How to use webpack to build a react development environment

This time I will show you how to use webpack to build a react development environment, and what are the precautions 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

2. Install webpack

npm i webpack -D

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

3. Create a new project structure

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

index.html

nbsp;html>


  <meta>
  <title>Title</title>


<p></p>
<script></script>

index.js

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

Non-global installation of packaging.

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

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')
  }
};

Run command:

node_modules\.bin\webpack --mode production You can package 2.NPM Scripts (NPM Scripts) Add an npm script in package.json (npm script): "build": "webpack --mode production" Run npm run build to 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-server Modify 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
  }
};

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"

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()
  ],

Add the following code in the main js file

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

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
  },

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

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
    })
  ]
};

Run

npm run build for 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. Pass npm i clean-webpack-plugin -D command 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')
  ]
};

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
}

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'
        }
      }
    ]
  }
};

Separation of development environment and production environment

1. Install webpack-merge

npm install --save-dev webpack-merge

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'
        }
      }
    ]
  }
};

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(),
  ],
});

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()
   ]
 });

Configure react

1. Install react,

react-dom npm i react react-dom -S

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

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

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(
  <appcontainer>
    <app></app>
  </appcontainer>,
  document.getElementById('root')
);
if (module.hot) {
  module.hot.accept();
}

4.安装 react-hot-loader

npm i -D react-hot-loader

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

2.安装 sass-loader node-sass

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

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

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

4.配置webpack配置文件

webpack.common.js

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

webpack.dev.js

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

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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