/** * @license * Copyright 2025 Google LLC * SPDX-License-Identifier: Apache-2.0 */ import eslint from '@eslint/js'; import tseslint from 'typescript-eslint'; import reactPlugin from 'eslint-plugin-react'; import reactHooks from 'eslint-plugin-react-hooks'; import prettierConfig from 'eslint-config-prettier'; import importPlugin from 'eslint-plugin-import'; import vitest from '@vitest/eslint-plugin'; import globals from 'globals'; import headers from 'eslint-plugin-headers'; import path from 'node:path'; import url from 'node:url'; // --- ESM way to get __dirname --- const __filename = url.fileURLToPath(import.meta.url); const __dirname = path.dirname(__filename); // --- --- // Determine the monorepo root (assuming eslint.config.js is at the root) const projectRoot = __dirname; const currentYear = new Date().getFullYear(); const commonRestrictedSyntaxRules = [ { selector: 'CallExpression[callee.name="require"]', message: 'Avoid using require(). Use ES6 imports instead.', }, { selector: 'ThrowStatement > Literal:not([value=/^\\w+Error:/])', message: 'Do not throw string literals or non-Error objects. Throw new Error("...") instead.', }, ]; export default tseslint.config( { // Global ignores ignores: [ 'node_modules/*', 'eslint.config.js', 'packages/**/dist/**', 'bundle/**', 'package/bundle/**', '.integration-tests/**', 'dist/**', 'evals/**', 'packages/test-utils/**', '.gemini/skills/**', ], }, eslint.configs.recommended, ...tseslint.configs.recommended, reactHooks.configs['recommended-latest'], reactPlugin.configs.flat.recommended, reactPlugin.configs.flat['jsx-runtime'], // Add this if you are using React 17+ { // Settings for eslint-plugin-react settings: { react: { version: 'detect', }, }, }, { // Rules for packages/*/src (TS/TSX) files: ['packages/*/src/**/*.{ts,tsx}'], plugins: { import: importPlugin, }, settings: { 'import/resolver': { node: true, }, }, languageOptions: { parser: tseslint.parser, parserOptions: { projectService: true, tsconfigRootDir: projectRoot, }, globals: { ...globals.node, ...globals.es2021, }, }, rules: { ...importPlugin.configs.recommended.rules, ...importPlugin.configs.typescript.rules, 'import/no-default-export': 'warn', 'import/no-unresolved': 'off', 'import/no-duplicates': 'error', // General Best Practice Rules (subset adapted for flat config) '@typescript-eslint/array-type': ['error', { default: 'array-simple' }], 'arrow-body-style': ['error', 'as-needed'], curly: ['error', 'multi-line'], eqeqeq: ['error', 'always', { null: 'ignore' }], '@typescript-eslint/consistent-type-assertions': [ 'error', { assertionStyle: 'as' }, ], '@typescript-eslint/explicit-member-accessibility': [ 'error', { accessibility: 'no-public' }, ], '@typescript-eslint/no-explicit-any': 'error', '@typescript-eslint/no-inferrable-types': [ 'error', { ignoreParameters: true, ignoreProperties: true }, ], '@typescript-eslint/consistent-type-imports': [ 'error', { disallowTypeAnnotations: false }, ], '@typescript-eslint/no-namespace': ['error', { allowDeclarations: true }], '@typescript-eslint/no-unused-vars': [ 'error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_', }, ], // Prevent async errors from bypassing catch handlers '@typescript-eslint/return-await': ['error', 'in-try-catch'], 'import/no-internal-modules': 'off', 'import/no-relative-packages': 'error', 'no-cond-assign': 'error', 'no-debugger': 'error', 'no-duplicate-case': 'error', 'no-restricted-syntax': ['error', ...commonRestrictedSyntaxRules], 'no-unsafe-finally': 'error', 'no-unused-expressions': 'off', // Disable base rule '@typescript-eslint/no-unused-expressions': [ // Enable TS version 'error', { allowShortCircuit: true, allowTernary: true }, ], 'no-var': 'error', 'object-shorthand': 'error', 'one-var': ['error', 'never'], 'prefer-arrow-callback': 'error', 'prefer-const': ['error', { destructuring: 'all' }], radix: 'error', 'no-console': 'error', 'default-case': 'error', '@typescript-eslint/await-thenable': ['error'], '@typescript-eslint/no-floating-promises': ['error'], '@typescript-eslint/no-unnecessary-type-assertion': ['error'], 'no-restricted-imports': [ 'error', { paths: [ { name: 'node:os', importNames: ['homedir', 'tmpdir'], message: 'Please use the helpers from @google/gemini-cli-core instead of node:os homedir()/tmpdir() to ensure strict environment isolation.', }, { name: 'os', importNames: ['homedir', 'tmpdir'], message: 'Please use the helpers from @google/gemini-cli-core instead of os homedir()/tmpdir() to ensure strict environment isolation.', }, ], }, ], }, }, { // API Response Optionality enforcement for Code Assist files: ['packages/core/src/code_assist/**/*.