欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

webpack+react+antd脚手架优化的方法

程序员文章站 2023-11-26 11:59:28
在中了解了webpack v4的特性,现在将知识用于实践,对之前写的一个react脚手架进行打包性能的优化。 优化类目 样式分离 第三方资源分离 区...

在中了解了webpack v4的特性,现在将知识用于实践,对之前写的一个react脚手架进行打包性能的优化。

优化类目

  1. 样式分离
  2. 第三方资源分离
  3. 区分开发环境
  4. 热更新
  5. 提取公共代码

1. css分离

npm install extract-text-webpack-plugin -d

webpack.config.js

将css、less、sass文件单独从打包文件中分离

+ let cssextract = new extracttextwebpackplugin({
+ filename: 'css.css',
+ allchunks: true
+ });
+ let sassextract = new extracttextwebpackplugin('sass.css')
+ let lessextract = new extracttextwebpackplugin('less.css')

在webpack.config.js中单独添加规则,

  1. test:匹配处理文件的扩展名的正则表达式
  2. include/exclude手动指定必须处理的文件夹或屏蔽不需要处理的文件夹
{
 test: /\.css$/,
 use: cssextract.extract({
 fallback: "style-loader",
 use: ['css-loader?minimize','postcss-loader'],
 publicpath: "/dist"
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
},
{
 test: /\.scss$/,
 use: sassextract.extract({
 fallback: "style-loader",
 use: ["css-loader?minimize","sass-loader"],
 publicpath: "/dist"
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
},
{
 test: /\.less$/,
 loader: lessextract.extract({
 use: ["css-loader?minimize", "less-loader"]
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
},

然后运行webpack命令时报错

compilation.maintemplate.applypluginswaterfall is not a function

use chunks.groupsiterable and filter by instanceof entrypoint instead

研究得出结论:webpack升级到v4然而响应的插件没有升级的原故。

解决方法:安装指定版本的依赖

"html-webpack-plugin": "^3.0.4"
"extract-text-webpack-plugin": "^4.0.0-beta.0"

resolve

指定extension之后可以不用在require或是import的时候加文件扩展名,会依次尝试添加扩展名进行匹配

resolve: {
 //引入模块的时候,可以不用扩展名
 extensions: [".js", ".less", ".json"],
 alias: {//别名
 "bootstrap": "bootstrap/dist/css/bootstrap.css"
 }
}

监听文件修改

webpack模式下使用,webpack-dev-server模式不用,可以将watch改为false

watchoptions: {
 ignored: /node_modules/,
 aggregatetimeout: 300, //监听到变化发生后等300ms再去执行动作,防止文件更新太快导致编译频率太高
 poll: 1000 //通过不停的询问文件是否改变来判断文件是否发生变化,默认每秒询问1000次
}

提取公共代码

optimization: {
 splitchunks: {
 cachegroups: {
 commons: {
  chunks: "initial",
  minchunks: 2,
  maxinitialrequests: 5, // the default limit is too small to showcase the effect
  minsize: 0 // this is example is too small to create commons chunks
 },
 vendor: {
  test: /node_modules/,
  chunks: "initial",
  name: "vendor",
  priority: 10,
  enforce: true
 }
 }
 }
 }

分离react react-dom ant公共代码

方法一:externals

在页面上引入第三方资源库,然后使用externals防止将某些 import 的包(package)打包到 bundle 中,而是在运行时(runtime)再去从外部获取这些扩展依赖(external dependencies)。

<script src="https://cdn.bootcss.com/react/16.4.0-alpha.0911da3/cjs/react.production.min.js"></script>
<script src="https://cdn.bootcss.com/react-dom/16.4.0-alpha.0911da3/cjs/react-dom-server.browser.production.min.js"></script>
externals: { 'react': 'react', 'react-dom': 'reactdom', // 提出ant design的公共资源, }

方法二:dll

dll在上篇文章中写过,但是打包后一直出现

webpack+react+antd脚手架优化的方法

后来才发现是页面上没有引入资源。。。。(我一直以为会webpack自动生成在页面上....)

