eslint.config.mjs

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

import { fixupConfigRules, fixupPluginRules } from '@eslint/compat';
import { FlatCompat } from '@eslint/eslintrc';
import js from '@eslint/js';
import typescriptEslint from '@typescript-eslint/eslint-plugin';
import tsParser from '@typescript-eslint/parser';
import vitest from '@vitest/eslint-plugin';
import _import from 'eslint-plugin-import';
import prettier from 'eslint-plugin-prettier';
import simpleImportSort from 'eslint-plugin-simple-import-sort';
import unicorn from 'eslint-plugin-unicorn';
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: ['**/node_modules', '**/dist', '**/coverage', '.releaserc.js'],
  },
  ...fixupConfigRules(
    compat.extends(
      'eslint:recommended',
      'plugin:@typescript-eslint/eslint-recommended',
      'plugin:@typescript-eslint/recommended',
      'plugin:import/recommended',
      'plugin:import/typescript',
      'plugin:unicorn/recommended',
      'prettier',
    ),
  ),
  {
    plugins: {
      '@typescript-eslint': fixupPluginRules(typescriptEslint),
      prettier,
      import: fixupPluginRules(_import),
      'simple-import-sort': simpleImportSort,
      vitest,
      unicorn: fixupPluginRules(unicorn),
    },

    languageOptions: {
      globals: {
        ...globals.node,
      },

      parser: tsParser,
      ecmaVersion: 'latest',
      sourceType: 'module',

      parserOptions: {
        project: ['tsconfig.json'],
      },
    },

    settings: {
      'import/parsers': {
        '@typescript-eslint/parser': ['.ts'],
      },

      'import/resolver': {
        typescript: {
          alwaysTryTypes: true,
        },
      },
    },

    rules: {
      '@typescript-eslint/no-non-null-assertion': 'off',
      'prettier/prettier': 2,
      'import/no-unresolved': 'error',
      'import/first': 'error',
      'import/newline-after-import': 'error',
      'import/no-duplicates': 'error',
      'simple-import-sort/imports': 'error',
      'simple-import-sort/exports': 'error',

      'vitest/max-nested-describe': [
        'error',
        {
          max: 3,
        },
      ],

      'vitest/consistent-test-it': 'error',
      'vitest/no-identical-title': 'error',
      'vitest/prefer-to-be': 'error',
      'vitest/prefer-lowercase-title': 'error',
    },
  },
];