eslint.config.js

import path from 'node:path';
import { fileURLToPath } from 'node:url';

import { FlatCompat } from '@eslint/eslintrc';
import js from '@eslint/js';
import stylistic from '@stylistic/eslint-plugin';
import typescriptEslintEslintPlugin from '@typescript-eslint/eslint-plugin';
import tsParser from '@typescript-eslint/parser';
import simpleImportSort from 'eslint-plugin-simple-import-sort';
import globals from 'globals';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const compat = new FlatCompat({
  baseDirectory: __dirname,
  recommendedConfig: js.configs.recommended,
  allConfig: js.configs.all,
});

export default [
  {
    ignores: ['dist'],
  },
  ...compat.extends(
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
  ),
  {
    plugins: {
      '@typescript-eslint': typescriptEslintEslintPlugin,
      '@stylistic': stylistic,
      'simple-import-sort': simpleImportSort,
    },
    languageOptions: {
      globals: {
        ...globals.node,
        ...globals.jest,
      },
      parser: tsParser,
      ecmaVersion: 2022,
      sourceType: 'module',
    },
    rules: {
      // https://eslint.org/docs/latest/rules
      quotes: ['warn', 'single'],
      indent: [
        'warn',
        2,
        {
          SwitchCase: 1,
        },
      ],
      'linebreak-style': ['warn', 'unix'],
      'comma-dangle': ['warn', 'always-multiline'],
      'dot-notation': ['warn'],
      eqeqeq: ['warn', 'smart'],
      curly: ['warn', 'all'],
      'brace-style': ['warn'],
      'prefer-arrow-callback': ['warn'],
      'max-len': ['warn', 140],
      'no-console': ['warn'],
      // https://typescript-eslint.io/rules/
      'no-use-before-define': 'off',
      '@typescript-eslint/no-use-before-define': ['warn'],
      '@typescript-eslint/explicit-function-return-type': 'off',
      '@typescript-eslint/no-non-null-assertion': 'off',
      '@typescript-eslint/explicit-module-boundary-types': 'off',
      '@typescript-eslint/no-unused-vars': [
        'warn',
        {
          argsIgnorePattern: '^_',
        },
      ],
      // https://eslint.style/rules
      '@stylistic/semi': ['warn'],
      '@stylistic/member-delimiter-style': ['warn'],
      '@stylistic/comma-spacing': ['warn'],
      '@stylistic/no-multi-spaces': [
        'warn',
        {
          ignoreEOLComments: true,
        },
      ],
      '@stylistic/no-multiple-empty-lines': ['warn', { max: 1 }],
      '@stylistic/no-trailing-spaces': ['warn'],
      '@stylistic/object-curly-spacing': ['warn', 'always'],
      '@stylistic/lines-between-class-members': [
        'warn',
        'always',
        {
          exceptAfterSingleLine: true,
        },
      ],
      '@stylistic/eol-last': ['warn', 'always'],
      // https://github.com/lydell/eslint-plugin-simple-import-sort
      'simple-import-sort/imports': 'error',
      'simple-import-sort/exports': 'error',
    },
  },
];