eslint.config.js

import js from '@eslint/js';
import typescript from '@typescript-eslint/eslint-plugin';
import typescriptParser from '@typescript-eslint/parser';
import react from 'eslint-plugin-react';
import reactHooks from 'eslint-plugin-react-hooks';

export default [
  {
    ignores: [
      'dist/**',
      'node_modules/**',
      'coverage/**',
      '*.config.ts',
      '*.config.js',
      'omnigrid_server',
    ],
  },
  js.configs.recommended,
  // Scripts run in Node; do not redeclare built-in globals (causes no-redeclare errors in CI).
  {
    files: ['scripts/**/*.mjs', 'scripts/**/*.js'],
    languageOptions: {
      ecmaVersion: 'latest',
      sourceType: 'module',
      globals: {
        // Only non-default / project-specific if needed — process/console are built-ins in Node.
        __dirname: 'readonly',
        __filename: 'readonly',
        module: 'readonly',
        require: 'readonly',
        exports: 'readonly',
        Buffer: 'readonly',
      },
    },
    rules: {
      'no-undef': 'off',
      'no-redeclare': 'off',
    },
  },
  {
    files: ['public/sw.js'],
    languageOptions: {
      globals: {
        self: 'readonly',
        caches: 'readonly',
        fetch: 'readonly',
        Response: 'readonly',
        URL: 'readonly',
      },
    },
  },
  {
    files: ['**/*.{ts,tsx}'],
    languageOptions: {
      parser: typescriptParser,
      parserOptions: {
        ecmaVersion: 'latest',
        sourceType: 'module',
        ecmaFeatures: {
          jsx: true,
        },
      },
      globals: {
        console: 'readonly',
        process: 'readonly',
        __dirname: 'readonly',
        module: 'readonly',
        require: 'readonly',
        exports: 'readonly',
        window: 'readonly',
        document: 'readonly',
        navigator: 'readonly',
        fetch: 'readonly',
        Response: 'readonly',
        URL: 'readonly',
        Blob: 'readonly',
        File: 'readonly',
        FileList: 'readonly',
        FileReader: 'readonly',
        HTMLInputElement: 'readonly',
        HTMLCanvasElement: 'readonly',
        HTMLDivElement: 'readonly',
        HTMLSelectElement: 'readonly',
        HTMLAudioElement: 'readonly',
        HTMLTextAreaElement: 'readonly',
        CanvasRenderingContext2D: 'readonly',
        Element: 'readonly',
        setTimeout: 'readonly',
        clearTimeout: 'readonly',
        setInterval: 'readonly',
        clearInterval: 'readonly',
        requestAnimationFrame: 'readonly',
        cancelAnimationFrame: 'readonly',
        alert: 'readonly',
        confirm: 'readonly',
        prompt: 'readonly',
        KeyboardEvent: 'readonly',
        MouseEvent: 'readonly',
        Event: 'readonly',
        crypto: 'readonly',
        btoa: 'readonly',
        atob: 'readonly',
        TextEncoder: 'readonly',
        TextDecoder: 'readonly',
        AudioContext: 'readonly',
        AudioNode: 'readonly',
        AudioBufferSourceNode: 'readonly',
        GainNode: 'readonly',
        OscillatorNode: 'readonly',
        AnalyserNode: 'readonly',
        MediaStreamAudioSourceNode: 'readonly',
        localStorage: 'readonly',
        CryptoKey: 'readonly',
        ResizeObserver: 'readonly',
        globalThis: 'readonly',
      },
    },
    plugins: {
      '@typescript-eslint': typescript,
      react,
      'react-hooks': reactHooks,
    },
    rules: {
      ...typescript.configs.recommended.rules,
      ...react.configs.recommended.rules,
      ...reactHooks.configs.recommended.rules,
      'no-undef': 'off',
      'react/react-in-jsx-scope': 'off',
      'react/prop-types': 'off',
      // Keep as warn so existing intentional `any` does not fail CI; tighten over time.
      '@typescript-eslint/no-explicit-any': 'warn',
      '@typescript-eslint/no-unused-vars': [
        'error',
        {
          argsIgnorePattern: '^_',
          varsIgnorePattern: '^_',
          caughtErrorsIgnorePattern: '^_',
        },
      ],
      'no-console': ['warn', { allow: ['warn', 'error'] }],
      // Disable React Compiler specific rules that conflict with manual memoization
      'react-hooks/preserve-manual-memoization': 'off',
      'react-hooks/unsupported-syntax': 'off',
      'react-compiler/react-compiler': 'off',
      // Downgrade purity rule: it incorrectly flags Date.now() in event handlers
      'react-hooks/purity': 'warn',
      // Missing deps in large containers — warn, do not fail CI
      'react-hooks/exhaustive-deps': 'warn',
    },
    settings: {
      react: {
        version: 'detect',
      },
    },
  },
];