How to use webpack to build a react development environment-JS Tutorial-php.cn

This time I will show you how to use webpack to build a react development environment, and what are theprecautions for using webpack to build a react development environment. The following is a practical case, let's take a look.

1.Initialize the project

mkdir react-redux && cd react-redux npm init -y

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2. Install webpack

npm i webpack -D

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npm i -D It is the abbreviation of npm install --save-dev, which refers to installing modules and saving them in the devDependencies of package.json, mainly dependency packages in the development environment. If you use webpack 4 version, you also need to install the CLI.

npm install -D webpack webpack-cli

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3. Create a new project structure

react-redux |- package.json + |- /dist + |- index.html |- /src |- index.js

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index.html

Title

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index.js

document.querySelector('#root').innerHTML = 'webpack使用';

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Non-global installation of packaging.

node_modules\.bin\webpack src\index.js --output dist\bundle.js --mode development

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Open the html in the dist directory to display webpack and use

to configure webpack

1. Use the

configuration file

const path=require('path'); module.exports={ entry:'./src/index.js', output:{ filename:'bundle.js', path:path.resolve(dirname,'dist') } };

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Run command:

node_modules\.bin\webpack --mode productionYou can package 2.NPM Scripts (NPM Scripts) Add an npm script in package.json (npm script):"build": "webpack --mode production"Runnpm run buildto package

Build using webpack Local server

webpack-dev-server provides a simple web server and can be reloaded in real time.

1. Installation

npm i -D webpack-dev-serverModify the configuration file webpack.config.js

const path=require('path'); module.exports={ entry:'./src/index.js', output:{ filename:'bundle.js', path:path.resolve(dirname,'dist') }, //以下是新增的配置 devServer:{ contentBase: "./dist",//本地服务器所加载的页面所在的目录 historyApiFallback: true,//不跳转 inline: true,//实时刷新 port:3000, open:true,//自动打开浏览器 } };

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Run webpack-dev-server --progress, browse The server opens localhost:3000, and the modified code will display the modified results in real time. Add the scripts script and run npm start to automatically open http://localhost:8080/

"start": "webpack-dev-server --open --mode development"

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After starting webpack-dev-server, in the target file The compiled files cannot be seen in the folder, and the files compiled in real time are saved in the memory. Therefore, when using webpack-dev-server for development, you cannot see the compiled files

2. Hot update

Configure a plug-in that comes with webpack and also include it in the main js file Check if there is module.hot

plugins:[ //热更新,不是刷新 new webpack.HotModuleReplacementPlugin() ],

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Add the following code in the main js file

if (module.hot){ //实现热更新 module.hot.accept(); }

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Enable hot update in webpack.config.js

devServer:{ contentBase: "./dist",//本地服务器所加载的页面所在的目录 historyApiFallback: true,//不跳转 inline: true,//实时刷新 port:3000, open:true,//自动打开浏览器 hot:true //开启热更新 },

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Hot update is allowed to run Update various modules without the need for a complete refresh.

Configure Html template

1. Install the html-webpack-plugin plugin

npm i html-webpack-plugin -D

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2. Reference the plug-in in webpack.config.js

const path=require('path'); let webpack=require('webpack'); let HtmlWebpackPlugin=require('html-webpack-plugin'); module.exports={ entry:'./src/index.js', output:{ //添加hash可以防止文件缓存,每次都会生成4位hash串 filename:'bundle.[hash:4].js', path:path.resolve('dist') }, //以下是新增的配置 devServer:{ contentBase: "./dist",//本地服务器所加载的页面所在的目录 historyApiFallback: true,//不跳转 inline: true,//实时刷新 port:3000, open:true,//自动打开浏览器 hot:true //开启热更新 }, plugins:[ new HtmlWebpackPlugin({ template:'./src/index.html', hash:true, //会在打包好的bundle.js后面加上hash串 }) ] };

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Run

npm run buildfor packaging. At this time, it will be in the dist directory every time npm run build Create a lot of packaged packages. You should clear the files in the dist directory before each package, and then put the packaged files into it. The clean-webpack-plugin plug-in is used here. Passnpm i clean-webpack-plugin -Dcommand to install. Then reference the plug-in in webpack.config.js.

const path=require('path'); let webpack=require('webpack'); let HtmlWebpackPlugin=require('html-webpack-plugin'); let CleanWebpackPlugin=require('clean-webpack-plugin'); module.exports={ entry:'./src/index.js', output:{ //添加hash可以防止文件缓存,每次都会生成4位hash串 filename:'bundle.[hash:4].js', path:path.resolve('dist') }, //以下是新增的配置 devServer:{ contentBase: "./dist",//本地服务器所加载的页面所在的目录 historyApiFallback: true,//不跳转 inline: true,//实时刷新 port:3000, open:true,//自动打开浏览器 hot:true //开启热更新 }, plugins:[ new HtmlWebpackPlugin({ template:'./src/index.html', hash:true, //会在打包好的bundle.js后面加上hash串 }), //打包前先清空 new CleanWebpackPlugin('dist') ] };

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After packaging, no extra files will be generated.

