eslint.config.mjs

import js from '@eslint/js';
import stylisticJs from '@stylistic/eslint-plugin-js';

export default [
  js.configs.recommended,
  {
    plugins: {
      '@stylistic/js': stylisticJs,
    },
  },
  {
    files: ['**/*.js'],
    languageOptions: {
      sourceType: 'commonjs',
      globals: {
        Buffer: 'readonly',
        __dirname: 'readonly',
        __filename: 'readonly',
        clearImmediate: 'readonly',
        clearInterval: 'readonly',
        clearTimeout: 'readonly',
        console: 'readonly',
        exports: 'writable',
        global: 'readonly',
        module: 'readonly',
        process: 'readonly',
        require: 'readonly',
        setImmediate: 'readonly',
        setInterval: 'readonly',
        setTimeout: 'readonly',
        URL: 'readonly',
        URLSearchParams: 'readonly',
      },
    },
    rules: {
      // ESLint built-in rules (from Node.js core config).
      'accessor-pairs': 'error',
      'array-callback-return': 'error',
      'block-scoped-var': 'error',
      'default-case-last': 'error',
      'dot-notation': 'error',
      'eqeqeq': ['error', 'smart'],
      'func-name-matching': 'error',
      'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
      'logical-assignment-operators': ['error', 'always', { enforceForIfStatements: true }],
      'no-constant-condition': ['error', { checkLoops: false }],
      'no-constructor-return': 'error',
      'no-duplicate-imports': 'error',
      'no-else-return': 'error',
      'no-inner-declarations': 'off',
      'no-lonely-if': 'error',
      'no-proto': 'error',
      'no-redeclare': ['error', { builtinGlobals: false }],
      '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',
      'prefer-object-spread': 'error',
      'strict': ['error', 'global'],
      'symbol-description': 'error',
      'unicode-bom': 'error',
      'valid-typeof': ['error', { requireStringLiterals: true }],

      // Stylistic rules (from Node.js core config).
      '@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,
        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: 'always' }],
      '@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',
    },
  },
];