eslint.config.js

import eslint from '@eslint/js';
import tseslint from '@typescript-eslint/eslint-plugin';
import tsparser from '@typescript-eslint/parser';
import importPlugin from 'eslint-plugin-import';

export default [
  {
    ignores: [
      '**/node_modules/**',
      '**/dist/**',
      '**/build/**',
      '**/.next/**',
      '**/coverage/**',
      '**/*.min.js',
      '**/.turbo/**',
      '**/.vercel/**',
      '**/.tsup/**',
      'packages/*/dist/**',
      'packages/*/build/**',
      'packages/*/node_modules/**',
    ],
  },
  {
    files: ['**/*.js', '**/*.jsx', '**/*.ts', '**/*.tsx', '**/*.mts'],
    languageOptions: {
      parser: tsparser,
      parserOptions: {
        ecmaVersion: 2022,
        sourceType: 'module',
      },
      globals: {
        // Node.js globals
        __dirname: 'readonly',
        __filename: 'readonly',
        exports: 'writable',
        module: 'readonly',
        require: 'readonly',
        process: 'readonly',
        Buffer: 'readonly',
        console: 'readonly',
        setTimeout: 'readonly',
        clearTimeout: 'readonly',
        setInterval: 'readonly',
        clearInterval: 'readonly',
        setImmediate: 'readonly',
        clearImmediate: 'readonly',
        NodeJS: 'readonly',
        // ES6+ globals
        Promise: 'readonly',
        Map: 'readonly',
        Set: 'readonly',
        WeakMap: 'readonly',
        WeakSet: 'readonly',
        Symbol: 'readonly',
        Proxy: 'readonly',
        Reflect: 'readonly',
        // Web APIs available in both Node.js and browsers
        fetch: 'readonly',
        URL: 'readonly',
        URLSearchParams: 'readonly',
        AbortController: 'readonly',
        AbortSignal: 'readonly',
        ReadableStream: 'readonly',
        TextDecoder: 'readonly',
        TextEncoder: 'readonly',
        WebSocket: 'readonly',
        Response: 'readonly',
        Request: 'readonly',
        Headers: 'readonly',
        btoa: 'readonly',
        atob: 'readonly',
        // Browser globals
        window: 'readonly',
        document: 'readonly',
        navigator: 'readonly',
        location: 'readonly',
        localStorage: 'readonly',
        sessionStorage: 'readonly',
        // HTML Element types
        HTMLInputElement: 'readonly',
        HTMLButtonElement: 'readonly',
        HTMLDivElement: 'readonly',
        HTMLSpanElement: 'readonly',
        HTMLTextAreaElement: 'readonly',
        HTMLElement: 'readonly',
        // Browser APIs
        MutationObserver: 'readonly',
        ResizeObserver: 'readonly',
        queueMicrotask: 'readonly',
        FileReader: 'readonly',
        // React
        React: 'readonly',
      },
    },
    plugins: {
      '@typescript-eslint': tseslint,
      import: importPlugin,
    },
    settings: {
      'import/resolver': {
        typescript: true,
      },
    },
    rules: {
      'array-callback-return': 'error',
      'default-case': ['error', { commentPattern: '^no default$' }],
      'dot-location': ['error', 'property'],
      eqeqeq: ['error', 'smart'],
      'new-parens': 'error',
      'no-array-constructor': 'error',
      'no-caller': 'error',
      'no-cond-assign': ['error', 'except-parens'],
      'no-const-assign': 'error',
      'no-control-regex': 'error',
      'no-delete-var': 'error',
      'no-dupe-args': 'error',
      'no-dupe-class-members': 'error',
      'no-dupe-keys': 'error',
      'no-duplicate-case': 'error',
      'no-empty-character-class': 'error',
      'no-empty-pattern': 'error',
      'no-eval': 'error',
      'no-ex-assign': 'error',
      'no-extend-native': 'error',
      'no-extra-bind': 'error',
      'no-extra-label': 'error',
      'no-fallthrough': 'error',
      'no-func-assign': 'error',
      'no-implied-eval': 'error',
      'no-invalid-regexp': 'error',
      'no-iterator': 'error',
      'no-label-var': 'error',
      'no-labels': ['error', { allowLoop: true, allowSwitch: false }],
      'no-lone-blocks': 'error',
      'no-loop-func': 'error',
      'no-multi-str': 'error',
      'no-new-func': 'error',
      'no-new-object': 'error',
      'no-new-symbol': 'error',
      'no-new-wrappers': 'error',
      'no-obj-calls': 'error',
      'no-octal': 'error',
      'no-octal-escape': 'error',
      'no-regex-spaces': 'error',
      'no-restricted-syntax': [
        'error',
        'WithStatement',
        {
          message: "substr() is deprecated, use slice() or substring() instead",
          selector: "MemberExpression > Identifier[name='substr']",
        },
      ],
      'no-script-url': 'error',
      'no-self-assign': 'error',