Compile es6 and jsx

1. Install babel

npm i babel-core babel-loader babel-preset-env babel-preset-react babel-preset-stage-0 -D babel-loader : babelLoader babel-preset-env: Only compiles features that are not yet supported according to the configured env. babel-preset-react: Convert jsx to js

2. Add .babelrc configuration file

{ "presets": ["env", "stage-0","react"] //从左向右解析 }

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3. Modify webpack.config.js

const path=require('path'); module.exports={ entry:'./src/index.js', output:{ filename:'bundle.js', path:path.resolve(dirname,'dist') }, //以下是新增的配置 devServer:{ contentBase: "./dist",//本地服务器所加载的页面所在的目录 historyApiFallback: true,//不跳转 inline: true//实时刷新 }, module:{ rules:[ { test:/\.js$/, exclude:/(node_modules)/, //排除掉nod_modules,优化打包速度 use:{ loader:'babel-loader' } } ] } };

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Separation of development environment and production environment

1. Install webpack-merge

npm install --save-dev webpack-merge

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2. Create a new file named webpack.common.js as a public configuration and write The following content:

const path=require('path'); let webpack=require('webpack'); let HtmlWebpackPlugin=require('html-webpack-plugin'); let CleanWebpackPlugin=require('clean-webpack-plugin'); module.exports={ entry:['babel-polyfill','./src/index.js'], output:{ //添加hash可以防止文件缓存,每次都会生成4位hash串 filename:'bundle.[hash:4].js', path:path.resolve(dirname,'dist') }, plugins:[ new HtmlWebpackPlugin({ template:'./src/index.html', hash:true, //会在打包好的bundle.js后面加上hash串 }), //打包前先清空 new CleanWebpackPlugin('dist'), new webpack.HotModuleReplacementPlugin() //查看要修补(patch)的依赖 ], module:{ rules:[ { test:/\.js$/, exclude:/(node_modules)/, //排除掉nod_modules,优化打包速度 use:{ loader:'babel-loader' } } ] } };

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3. Create a new file named webpack.dev.js as the development environment configuration

const merge=require('webpack-merge'); const path=require('path'); let webpack=require('webpack'); const common=require('./webpack.common.js'); module.exports=merge(common,{ devtool:'inline-soure-map', mode:'development', devServer:{ historyApiFallback: true, //在开发单页应用时非常有用，它依赖于HTML5 history API，如果设置为true，所有的跳转将指向index.html contentBase:path.resolve(dirname, '../dist'),//本地服务器所加载的页面所在的目录 inline: true,//实时刷新 open:true, compress: true, port:3000, hot:true //开启热更新 }, plugins:[ //热更新,不是刷新 new webpack.HotModuleReplacementPlugin(), ], });

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4. Create a new file named webpack.prod.js as the production environment configuration

const merge = require('webpack-merge'); const path=require('path'); let webpack=require('webpack'); const UglifyJSPlugin = require('uglifyjs-webpack-plugin'); const common = require('./webpack.common.js'); module.exports = merge(common, { mode:'production', plugins: [ new UglifyJSPlugin() ] });

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Configure react

1. Install react,

react-dom npm i react react-dom -S

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2. Create a new App.js and add the following content.

import React from 'react'; class App extends React.Component{ render(){ return (佳佳加油
); } } export default App;

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3. Add the following content to index.js.

import React from 'react'; import ReactDOM from 'react-dom'; import {AppContainer} from 'react-hot-loader'; import App from './App'; ReactDOM.render(   , document.getElementById('root') ); if (module.hot) { module.hot.accept(); }

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4.安装 react-hot-loader

npm i -D react-hot-loader

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5.修改配置文件在 webpack.config.js 的 entry 值里加上 react-hot-loader/patch，一定要写在entry 的最前面，如果有 babel-polyfill 就写在babel-polyfill 的后面

6.在 .babelrc 里添加 plugin, "plugins": ["react-hot-loader/babel"]

处理SASS

1.安装 style-loader css-loader url-loader

npm install style-loader css-loader url-loader --save-dev

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2.安装 sass-loader node-sass

npm install sass-loader node-sass --save-dev

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3.安装 mini-css-extract-plugin ,提取单独打包css文件

npm install --save-dev mini-css-extract-plugin

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4.配置webpack配置文件

webpack.common.js

{ test:/\.(png|jpg|gif)$/, use:[ "url-loader" ] },

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webpack.dev.js

{ test:/\.scss$/, use:[ "style-loader", "css-loader", "sass-loader" ] }

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webpack.prod.js

const merge = require('webpack-merge'); const path=require('path'); let webpack=require('webpack'); const MiniCssExtractPlugin=require("mini-css-extract-plugin"); const UglifyJSPlugin = require('uglifyjs-webpack-plugin'); const common = require('./webpack.common.js'); module.exports = merge(common, { mode:'production', module:{ rules:[ { test:/\.scss$/, use:[ // fallback to style-loader in development process.env.NODE_ENV !== 'production' ? 'style-loader' : MiniCssExtractPlugin.loader, "css-loader", "sass-loader" ] } ] }, plugins: [ new UglifyJSPlugin(), new MiniCssExtractPlugin({ // Options similar to the same options in webpackOptions.output // both options are optional filename: "[name].css", chunkFilename: "[id].css" }) ] });

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