-concat': 'error',
'no-useless-constructor': 'error',
'no-useless-return': 'error',
'no-var': 'error',
'no-void': 'error',
'one-var': ['error', { initialized: 'never' }],
'prefer-const': ['error', { ignoreReadBeforeAssign: true }],
'prefer-object-has-own': 'error',
'strict': ['error', 'global'],
'symbol-description': 'error',
'unicode-bom': 'error',
'valid-typeof': ['error', { requireStringLiterals: true }],
// ESLint recommended rules that we disable.
'no-inner-declarations': 'off',
// JSDoc rules.
'jsdoc/require-jsdoc': 'off',
'jsdoc/require-param-description': 'off',
'jsdoc/require-returns-description': 'off',
'jsdoc/valid-types': 'error',
'jsdoc/no-defaults': 'error',
'jsdoc/no-undefined-types': 'off',
'jsdoc/require-param': 'off',
'jsdoc/check-tag-names': 'error',
'jsdoc/require-returns': 'error',
'jsdoc/check-line-alignment': ['error', 'any', {
tags: ['param', 'property', 'returns', 'file'],
wrapIndent: ' ',
}],
'jsdoc/check-alignment': 'error',
// Stylistic rules.
'@stylistic/js/arrow-parens': 'error',
'@stylistic/js/arrow-spacing': 'error',
'@stylistic/js/block-spacing': 'error',
'@stylistic/js/brace-style': ['error', '1tbs', { allowSingleLine: true }],
'@stylistic/js/comma-dangle': ['error', 'always-multiline'],
'@stylistic/js/comma-spacing': 'error',
'@stylistic/js/comma-style': 'error',
'@stylistic/js/computed-property-spacing': 'error',
'@stylistic/js/dot-location': ['error', 'property'],
'@stylistic/js/eol-last': 'error',
'@stylistic/js/function-call-spacing': 'error',
'@stylistic/js/indent': ['error', 2, {
ArrayExpression: 'first',
CallExpression: { arguments: 'first' },
FunctionDeclaration: { parameters: 'first' },
FunctionExpression: { parameters: 'first' },
MemberExpression: 'off',
ObjectExpression: 'first',
SwitchCase: 1,
}],
'@stylistic/js/key-spacing': 'error',
'@stylistic/js/keyword-spacing': 'error',
'@stylistic/js/linebreak-style': 'error',
'@stylistic/js/max-len': ['error', {
code: 120,
ignorePattern: '^// Flags:',
ignoreRegExpLiterals: true,
ignoreTemplateLiterals: true,
ignoreUrls: true,
tabWidth: 2,
}],
'@stylistic/js/new-parens': 'error',
'@stylistic/js/no-confusing-arrow': 'error',
'@stylistic/js/no-extra-parens': ['error', 'functions'],
'@stylistic/js/no-multi-spaces': ['error', { ignoreEOLComments: true }],
'@stylistic/js/no-multiple-empty-lines': ['error', { max: 2, maxEOF: 0, maxBOF: 0 }],
'@stylistic/js/no-tabs': 'error',
'@stylistic/js/no-trailing-spaces': 'error',
'@stylistic/js/no-whitespace-before-property': 'error',
'@stylistic/js/object-curly-newline': 'error',
'@stylistic/js/object-curly-spacing': ['error', 'always'],
'@stylistic/js/one-var-declaration-per-line': 'error',
'@stylistic/js/operator-linebreak': ['error', 'after'],
'@stylistic/js/padding-line-between-statements': [
'error',
{ blankLine: 'always', prev: 'function', next: 'function' },
],
'@stylistic/js/quotes': ['error', 'single', { avoidEscape: true, allowTemplateLiterals: true }],
'@stylistic/js/quote-props': ['error', 'consistent'],
'@stylistic/js/rest-spread-spacing': 'error',
'@stylistic/js/semi': 'error',
'@stylistic/js/semi-spacing': 'error',
'@stylistic/js/space-before-blocks': ['error', 'always'],
'@stylistic/js/space-before-function-paren': ['error', {
anonymous: 'never',
named: 'never',
asyncArrow: 'always',
}],
'@stylistic/js/space-in-parens': 'error',
'@stylistic/js/space-infix-ops': 'error',
'@stylistic/js/space-unary-ops': 'error',
'@stylistic/js/spaced-comment': ['error', 'always', {
'block': { 'balanced': true },
'exceptions': ['-'],
}],
'@stylistic/js/template-curly-spacing': 'error',
// Custom rules in tools/eslint-rules.
'node-core/no-unescaped-regexp-dot': 'error',
'node-core/no-duplicate-requires': 'error',
'node-core/prefer-proto': 'error',
'node-core/prefer-optional-chaining': 'error',
},
},
// #endregion
// #region markdown config
{
files: ['**/*.md'],
plugins: {
markdown,
},
processor: 'markdown/markdown',
},
{
files: ['**/*.md/*.{js,cjs}'],
languageOptions: {
parserOptions: {
ecmaFeatures: { impliedStrict: true },
},
},
rules: { strict: 'off' },
},
{
files: [
'**/*.md/*.mjs',
'doc/api/esm.md/*.js',
'doc/api/packages.md/*.js',
],
languageOptions: {
sourceType: 'module',
},
rules: { 'no-restricted-globals': [
'error',
{
name: '__filename',
message: 'Use import.meta.url instead.',
},
{
name: '__dirname',
message: 'Not available in ESM.',
},
{
name: 'exports',
message: 'Not available in ESM.',
},
{
name: 'module',
message: 'Not available in ESM.',
},
{
name: 'require',
message: 'Use import instead.',
},
{
name: 'Buffer',
message: "Import 'Buffer' instead of using the global.",
},
{
name: 'process',
message: "Import 'process' instead of using the global.",
},
] },
},
// #endregion
// #region partials
...benchmarkConfig,
...docConfig,
...libConfig,
...testConfig,
...toolsConfig,
// #endregion
];