eslint-config-babel

9.0.0 verified Sat Apr 25 auth: no javascript maintenance

ESLint configuration preset for Babel's own codebase. Version 9.0.0 last updated 2021. Not actively maintained; the Babel team now uses @babel/eslint-plugin. This config enforces strict formatting and is primarily intended for internal Babel projects, not general use. Requires babel-eslint and eslint-plugin-flowtype as peer dependencies. Replaced by @babel/eslint-config in Babel 7.12+.

Common errors

error Error: Failed to load plugin 'flowtype' declared in 'node_modules/eslint-config-babel/index.js': Cannot find module 'eslint-plugin-flowtype' ↓

cause Missing required peer dependency eslint-plugin-flowtype.

fix

npm install --save-dev eslint-plugin-flowtype@^3.0.0

error Error: Cannot find module 'babel-eslint' ↓

cause Missing required peer dependency babel-eslint.

fix

npm install --save-dev babel-eslint@^10.0.0

error Warning: eslint-config-babel is deprecated. Use @babel/eslint-config instead. ↓

cause Package is no longer maintained.

fix

Migrate to @babel/eslint-config as recommended.

Warnings

deprecated eslint-config-babel is no longer actively maintained; use @babel/eslint-config instead. ↓

fix Switch to @babel/eslint-config and uninstall eslint-config-babel.

breaking Version 9.0.0 requires babel-eslint ^10.0.0 || ^11.0.0-0 – version 12+ incompatible. ↓

fix Downgrade babel-eslint to v10 or v11, or migrate to @babel/eslint-parser.

gotcha The config expects eslint-plugin-flowtype v3; install it as a devDependency. ↓

fix Run: npm install --save-dev eslint-plugin-flowtype@^3.0.0

Install

npm install eslint-config-babel

yarn add eslint-config-babel

pnpm add eslint-config-babel

Imports

default config
wrong
```
module.exports = { extends: ['eslint-config-babel'] }
```
correct
```
module.exports = { extends: ['babel'] }
```
When using extends in .eslintrc, you can omit the 'eslint-config-' prefix.

babel (ESM)

wrong

import { babel } from 'eslint-config-babel'

correct

import babel from 'eslint-config-babel'; export default { extends: ['babel'] }

This package does not export a named member; it's a default export object.

require (CommonJS)

wrong

const { babel } = require('eslint-config-babel')

correct

const babel = require('eslint-config-babel'); module.exports = { extends: ['babel'] }

CommonJS usage requires default import.

Quickstart

Basic ESLint configuration using eslint-config-babel for a Node.js project with Flowtype support.

// .eslintrc.js
module.exports = {
  extends: ['babel'],
  parserOptions: {
    ecmaFeatures: { jsx: true },
  },
  env: {
    es6: true,
    node: true,
  },
  plugins: ['flowtype'],
  rules: {
    'flowtype/define-flow-type': 'warn',
  },
};