@the-ruby-group/rgts/eslint.config.gts.js

Custom TypeScript configurations extending Google's `gts` for ESLint, Prettier, and TypeScript, packaged for easy reuse across projects.

const eslint = require('@eslint/js');
const nodePlugin = require('eslint-plugin-n');
const eslintConfigPrettier = require('eslint-config-prettier');
const eslintPluginPrettier = require('eslint-plugin-prettier');
const tsEslint = require('typescript-eslint');
const typescriptParser = require('@typescript-eslint/parser');

module.exports = [
  eslint.configs.recommended,
  nodePlugin.configs['flat/recommended'],
  eslintConfigPrettier,
  {
    plugins: {
      n: nodePlugin,
      prettier: eslintPluginPrettier,
    },
    rules: {
      'prettier/prettier': 'error',
      'block-scoped-var': 'error',
      eqeqeq: 'error',
      'no-var': 'error',
      'prefer-const': 'error',
      'eol-last': 'error',
      'prefer-arrow-callback': 'error',
      'no-trailing-spaces': 'error',
      quotes: ['warn', 'single', { avoidEscape: true }],
      'no-restricted-properties': [
        'error',
        {
          object: 'describe',
          property: 'only',
        },
        {
          object: 'it',
          property: 'only',
        },
      ],
    },
  },
  ...tsEslint.configs.recommended.map(config => ({
    ...config,
    files: ['**/*.ts', '**/*.tsx'],
  })),
  {
    files: ['**/*.ts', '**/*.tsx'],
    languageOptions: {
      parser: typescriptParser,
      parserOptions: {
        ecmaVersion: 2018,
        sourceType: 'module',
      },
    },
    rules: {
      '@typescript-eslint/ban-ts-comment': 'warn',
      '@typescript-eslint/no-non-null-assertion': 'off',
      '@typescript-eslint/no-use-before-define': 'off',
      '@typescript-eslint/no-warning-comments': 'off',
      '@typescript-eslint/no-empty-function': 'off',
      '@typescript-eslint/no-var-requires': 'off',
      '@typescript-eslint/explicit-function-return-type': 'off',
      '@typescript-eslint/explicit-module-boundary-types': 'off',
      '@typescript-eslint/ban-types': 'off',
      '@typescript-eslint/camelcase': 'off',
      'n/no-missing-import': 'off',
      'n/no-empty-function': 'off',
      'n/no-unsupported-features/es-syntax': 'off',
      'n/no-missing-require': 'off',
      'n/shebang': 'off',
      'n/no-unpublished-import': [
        'error',
        {
          convertPath: [
            {
              include: ['src/**'],
              replace: ['^src/(.+)$', 'build/$1'],
            },
          ],
        },
      ],
      'no-dupe-class-members': 'off',
      'require-atomic-updates': 'off',
    },
  },
  {
    ignores: ['build/', 'test/fixtures/', 'template/'],
  },
];