.eslintrc.js

module.exports = {
  root: true,
  env: {
    browser: true,
    es2021: true,
    node: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/recommended-requiring-type-checking',
    'prettier',
  ],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module',
    project: ['./tsconfig.json', './tsconfig.*.json'],
    tsconfigRootDir: __dirname,
  },
  plugins: ['@typescript-eslint', 'import'],
  rules: {
    // TypeScript 嚴格規則
    '@typescript-eslint/no-explicit-any': 'error',
    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
    '@typescript-eslint/explicit-function-return-type': ['warn', {
      allowExpressions: true,
      allowTypedFunctionExpressions: true,
    }],
    '@typescript-eslint/no-non-null-assertion': 'warn',
    '@typescript-eslint/prefer-nullish-coalescing': 'warn',
    '@typescript-eslint/prefer-optional-chain': 'warn',

    // 最佳實踐
    'no-console': ['error', { allow: ['warn', 'error'] }],
    'no-debugger': 'error',
    'prefer-const': 'error',
    'no-var': 'error',
    'eqeqeq': ['error', 'always'],

    // 複雜度控制
    'complexity': ['warn', { max: 15 }],
    'max-depth': ['warn', { max: 4 }],
    'max-lines-per-function': ['warn', { max: 100, skipBlankLines: true, skipComments: true }],

    // 導入規則
    'import/order': ['warn', {
      'groups': ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
      'newlines-between': 'always',
      'alphabetize': { order: 'asc' }
    }],
  },
  ignorePatterns: [
    'node_modules',
    'dist',
    'build',
    'test-results',
    'playwright-report',
    '*.config.js',
    '.eslintrc.js'
  ],
};