在index.html文件中引入

<script src="./vendor/react.dll.js"></script>

分离成功!上代码

webpack.base.js

var path = require('path');
var webpack = require('webpack');
var extracttextwebpackplugin = require("extract-text-webpack-plugin");
const htmlwebpackplugin = require("html-webpack-plugin");
const cleanwebpackplugin = require('clean-webpack-plugin');
const copywebpackplugin = require('copy-webpack-plugin')

let cssextract = new extracttextwebpackplugin({
 filename: 'css.css',
 allchunks: true
});
let sassextract = new extracttextwebpackplugin('sass.css')
let lessextract = new extracttextwebpackplugin('less.css')

module.exports = {
 entry:'./src/index.js',
 output: {
 path: path.resolve(__dirname, './dist'),
 filename: 'bundle.[hash:8].js',
 publicpath: ''
 },
 resolve: {
 //引入模块的时候,可以不用扩展名
 extensions: [".js", ".less", ".json"],
 alias: {//别名
 "bootstrap": "bootstrap/dist/css/bootstrap.css"
 },
 modules: [path.resolve(__dirname, 'node_modules')]
 },
/* externals: {
 'react': 'react',
 'react-dom': 'reactdom',
 // 提出ant design的公共资源
 //'antd': 'antd',
 },*/
 devtool: 'source-map',
 devserver: {
 contentbase:path.resolve(__dirname,'dist'),
 publicpath: '/',
 port: 8080,
 hot:true,
 compress:true,
 historyapifallback: true,
 inline: true
 },
 watch: false, //只有在开启监听模式时,watchoptions才有意义
 watchoptions: {
 ignored: /node_modules/,
 aggregatetimeout: 300, //监听到变化发生后等300ms再去执行动作,防止文件更新太快导致编译频率太高
 poll: 1000 //通过不停的询问文件是否改变来判断文件是否发生变化,默认每秒询问1000次
 },
 optimization: {
 splitchunks: {
 cachegroups: {
 commons: {
  chunks: "initial",
  minchunks: 2,
  maxinitialrequests: 5, // the default limit is too small to showcase the effect
  minsize: 0 // this is example is too small to create commons chunks
 },
 vendor: {
  test: /node_modules/,
  chunks: "initial",
  name: "vendor",
  priority: 10,
  enforce: true
 }
 }
 }
 },
 module: {
 rules:[
 {
 test: /\.js$/,
 use: {
  loader:'babel-loader',
  options: {
  presets: ['env','es2015', 'react'],
  }
 },
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
 },
 {
 test: /\.css$/,
 use: cssextract.extract({
  fallback: "style-loader",
  use: ['css-loader?minimize','postcss-loader'],
  publicpath: "/dist"
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
 },
 {
 test: /\.scss$/,
 use: sassextract.extract({
  fallback: "style-loader",
  use: ["css-loader?minimize","sass-loader"],
  publicpath: "/dist"
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
 },
 {
 test: /\.less$/,
 loader: lessextract.extract({
  use: ["css-loader?minimize", "less-loader"]
 }),
 include:path.join(__dirname,'./src'),
 exclude:/node_modules/
 },
 {
 test: /\.(html|htm)/,
 use: 'html-withimg-loader'
 },
 {
 test: /\.(png|jpg|gif|svg|bmp|eot|woff|woff2|ttf)/,
 use: {
  loader:'url-loader',
  options:{
  limit: 5 * 1024,
  //指定拷贝文件的输出目录
  outputpath: 'images/'
  }
 }
 }
 ]
 },
 plugins: [
 //定义环境变量
 new webpack.defineplugin({
 __development__: json.stringify(process.env.node_env)
 }),
 new cleanwebpackplugin(['dist']),
 cssextract,
 lessextract,
 sassextract,
 new htmlwebpackplugin({
 title: 'react biolerplate by yuanyuan',
 template: './src/index.html',
 filename: `index.html`,
 hash: true
 }),
 new webpack.dllreferenceplugin({
 manifest: path.join(__dirname, 'vendor', 'react.manifest.json')
 }),
 new copywebpackplugin([{
 from: path.join(__dirname,'vendor'),//静态资源目录源地址
 to:'./vendor' //目标地址,相对于output的path目录
 }]),
/* new webpack.optimize.commonschunkplugin({
 name: 'common' // 指定公共 bundle 的名称。
 + })*/
 new webpack.hotmodulereplacementplugin(), // 热替换插件
 new webpack.namedmodulesplugin() // 执行热替换时打印模块名字
 ]
};

webpack.config.js

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');//用来合并配置文件
const base = require('./webpack.base');
let other = '';

//console.log(process.env.node_env )
if (process.env.node_env == 'development') {
 other = require('./webpack.dev.config');
} else {
 other = require('./webpack.prod.config');
}
//console.log(merge(base, other));

module.exports = merge(base, other);
webpack.prod.config.js

const path = require('path');
const webpack = require('webpack');
const uglifyjsplugin = require('uglifyjs-webpack-plugin')

module.exports = {
 output: {
 filename: 'bundle.min.js',
 },
 plugins: [
 new uglifyjsplugin({sourcemap: true})
 ]
}

webpack+react+antd脚手架优化的方法

webpack+react+antd脚手架优化的方法

打包速度优化,打包文件细化,改造成功~

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。