webpack 升级到4之后还没好好的同步一个可实用的webpack架子，接下来用webpack4来搭建一个简单的react的多界面应用，废话不说 直接撸码

创建工程

$ mkdir demo && cd demo
$ npm init -y

目录结构

![工程目录结构][1]

webpack 配置

安装react + babel 依赖

$ npm i -S react@16.3.0 react-dom@16.3.0

$ npm i -D webpack@4.4.1 webpack-cli@2.0.13 webpack-dev-server@3.1.1 webpack-merge@4.1.2 babel-cli@6.26.0 babel-preset-env@1.6.1 babel-preset-react@6.24.1 babel-preset-react-hmre@1.1.1 babel-loader@7.1.4 file-loader@1.1.11 url-loader@1.0.1

webpack.base.conf.js(config -> webpack)

const entry = require("./webpack.entry.conf");
const newEntry = {};
for (let name in entry) {
 newEntry[name] = entry[name][0]
}
let config = {
 entry: newEntry,
 resolve: {
 extensions: [".js", ".json", ".jsx", ".css", ".pcss"],
 }
};
module.exports = config;

webpack.dev.conf.js

const webpack = require('webpack');//引入webpack
const opn = require('opn');//打开浏览器
const merge = require('webpack-merge');//webpack配置文件合并
const path = require("path");
const baseWebpackConfig = require("./webpack.base.conf");//基础配置
const webpackFile = require("./webpack.file.conf");//一些路径配置
const eslintFormatter = require('react-dev-utils/eslintFormatter');

let config = merge(baseWebpackConfig, {
 /*设置开发环境*/
 mode: 'development',
 output: {
 path: path.resolve(webpackFile.devDirectory),
 filename: 'js/[name].js',
 chunkFilename: "js/[name].js",
 publicPath: ''
 },
 optimization: {
 runtimeChunk: {
 name: 'manifest'
 },
 // 包拆分
 splitChunks: {
 cacheGroups: {
 common: { // 项目的公共组件
 chunks: "initial",
 name: "common",
 minChunks: 2,
 maxInitialRequests: 5,
 minSize: 0
 },
 vendor: { // 第三方组件
 test: /node_modules/,
 chunks: "initial",
 name: "vendor",
 priority: 10,
 enforce: true
 }
 }
 }
 },
 plugins: [
 /*设置热更新*/
 new webpack.HotModuleReplacementPlugin(),
 ],
 module: {
 rules: [
 {
 test: /\.(js|jsx)$/,
 use: [
 'babel-loader',
 'cache-loader',
 ],
 include: [
 path.resolve(__dirname, "../../app"),
 path.resolve(__dirname, "../../entryBuild")
 ],
 exclude: [
 path.resolve(__dirname, "../../node_modules")
 ],
 },
 {
 test: /\.(css|pcss)$/,
 loader: 'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
 exclude: /node_modules/
 },
 {
 test: /\.(png|jpg|gif|ttf|eot|woff|woff2|svg|swf)$/,
 loader: 'file-loader?name=[name].[ext]&outputPath=' + webpackFile.resource + '/'
 },
 {
 test: /\.(js|jsx)$/,
 enforce: 'pre',
 use: [
 {
 options: {
 formatter: eslintFormatter,
 eslintPath: require.resolve('eslint'),
 // @remove-on-eject-begin
 baseConfig: {
 extends: [require.resolve('eslint-config-react-app')],
 },
 //ignore: false,
 useEslintrc: false,
 // @remove-on-eject-end
 },
 loader: require.resolve('eslint-loader'),
 },
 ],
 include: [
 path.resolve(__dirname, "../../app")
 ],
 exclude: [
 path.resolve(__dirname, "../../node_modules")
 ],
 }
 ]
 },
 /*设置api转发*/
 devServer: {
 host: '0.0.0.0',
 port: 8080,
 hot: true,
 inline: true,
 contentBase: path.resolve(webpackFile.devDirectory),
 historyApiFallback: true,
 disableHostCheck: true,
 proxy: [
 {
 context: ['/api/**', '/u/**'],
 target: 'http://10.8.200.69:8080/',
 secure: false
 }
 ],
 /*打开浏览器 并打开本项目网址*/
 after() {
 opn('http://localhost:' + this.port);
 }
 }
});
module.exports = config;

webpack.prod.conf.js

const path = require('path');
const merge = require('webpack-merge');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const baseWebpackConfig = require("./webpack.base.conf");
const webpackFile = require('./webpack.file.conf');
const entry = require("./webpack.entry.conf");
const webpackCom = require("./webpack.com.conf");

