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Extract Babel configuration to babel-preset-react-app (#701)
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‎packages/babel-preset-react-app/README.md

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# babel-preset-react-app
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This package includes the Babel preset used by [Create React App](https://github.com/facebookincubator/create-react-app).
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## Usage in Create React App Projects
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The easiest way to use this configuration is with [Create React App](https://github.com/facebookincubator/create-react-app), which includes it by default. **You don’t need to install it separately in Create React App projects.**
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## Usage Outside of Create React App
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If you want to use this ESLint configuration in a project not built with Create React App, you can install it with following steps.
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First, [install Babel](https://babeljs.io/docs/setup/).
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Then create a file named `.babelrc` with following contents in the root folder of your project:
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```js
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{
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"presets": ["react-app"]
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}
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```

‎packages/babel-preset-react-app/index.js

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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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var path = require('path');
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module.exports = {
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presets: [
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// Latest stable ECMAScript features
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require.resolve('babel-preset-latest'),
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// JSX, Flow
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require.resolve('babel-preset-react')
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],
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plugins: [
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// class { handleClick = () => { } }
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require.resolve('babel-plugin-transform-class-properties'),
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// { ...todo, completed: true }
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require.resolve('babel-plugin-transform-object-rest-spread'),
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// function* () { yield 42; yield 43; }
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[require.resolve('babel-plugin-transform-regenerator'), {
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// Async functions are converted to generators by babel-preset-latest
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async: false
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}],
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// Polyfills the runtime needed for async/await and generators
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[require.resolve('babel-plugin-transform-runtime'), {
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helpers: false,
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polyfill: false,
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regenerator: true,
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// Resolve the Babel runtime relative to the config.
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moduleName: path.dirname(require.resolve('babel-runtime/package'))
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}]
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],
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env: {
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production: {
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plugins: [
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// Optimization: hoist JSX that never changes out of render()
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// Disabled because of issues:
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// * https://github.com/facebookincubator/create-react-app/issues/525
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// * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/
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// * https://github.com/babel/babel/issues/4516
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// TODO: Enable again when these issues are resolved.
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// require.resolve('babel-plugin-transform-react-constant-elements')
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]
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}
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}
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};

‎packages/babel-preset-react-app/package.json

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{
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"name": "babel-preset-react-app",
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"version": "0.0.1",
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"description": "Babel preset used by Create React App",
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"repository": "facebookincubator/create-react-app",
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"license": "BSD-3-Clause",
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"bugs": {
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"url": "https://github.com/facebookincubator/create-react-app/issues"
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},
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"files": [
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"index.js"
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],
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"dependencies": {
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"babel-plugin-transform-class-properties": "6.11.5",
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"babel-plugin-transform-object-rest-spread": "6.8.0",
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"babel-plugin-transform-react-constant-elements": "6.9.1",
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"babel-plugin-transform-regenerator": "6.14.0",
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"babel-plugin-transform-runtime": "6.15.0",
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"babel-preset-latest": "6.14.0",
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"babel-preset-react": "6.11.1",
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"babel-runtime": "6.11.6"
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}
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}

‎packages/react-scripts/config/babel.dev.js

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*/
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// @remove-on-eject-end
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var path = require('path');
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var findCacheDir = require('find-cache-dir');
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module.exports = {
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name: 'react-scripts'
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}),
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presets: [
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// Latest stable ECMAScript features
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require.resolve('babel-preset-latest'),
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// JSX, Flow
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require.resolve('babel-preset-react')
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],
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plugins: [
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// class { handleClick = () => { } }
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require.resolve('babel-plugin-transform-class-properties'),
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// { ...todo, completed: true }
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require.resolve('babel-plugin-transform-object-rest-spread'),
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// function* () { yield 42; yield 43; }
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[require.resolve('babel-plugin-transform-regenerator'), {
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// Async functions are converted to generators by babel-preset-latest
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async: false
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}],
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// Polyfills the runtime needed for async/await and generators
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[require.resolve('babel-plugin-transform-runtime'), {
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helpers: false,
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polyfill: false,
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regenerator: true,
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// Resolve the Babel runtime relative to the config.
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// You can safely remove this after ejecting:
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moduleName: path.dirname(require.resolve('babel-runtime/package'))
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}]
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require.resolve('babel-preset-react-app')
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]
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};

‎packages/react-scripts/config/babel.prod.js

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*/
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// @remove-on-eject-end
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var path = require('path');
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module.exports = {
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// Don't try to find .babelrc because we want to force this configuration.
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babelrc: false,
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presets: [
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// Latest stable ECMAScript features
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require.resolve('babel-preset-latest'),
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// JSX, Flow
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require.resolve('babel-preset-react')
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],
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plugins: [
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// class { handleClick = () => { } }
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require.resolve('babel-plugin-transform-class-properties'),
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// { ...todo, completed: true }
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require.resolve('babel-plugin-transform-object-rest-spread'),
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// function* () { yield 42; yield 43; }
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[require.resolve('babel-plugin-transform-regenerator'), {
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// Async functions are converted to generators by babel-preset-latest
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async: false
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}],
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// Polyfills the runtime needed for async/await and generators
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[require.resolve('babel-plugin-transform-runtime'), {
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helpers: false,
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polyfill: false,
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regenerator: true,
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// Resolve the Babel runtime relative to the config.
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// You can safely remove this after ejecting:
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moduleName: path.dirname(require.resolve('babel-runtime/package'))
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}],
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// Optimization: hoist JSX that never changes out of render()
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// Disabled because of issues:
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// * https://github.com/facebookincubator/create-react-app/issues/525
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// * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/
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// TODO: Enable again when these issues are resolved.
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// require.resolve('babel-plugin-transform-react-constant-elements')
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require.resolve('babel-preset-react-app')
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]
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};

‎packages/react-scripts/package.json

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"babel-eslint": "6.1.2",
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"babel-jest": "15.0.0",
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"babel-loader": "6.2.5",
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"babel-plugin-transform-class-properties": "6.11.5",
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"babel-plugin-transform-object-rest-spread": "6.8.0",
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"babel-plugin-transform-react-constant-elements": "6.9.1",
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"babel-plugin-transform-regenerator": "6.14.0",
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"babel-plugin-transform-runtime": "6.15.0",
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"babel-preset-latest": "6.14.0",
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"babel-preset-react": "6.11.1",
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"babel-runtime": "6.11.6",
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"babel-preset-react-app": "0.0.1",
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"case-sensitive-paths-webpack-plugin": "1.1.4",
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"chalk": "1.1.3",
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"connect-history-api-fallback": "1.3.0",

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