react 不eject扩展webpack

使用 create-react-app 生成项目，不会有 webpack 的配置项，要导出 webpack ，必须使用 react-script eject ，但这是一个单向操作， eject 后，就无法恢复了。如果只是修改一些简单的配置， eject 是没有必要的。

1、使用 react-app-rewired 包替换 react-script

react-app-rewired@^2.0.0+ 版本需要搭配 customize-cra 使用

# https://www.npmjs.com/package/react-app-rewired
# https://www.npmjs.com/package/customize-cra

$ npm i react-app-rewired -D
$ npm i customize-cra -D
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2、在项目根目录创建 config-overrides.js

3、使用 react-app-rewired 配置 alias

# ./config-overrides.js

const { override, addWebpackAlias } = require('customize-cra')
const path = require('path')
const resolve = dir => path.join(__dirname, '.', dir)

module.exports = override(
  addWebpackAlias({
    ['@']: resolve('src')
  })
)
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4、添加 react-hot-reloader

# https://www.npmjs.com/package/react-hot-loader
# https://github.com/cdharris/react-app-rewire-hot-loader

$ npm i react-hot-loader -D

$ npm i react-app-rewire-hot-loader -D
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5、修改 config-overrides.js

# https://github.com/arackaf/customize-cra/issues/54
# ./config-overrides.js

const { override, addWebpackAlias } = require('customize-cra')
const path = require('path')
const resolve = dir => path.join(__dirname, '.', dir)

module.exports = override(
  addWebpackAlias({
    ['@']: resolve('src')
  }),
  (config, env) => {
    config = rewireReactHotLoader(config, env)
    return config
  }
)
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6、在根组件处开启 react-hot-reloader

# ./App.jsx

import { hot } from 'react-hot-loader/root'

...
...
...

export default process.env.NODE_ENV === 'development' ? hot(App) : App;
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7、引入 antd 按需加载

+ const { override, fixBabelImports, addWebpackAlias } = require('customize-cra')
const rewireReactHotLoader = require('react-app-rewire-hot-loader')
const path = require('path')

const resolve = dir => path.join(__dirname, '.', dir)

module.exports = override(
 + fixBabelImports('import', {
 +   libraryName: 'antd',
 +   libraryDirectory: 'es',
 +   style: 'css'
 + }),
  addWebpackAlias({
    ['@']: resolve('src')
  }),
  (config, env) => {
    config = rewireReactHotLoader(config, env)
    return config
  }
)
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