{ts,tsx}'], rules: { 'no-restricted-syntax': [ 'error', ...commonRestrictedSyntaxRules, { selector: 'TSInterfaceDeclaration[id.name=/.+Response$/] TSPropertySignature:not([optional=true])', message: 'All fields in API response interfaces (*Response) must be marked as optional (?) to prevent developers from accidentally assuming a field will always be present based on current backend behavior.', }, { selector: 'TSTypeAliasDeclaration[id.name=/.+Response$/] TSPropertySignature:not([optional=true])', message: 'All fields in API response types (*Response) must be marked as optional (?) to prevent developers from accidentally assuming a field will always be present based on current backend behavior.', }, ], }, }, { // Rules that only apply to product code files: ['packages/*/src/**/*.{ts,tsx}'], ignores: ['**/*.test.ts', '**/*.test.tsx'], rules: { '@typescript-eslint/no-unsafe-type-assertion': 'error', '@typescript-eslint/no-unsafe-assignment': 'error', '@typescript-eslint/no-unsafe-return': 'error', }, }, { // Allow os.homedir() in tests and paths.ts where it is used to implement the helper files: [ '**/*.test.ts', '**/*.test.tsx', 'packages/core/src/utils/paths.ts', 'packages/test-utils/src/**/*.ts', 'scripts/**/*.js', ], rules: { 'no-restricted-imports': 'off', }, }, { // Prevent self-imports in packages files: ['packages/core/src/**/*.{ts,tsx}'], rules: { 'no-restricted-imports': [ 'error', { name: '@google/gemini-cli-core', message: 'Please use relative imports within the @google/gemini-cli-core package.', }, ], }, }, { files: ['packages/cli/src/**/*.{ts,tsx}'], rules: { 'no-restricted-imports': [ 'error', { name: '@google/gemini-cli', message: 'Please use relative imports within the @google/gemini-cli package.', }, ], }, }, { files: ['packages/sdk/src/**/*.{ts,tsx}'], rules: { 'no-restricted-imports': [ 'error', { name: '@google/gemini-cli-sdk', message: 'Please use relative imports within the @google/gemini-cli-sdk package.', }, ], }, }, { files: ['packages/*/src/**/*.test.{ts,tsx}'], plugins: { vitest, }, rules: { ...vitest.configs.recommended.rules, 'vitest/expect-expect': 'off', 'vitest/no-commented-out-tests': 'off', }, }, { files: ['./**/*.{tsx,ts,js,cjs}'], plugins: { headers, import: importPlugin, }, rules: { 'headers/header-format': [ 'error', { source: 'string', content: [ '@license', 'Copyright (year) Google LLC', 'SPDX-License-Identifier: Apache-2.0', ].join('\n'), patterns: { year: { pattern: `202[5-${currentYear.toString().slice(-1)}]`, defaultValue: currentYear.toString(), }, }, }, ], 'import/enforce-node-protocol-usage': ['error', 'always'], }, }, { files: ['./scripts/**/*.js', 'esbuild.config.js'], languageOptions: { globals: { ...globals.node, process: 'readonly', console: 'readonly', }, }, rules: { '@typescript-eslint/no-unused-vars': [ 'error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_', }, ], }, }, { files: ['**/*.cjs'], languageOptions: { sourceType: 'commonjs', globals: { ...globals.node, }, }, rules: { 'no-restricted-syntax': 'off', 'no-console': 'off', 'no-empty': 'off', 'no-redeclare': 'off', '@typescript-eslint/no-require-imports': 'off', '@typescript-eslint/no-unused-vars': [ 'error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_', }, ], }, }, { files: ['packages/vscode-ide-companion/esbuild.js'], languageOptions: { globals: { ...globals.node, process: 'readonly', console: 'readonly', }, }, rules: { 'no-restricted-syntax': 'off', '@typescript-eslint/no-require-imports': 'off', }, }, // Examples should have access to standard globals like fetch { files: ['packages/cli/src/commands/extensions/examples/**/*.js'], languageOptions: { globals: { ...globals.node, fetch: 'readonly', }, }, }, // extra settings for scripts that we run directly with node { files: ['packages/vscode-ide-companion/scripts/**/*.js'], languageOptions: { globals: { ...globals.node, process: 'readonly', console: 'readonly', }, }, rules: { 'no-restricted-syntax': 'off', '@typescript-eslint/no-require-imports': 'off', }, }, // Prettier config must be last prettierConfig, // extra settings for scripts that we run directly with node { files: ['./integration-tests/**/*.js'], languageOptions: { globals: { ...globals.node, process: 'readonly', console: 'readonly', }, }, rules: { '@typescript-eslint/no-unused-vars': [ 'error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrorsIgnorePattern: '^_', }, ], }, }, );