@hono/eslint-config/index.js

ESLint Config for Hono projects

import js from '@eslint/js'
import prettier from 'eslint-config-prettier/flat'
import importX from 'eslint-plugin-import-x'
import nodePlugin from 'eslint-plugin-n'
import tseslint from 'typescript-eslint'

/**
 * @type {import("@eslint/config-helpers").InfiniteConfigArray}
 */
const config = [
  js.configs.recommended,
  nodePlugin.configs['flat/recommended'],
  ...tseslint.configs.strictTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,
  {
    plugins: {
      '@typescript-eslint': tseslint.plugin,
      'import-x': importX,
    },
    languageOptions: {
      globals: {
        fetch: false,
        Response: false,
        Request: false,
        addEventListener: false,
      },

      ecmaVersion: 2021,
      sourceType: 'module',
    },

    rules: {
      'no-debugger': ['error'],

      'no-empty': [
        'warn',
        {
          allowEmptyCatch: true,
        },
      ],

      'no-process-exit': 'off',
      'no-useless-escape': 'off',

      'prefer-const': [
        'warn',
        {
          destructuring: 'all',
        },
      ],

      'import-x/consistent-type-specifier-style': ['error', 'prefer-top-level'],
      'import-x/order': [
        'error',
        {
          groups: ['external', 'builtin', 'internal', 'parent', 'sibling', 'index'],
          alphabetize: {
            order: 'asc',
            caseInsensitive: true,
          },
        },
      ],
      'import-x/no-duplicates': 'error',

      'n/no-missing-import': 'off',
      'n/no-missing-require': 'off',
      'n/no-deprecated-api': 'off',
      'n/no-unpublished-import': 'off',
      'n/no-unpublished-require': 'off',
      'n/no-unsupported-features/es-syntax': 'off',
      'n/no-unsupported-features/node-builtins': 'off',

      '@typescript-eslint/consistent-type-imports': [
        'error',
        {
          prefer: 'type-imports',
        },
      ],
      '@typescript-eslint/no-empty-object-type': 'off',
      '@typescript-eslint/no-unsafe-function-type': 'off',
      '@typescript-eslint/no-empty-function': [
        'error',
        {
          allow: ['arrowFunctions'],
        },
      ],
      '@typescript-eslint/no-unused-expressions': 'off',
      '@typescript-eslint/no-empty-interface': 'off',
      '@typescript-eslint/no-explicit-any': 'warn',
      '@typescript-eslint/no-inferrable-types': 'off',
      '@typescript-eslint/no-require-imports': 'off',
      '@typescript-eslint/no-unused-vars': [
        'warn',
        {
          args: 'all',
          argsIgnorePattern: '^_',
          caughtErrors: 'all',
          caughtErrorsIgnorePattern: '^_',
          destructuredArrayIgnorePattern: '^_',
          varsIgnorePattern: '^_',
          ignoreRestSiblings: true,
        },
      ],
      '@typescript-eslint/no-var-requires': 'off',

      '@typescript-eslint/no-base-to-string': [
        'error',
        {
          ignoredTypeNames: ['Error', 'RegExp', 'URL', 'URLSearchParams'],
        },
      ],

      '@typescript-eslint/restrict-template-expressions': [
        'error',
        {
          allow: [{ name: ['Error', 'URL', 'URLSearchParams'], from: 'lib' }],
          allowAny: true,
          allowBoolean: true,
          allowNullish: true,
          allowNumber: true,
          allowRegExp: true,
        },
      ],
    },
  },
  prettier,
  {
    // Special rules that override eslint-config-prettier
    // See: https://github.com/prettier/eslint-config-prettier#special-rules
    rules: {
      curly: ['error', 'all'],
    },
  },
]

export default config