早些时候CRA(create-react-app)升级到2.0.3的时候, react-app-rewired没有跟着升级, 导致项目无法启动, 于是乎直接eject 开始改造项目.

查看版本

> create-react-app --version
2.0.3

创建项目

create-react-app my-project
cd my-project
yarn eject # 输入 y

目前为止项目目录结构, 忽略node_modules这个黑洞

├── README.md
├── config
│   ├── env.js
│   ├── jest
│   │   ├── cssTransform.js
│   │   └── fileTransform.js
│   ├── paths.js
│   ├── webpack.config.js
│   └── webpackDevServer.config.js
├── package.json
├── public
│   ├── favicon.ico
│   ├── index.html
│   └── manifest.json
├── scripts
│   ├── build.js
│   ├── start.js
│   └── test.js
├── src
│   ├── App.css
│   ├── App.js
│   ├── App.test.js
│   ├── index.css
│   ├── index.js
│   ├── logo.svg
│   └── serviceWorker.js
└── yarn.lock

安装依赖

yarn add antd
yarn add babel-plugin-import less less-loader @babel/plugin-proposal-decorators -D

CRA eject之后package.json里面没有区分devDependencies 和 dependencies, 但是不影响使用

因为antd是使用的less, CRA默认不支持, 所以需要改下默认的webpack配置, config/webpack.config.js

首先修改babel配置

个人习惯使用babelrc, 所以把babel-loader options中babelrc的值改为true, 增加.babelrc文件

{"presets": ["react-app"],"plugins": [["import",{"libraryName": "antd","libraryDirectory": "lib","style": true},"ant"],["@babel/plugin-proposal-decorators", // 启用装饰器{"legacy": true}]]
}

参照默认的sass配置, 增加less配置

const sassRegex = /\.(scss|sass)$/;
const sassModuleRegex = /\.module\.(scss|sass)$/;const lessRegex = /\.less$/;
const lessModuleRegex = /\.module\.less$/;

在module>rules中添加规则

// sass rule
//...{test: lessRegex,exclude: lessModuleRegex,use: getStyleLoaders({importLoaders: 2,sourceMap: isEnvProduction && shouldUseSourceMap},'less-loader',{javascriptEnabled: true}),sideEffects: true},{test: lessModuleRegex,use: getStyleLoaders({importLoaders: 2,sourceMap: isEnvProduction && shouldUseSourceMap,modules: true,getLocalIdent: getCSSModuleLocalIdent},'less-loader',{javascriptEnabled: true})}
// file loader

至此基本项目虽然已经基本完成, 但是如果你是使用less版本比较高, 项目是无法运行的
参考issue
需要改造getStyleLoaders函数, 增加第三个参数otherConfig, 就是上面代码中的 javascriptEnabled: true

const getStyleLoaders = (cssOptions, preProcessor, otherConfig) => {const loaders = [isEnvDevelopment && require.resolve('style-loader'),isEnvProduction && {loader: MiniCssExtractPlugin.loader,options: Object.assign({}, shouldUseRelativeAssetPaths ? { publicPath: '../../' } : undefined)},{loader: require.resolve('css-loader'),options: cssOptions},{loader: require.resolve('postcss-loader'),options: {ident: 'postcss',plugins: () => [require('postcss-flexbugs-fixes'),require('postcss-preset-env')({autoprefixer: {flexbox: 'no-2009'},stage: 3})],sourceMap: isEnvProduction && shouldUseSourceMap}}].filter(Boolean);if (preProcessor) {loaders.push({loader: require.resolve(preProcessor),options: {sourceMap: isEnvProduction && shouldUseSourceMap,...otherConfig}});}return loaders;};

这样修改之后, 自定义主题modifyVars也可以写在otherConfig中, 一举两得, 不多赘述.

至此项目?

优化完善, 启用dll

关于dll的利弊不再赘述, 这里只是说明我用的方法, 也不详细展开, 每个人的项目可能都不一样

安装插件

yarn add clean-webpack-plugin webpack-cli add-asset-html-webpack-plugin -D

在config/paths.js exports对象中增加一行kv

 appDll: resolveApp("dll"),

增加config/webpack.dll.conf.js文件

const paths = require('./paths');
const path = require('path');
const webpack = require('webpack');
const CleanWebpackPlugin = require('clean-webpack-plugin');const vendors = ['react','react-dom'
];module.exports = {mode: 'production',performance: {hints: false},output: {path: paths.appDll,publicPath: paths.servedPath,filename: '[name].[hash].dll.js',library: '[name]_[hash]'},entry: {vendor: vendors},plugins: [new CleanWebpackPlugin([paths.appDll], {root: paths.appPath, // 根目录verbose: true, // 开启在控制台输出信息dry: false // 启用删除文件}),new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),new webpack.DllPlugin({path: path.join(paths.appDll, '[name]-manifest.json'),name: '[name]_[hash]'})]
};

package.json增加dll 脚本

 "dll": "webpack --progress --config config/webpack.dll.conf.js"

运行 yarn dll打包vendor在dll文件夹中

生产模式使用dll, 修改webpack.conf.js, 增加assets插件和dllreference插件

...
const AddAssetHtmlPlugin = require("add-asset-html-webpack-plugin");
....plugins: {......isEnvProduction &&new webpack.DllReferencePlugin({manifest: require('../dll/vendor-manifest.json')}),isEnvProduction &&new AddAssetHtmlPlugin({filepath: path.resolve(paths.appDll, '*.js'),includeSourcemap: false}),}

至此结束, 验证效果

yarn build

build 文件夹结构

├── asset-manifest.json
├── favicon.ico
├── index.html
├── manifest.json
├── precache-manifest.8175e98134227f2327b88338d3024239.js
├── service-worker.js
├── static
│   ├── css
│   │   ├── 1.83e366fa.chunk.css
│   │   ├── 1.83e366fa.chunk.css.map
│   │   ├── main.c7ff46e9.chunk.css
│   │   └── main.c7ff46e9.chunk.css.map
│   ├── js
│   │   ├── 1.860809fa.chunk.js
│   │   ├── 1.860809fa.chunk.js.map
│   │   ├── main.0df678d7.chunk.js
│   │   ├── main.0df678d7.chunk.js.map
│   │   ├── runtime~main.229c360f.js
│   │   └── runtime~main.229c360f.js.map
│   └── media
│       └── logo.5d5d9eef.svg
└── vendor.52ec4f1c0bead1c1a489.dll.js

本地运行serve -s build, 项目能正常显示, build文件夹下有vendor.hash.dll.js则说明配置成.