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/**

* @license

* Copyright 2025 Google LLC

* SPDX-License-Identifier: Apache-2.0

*/

import js from '@eslint/js';

import stylisticPlugin from '@stylistic/eslint-plugin';

import {defineConfig, globalIgnores} from 'eslint/config';

import importPlugin from 'eslint-plugin-import';

import globals from 'globals';

import tseslint from 'typescript-eslint';

import localPlugin from './scripts/eslint_rules/local-plugin.js';

export default defineConfig([

globalIgnores([

'**/node_modules',

'**/build/',

'tests/tools/fixtures/',

'src/third_party/lighthouse-devtools-mcp-bundle.js',

]),

importPlugin.flatConfigs.typescript,

{

languageOptions: {

ecmaVersion: 'latest',

sourceType: 'module',

globals: {

...globals.node,

},

parserOptions: {

projectService: {

allowDefaultProject: [

'.prettierrc.cjs',

'puppeteer.config.cjs',

'eslint.config.mjs',

'rollup.config.mjs',

'skills/memory-leak-debugging/references/compare_snapshots.js',

],

},

},

parser: tseslint.parser,

},

plugins: {

js,

'@local': localPlugin,

'@typescript-eslint': tseslint.plugin,

'@stylistic': stylisticPlugin,

},

settings: {

'import/resolver': {

typescript: true,

},

},

extends: ['js/recommended'],

},

tseslint.configs.recommended,

tseslint.configs.stylistic,

{

name: 'TypeScript rules',

rules: {

'@local/check-license': 'error',

curly: ['error', 'all'],

'no-undef': 'off',

'no-unused-vars': 'off',

'@typescript-eslint/no-unused-vars': [

'error',

{

argsIgnorePattern: '^_',

varsIgnorePattern: '^_',

},

],

'@typescript-eslint/no-explicit-any': [

'error',

{

ignoreRestArgs: true,

},

],

// This optimizes the dependency tracking for type-only files.

'@typescript-eslint/consistent-type-imports': 'error',

// So type-only exports get elided.

'@typescript-eslint/consistent-type-exports': 'error',

// Prefer interfaces over types for shape like.

'@typescript-eslint/consistent-type-definitions': ['error', 'interface'],

'@typescript-eslint/array-type': [

'error',

{

default: 'array-simple',

},

],

'@typescript-eslint/no-floating-promises': 'error',

'import/order': [

'error',

{

'newlines-between': 'always',

alphabetize: {

order: 'asc',

caseInsensitive: true,

},

},

],

'import/no-cycle': [

'error',

{

maxDepth: Infinity,

},

],

'import/enforce-node-protocol-usage': ['error', 'always'],

'@stylistic/function-call-spacing': 'error',

'@stylistic/semi': 'error',

'no-restricted-imports': [

'error',

{

patterns: [

{

regex: '.*chrome-devtools-frontend/(?!mcp/mcp.js$).*',

message:

'Import only the devtools-frontend code exported via node_modules/chrome-devtools-frontend/mcp/mcp.js',

},

],

},

],

},

},

{

name: 'Source files',

files: ['src/**/*.ts'],

rules: {

'@local/no-direct-third-party-imports': 'error',

},

},

{

name: 'Tools definitions',

files: ['src/tools/**/*.ts'],

rules: {

'@local/enforce-zod-schema': 'error',

},

},

{

name: 'Tests',

files: ['**/*.test.ts'],

rules: {

// With the Node.js test runner, `describe` and `it` are technically

// promises, but we don't need to await them.

'@typescript-eslint/no-floating-promises': 'off',

},

},

]);