let config = merge(baseWebpackConfig, {
 /*设置生产环境*/
 mode: 'production',
 output: {
 path: path.resolve(webpackFile.proDirectory),
 filename: 'js/[name].[chunkhash:8].js',
 chunkFilename: "js/[name]-[id].[chunkhash:8].js",
 },
 optimization: {
 //包清单
 runtimeChunk: {
 name: "manifest"
 },
 //拆分公共包
 splitChunks: {
 cacheGroups: {
 common: { //项目公共组件
 chunks: "initial",
 name: "common",
 minChunks: 2,
 maxInitialRequests: 5,
 minSize: 0
 },
 vendor: { //第三方组件
 test: /node_modules/,
 chunks: "initial",
 name: "vendor",
 priority: 10,
 enforce: true
 }
 }
 }
 },
 plugins: [
 // extract css into its own file
 new ExtractTextPlugin('css/[name].[md5:contenthash:hex:8].css'),
 // Compress extracted CSS. We are using this plugin so that possible
 // duplicated CSS from different components can be deduped.
 new OptimizeCSSPlugin({
 assetNameRegExp: /\.css$/g,
 cssProcessor: require('cssnano'),
 cssProcessorOptions: {
 discardComments: {removeAll: true},
 // 避免 cssnano 重新计算 z-index
 safe: true
 },
 canPrint: true
 }),
 ],
 module: {
 rules: [
 {
 test: /\.(js|jsx)$/,
 use: [
 'babel-loader',
 ],
 },
 {
 test: /\.(js|jsx)$/,
 loader: 'babel-loader',
 exclude: /node_modules/,
 },
 {
 test: /\.(css|pcss)$/,
 use: ExtractTextPlugin.extract({
 fallback: "style-loader",
 use: "css-loader!postcss-loader"
 })
 },
 {
 test: /\.(png|jpg|gif|ttf|eot|woff|woff2|svg)$/,
 loader: 'url-loader?limit=8192&name=[name].[hash:8].[ext]&publicPath=' + webpackFile.resourcePrefix + '&outputPath=' + webpackFile.resource + '/'
 },
 {
 test: /\.swf$/,
 loader: 'file?name=js/[name].[ext]'
 }
 ]
 }
});
let pages = entry;
for (let chunkName in pages) {
 let conf = {
 filename: chunkName + '.html',
 template: 'index.html',
 inject: true,
 title: webpackCom.titleFun(chunkName,pages[chunkName][1]),
 minify: {
 removeComments: true,
 collapseWhitespace: true,
 removeAttributeQuotes: true
 },
 chunks: ['manifest', 'vendor', 'common', chunkName],
 hash: false,
 chunksSortMode: 'dependency'
 };
 config.plugins.push(new HtmlWebpackPlugin(conf));
}
/* 清除 dist */
config.plugins.push(new CleanWebpackPlugin([webpackFile.proDirectory], {root: path.resolve(__dirname, '../../'), verbose: true, dry: false}));


/* 拷贝静态资源 */
copyArr.map(function (data) {
 return config.plugins.push(data)
});


module.exports = config;

构建多界面

整体架构搭建起来之后
app -> component 

$ mkdir demo && cd demo

$ touch Index.jsx

 import React from 'react';

 class Index extends React.Component {
 render() {
 return (
 <p className="demo">
 写个demo
 </p>
 );
 }
 }
 
 export default Index;

在config -> entry

module.exports = [
 {
 name: 'index',
 path: 'index/Index.jsx',
 title: '首页',
 keywords: '首页',
 description: '首页'
 },
 {
 name: 'demo',
 path: 'demo/Index.jsx',
 title: 'demo',
 keywords: 'demo',
 description: 'demo'
 },
 {
 name: 'demo1',
 path: 'demo1/Index.jsx',
 title: 'demo1',
 keywords: 'demo1',
 description: 'demo1'
 }
];

然后直接执行 npm run create-dev 就会在devBuild 和 entryBuild 中添加一个新的demo.html 和 demo.js

package.json

{
 "name": "webpack_es6",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "scripts": {
 "dev": "webpack-dev-server --devtool eval --progress --colors --profile --config config/webpack/webpack.dev.conf.js",
 "entry": "node config/entry/entryBuild.js",
 "devBuildHtml": "node config/webpack/webpack.devBuildHtml.conf.js",
 "create-dev": "npm run entry && npm run devBuildHtml",
 "build": "BABEL_ENV=production && webpack --progress --colors --config config/webpack/webpack.prod.conf.js",
 "test": "echo \"Error: no test specified\" && exit 1"
 },
 "keywords": [],
 "author": "",
 "license": "ISC",
 "dependencies": {
 "react": "^16.3.0",
 "react-dom": "^16.3.0"
 },
 "devDependencies": {
 "babel-cli": "^6.26.0",
 "babel-eslint": "^8.2.2",
 "babel-loader": "^7.1.4",
 "babel-preset-env": "^1.6.1",
 "babel-preset-react": "^6.24.1",
 "babel-preset-react-hmre": "^1.1.1",
 "cache-loader": "^1.2.2",
 "clean-webpack-plugin": "^0.1.19",
 "copy-webpack-plugin": "^4.5.1",
 "css-loader": "^0.28.11",
 "eslint": "^4.19.1",
 "eslint-config-react-app": "^2.1.0",
 "eslint-loader": "^2.0.0",
 "eslint-plugin-flowtype": "^2.46.1",
 "eslint-plugin-import": "^2.10.0",
 "eslint-plugin-jsx-a11y": "^5.1.1",
 "eslint-plugin-react": "^7.7.0",
 "extract-text-webpack-plugin": "^4.0.0-beta.0",
 "file": "^0.2.2",
 "file-loader": "^1.1.11",
 "html-webpack-plugin": "^3.1.0",
 "optimize-css-assets-webpack-plugin": "^4.0.0",
 "postcss-cssnext": "^3.1.0",
 "postcss-loader": "^2.1.3",
 "precss": "^3.1.2",
 "react-dev-utils": "^5.0.0",
 "style-loader": "^0.20.3",
 "url-loader": "^1.0.1",
 "webpack": "^4.4.1",
 "webpack-cli": "^2.0.13",
 "webpack-dev-server": "^3.1.1",
 "webpack-merge": "^4.1.2"
 },
 "eslintConfig": {
 "extends": "react-app",
 "rules": {
 "import/no-webpack-loader-syntax": 0,
 "no-script-url": 0,
 "jsx-a11y/href-no-hash": 2
 }
 }
}

开发环境小技巧

在开发环境添加cache-loader 可以提升在开发环境的编译速度

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