      'no-self-compare': 'error',
      'no-sequences': 'error',
      'no-shadow': 'warn',
      'no-shadow-restricted-names': 'error',
      'no-sparse-arrays': 'error',
      'no-template-curly-in-string': 'error',
      'no-this-before-super': 'error',
      'no-throw-literal': 'error',
      'no-undef': 'error',
      'no-unexpected-multiline': 'error',
      'no-unreachable': 'error',
      'no-unused-expressions': [
        'error',
        {
          allowShortCircuit: true,
          allowTernary: true,
          allowTaggedTemplates: true,
        },
      ],
      'no-unused-labels': 'error',
      'no-unused-vars': 'off',
      'no-useless-computed-key': 'error',
      'no-useless-concat': 'error',
      'no-useless-constructor': 'off',
      'no-useless-escape': 'error',
      'no-useless-rename': [
        'error',
        {
          ignoreDestructuring: false,
          ignoreImport: false,
          ignoreExport: false,
        },
      ],
      'no-with': 'error',
      'no-whitespace-before-property': 'error',
      'require-yield': 'error',
      'rest-spread-spacing': ['error', 'never'],
      strict: ['error', 'never'],
      'unicode-bom': ['error', 'never'],
      'use-isnan': 'error',
      'valid-typeof': 'error',
      'getter-return': 'error',
      'prefer-const': 'error',
      '@typescript-eslint/prefer-as-const': 'error',
      '@typescript-eslint/no-redeclare': [
        'error',
        { builtinGlobals: false, ignoreDeclarationMerge: true },
      ],
    },
  },
  // TypeScript files
  {
    files: ['**/*.ts', '**/*.tsx', '**/*.mts'],
    languageOptions: {
      parser: tsparser,
      parserOptions: {
        ecmaVersion: 2022,
        sourceType: 'module',
      },
    },
    rules: {
      ...eslint.configs.recommended.rules,
      ...tseslint.configs.recommended.rules,
      '@typescript-eslint/no-explicit-any': 'off',
      '@typescript-eslint/no-unused-vars': [
        'error',
        {
          args: 'none',
          ignoreRestSiblings: true,
          argsIgnorePattern: '^_',
          caughtErrors: 'none',
          caughtErrorsIgnorePattern: '^_',
          destructuredArrayIgnorePattern: '^_',
          varsIgnorePattern: '^_',
        },
      ],
      '@typescript-eslint/no-empty-function': 'off',
      '@typescript-eslint/no-namespace': 'off',
      '@typescript-eslint/no-var-requires': 'off',
      '@typescript-eslint/ban-ts-comment': 'off',
      '@typescript-eslint/consistent-type-imports': [
        'error',
        {
          disallowTypeAnnotations: false,
        },
      ],
      '@typescript-eslint/no-import-type-side-effects': 'error',
      'no-use-before-define': 'off',
      '@typescript-eslint/no-use-before-define': 'off',
      'no-case-declarations': 'warn',
      'no-constant-condition': 'warn',
    },
  },
  // CLI packages
  {
    files: [
      'packages/cli/**/*.ts',
      'packages/create-mcp-use-app/**/*.ts',
    ],
    rules: {
      'no-console': 'off',
      'no-process-exit': 'off',
    },
  },
  // mcp-use-ts package
  {
    files: ['packages/mcp-use-ts/**/*.ts'],
    rules: {
      'import/no-extraneous-dependencies': [
        'error',
        { devDependencies: false },
      ],
    },
  },
  // Test files
  {
    files: [
      '**/*.test.ts',
      '**/*.test.tsx',
      '**/*.spec.ts',
      '**/*.spec.tsx',
      'tests/**/*.ts',
      '**/vitest.config.ts',
      '**/vitest.config.mts',
    ],
    languageOptions: {
      globals: {
        describe: 'readonly',
        it: 'readonly',
        test: 'readonly',
        expect: 'readonly',
        beforeEach: 'readonly',
        afterEach: 'readonly',
        beforeAll: 'readonly',
        afterAll: 'readonly',
        jest: 'readonly',
        vi: 'readonly',
      },
    },
    rules: {
      'no-unused-vars': 'off',
      '@typescript-eslint/no-unused-vars': 'off',
      'no-unreachable-loop': 'off',
      'no-console': 'off',
      'import/no-extraneous-dependencies': 'off',
      '@typescript-eslint/no-explicit-any': 'off',
      'no-shadow': 'off',
      '@typescript-eslint/no-shadow': 'off',
      'no-constant-condition': 'off',
      'require-yield': 'off',
    },
  },
  // Examples
  {
    files: ['examples/**/*', 'packages/*/examples/**/*'],
    rules: {
      'import/no-extraneous-dependencies': 'off',
      'no-console': 'off',
      '@typescript-eslint/no-unused-vars': 'off',
      'no-constant-condition': 'off',
      'default-case': 'off',
      'no-new-func': 'off',
      'no-useless-escape': 'off',
      'no-case-declarations': 'off',
      'require-yield': 'off',
    },
  },
];