eslint.config.js

/* eslint-disable no-undef, @typescript-eslint/no-require-imports, @typescript-eslint/no-unused-vars */
const eslint = require('@eslint/js');
const importPlugin = require('eslint-plugin-import');
const jest = require('eslint-plugin-jest');
const prettierRecommended = require('eslint-plugin-prettier/recommended');
const sonarjs = require('eslint-plugin-sonarjs');
const tseslint = require('typescript-eslint');

// https://eslint.org/docs/latest/use/configure/configuration-files#typescript-configuration-files
module.exports = (async function config() {
  const { default: stylistic } = await import('@stylistic/eslint-plugin');
  const { default: love } = await import('eslint-config-love');
  const { default: unicorn } = await import('eslint-plugin-unicorn');

  return tseslint.config(
    eslint.configs.recommended,
    tseslint.configs.recommendedTypeChecked,
    tseslint.configs.strictTypeChecked,
    tseslint.configs.stylisticTypeChecked,
    love,
    stylistic.configs.recommended,
    prettierRecommended,
    unicorn.configs.recommended,
    sonarjs.configs.recommended,
    jest.configs['flat/recommended'],
    {
      ignores: ['**/node_modules/**', 'dist/**', 'src/entity/**'],
    },
    {
      languageOptions: {
        parserOptions: {
          // projectService: true,
          projectService: {
            allowDefaultProject: ['*.js'],
          },
          tsconfigRootDir: __dirname,
        },
      },
      plugins: {
        '@typescript-eslint': tseslint.plugin,
        jest,
      },
      // https://github.com/import-js/eslint-plugin-import?tab=readme-ov-file#config---flat-with-config-in-typescript-eslint
      // Config "import/recommended": Key "plugins": Cannot redefine plugin "import".
      // extends: [importPlugin.flatConfigs.recommended, importPlugin.flatConfigs.typescript],
      settings: {
        'import/resolver': {
          typescript: true,
          node: true,
        },
      },
      // These rules are for reference only.
      rules: {
        // #region eslint
        'class-methods-use-this': 'off',
        complexity: ['error', 20],
        // https://github.com/typescript-eslint/typescript-eslint/issues/1277
        'consistent-return': 'off',
        'eslint-comments/require-description': 'off',
        'func-names': 'off',
        'max-len': ['error', { code: 140, ignoreTemplateLiterals: true, ignoreUrls: true }],
        'newline-per-chained-call': 'off',
        'no-await-in-loop': 'off',
        'no-continue': 'off',
        // https://github.com/airbnb/javascript/issues/1342
        'no-param-reassign': ['error', { props: false }],
        // https://github.com/airbnb/javascript/issues/1271
        // https://github.com/airbnb/javascript/blob/fd77bbebb77362ddecfef7aba3bf6abf7bdd81f2/packages/eslint-config-airbnb-base/rules/style.js#L340-L358
        'no-restricted-syntax': ['error', 'ForInStatement', 'LabeledStatement', 'WithStatement'],
        'no-underscore-dangle': ['error', { allow: ['_id'] }],
        'no-void': ['error', { allowAsStatement: true }],
        'object-curly-newline': 'off',
        'spaced-comment': ['error', 'always', { line: { markers: ['/', '#region', '#endregion'] } }],
        // #endregion

        // #region import
        'import/no-default-export': 'error',
        'import/order': [
          'error',
          {
            groups: [
              ['builtin', 'external'],
              ['internal', 'parent', 'sibling', 'index'],
            ],
            'newlines-between': 'always',
            alphabetize: { order: 'asc', caseInsensitive: true },
          },
        ],
        'import/prefer-default-export': 'off',
        // #endregion

        // #region @typescript-eslint
        '@typescript-eslint/class-methods-use-this': 'off',
        '@typescript-eslint/consistent-type-assertions': ['error', { assertionStyle: 'angle-bracket' }],
        '@typescript-eslint/init-declarations': ['error', 'never', { ignoreForLoopInit: true }],
        '@typescript-eslint/naming-convention': [
          'error',
          { selector: 'default', format: ['strictCamelCase'] },
          { selector: 'variable', format: ['strictCamelCase', 'UPPER_CASE', 'StrictPascalCase'] },
          // https://github.com/microsoft/TypeScript/issues/9458
          { selector: 'parameter', modifiers: ['unused'], format: ['strictCamelCase'], leadingUnderscore: 'allow' },
          { selector: 'property', format: null },
          { selector: 'typeProperty', format: null },
          { selector: 'typeLike', format: ['StrictPascalCase'] },
          { selector: 'enumMember', format: ['UPPER_CASE'] },
        ],
        '@typescript-eslint/no-extraneous-class': 'off',
        '@typescript-eslint/no-magic-numbers': 'off',
        '@typescript-eslint/no-unsafe-member-access': 'off',
        '@typescript-eslint/no-unsafe-type-assertion': 'off',
        '@typescript-eslint/restrict-template-expressions': [
          'error',
          { allowAny: true, allowBoolean: true, allowNullish: true, allowNumber: true, allowRegExp: true },
        ],
        '@typescript-eslint/prefer-destructuring': 'off',
        '@typescript-eslint/prefer-readonly': 'off',
        '@typescript-eslint/strict-boolean-expressions': 'off',
        // #endregion

        // #region stylistic
        '@stylistic/arrow-parens': ['error', 'always'],
        '@stylistic/brace-style': ['error', '1tbs'],
        '@stylistic/lines-between-class-members': ['error', 'always', { exceptAfterSingleLine: true }],
        '@stylistic/no-extra-parens': ['error', 'functions'],
        '@stylistic/object-curly-spacing': ['error', 'always'],
        '@stylistic/semi': ['error', 'always'],

        // for prettier
        '@stylistic/indent': 'off',
        '@stylistic/keyword-spacing': 'off',
        '@stylistic/member-delimiter-style': 'off',
        '@stylistic/operator-linebreak': 'off',
        // #endregion

        // #region sonarjs
        'sonarjs/cognitive-complexity': ['error', 25],
        // https://community.sonarsource.com/t/eslint-plugin-sonarjs-performance-issues-on-large-codebase/138392
        'sonarjs/no-commented-code': 'off',
        'sonarjs/no-duplicate-string': 'off',
        'sonarjs/no-nested-assignment': 'off',
        // #endregion

        // #region unicorn
        'unicorn/no-null': 'off',
        'unicorn/prevent-abbreviations': 'off',
        'unicorn/prefer-module': 'off',
        'unicorn/prefer-ternary': ['error', 'only-single-line'],
        'unicorn/prefer-top-level-await': 'off',
        // #endregion
      },
    },
  );
})();