React 使用webpack打包

一、项目创建

1、新建一个项目文件夹，打开终端，切换到到项目目录下：

npm init -y

这时候使用webstorm等高级的编辑器打开项目执行下面步骤效果会更直观。

2、新建一个文件夹public，在文件夹内创建index.html文件，添加：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><div id="root"></div>
</body>
</html>

3、新建一个文件src/index.js，暂时先不写内容。

二、打包依赖配置

1、添加webpack

yarn add webpack webpack-cli --dev

webpack：打包依赖
webpack-cli：打包命令的协议

2、配置babel

yarn add babel-loader @babel/core @babel/preset-env --dev

babel-loader、@babel/core、@babel/preset-env：babel-loader的核心支持库

三、打包配置文件

1、在项目的根目录下新建webpack.config.js文件夹，配置打包模块。

const path = require('path');module.exports = {//打包环境，测试环境还是生产环境，不添加会报警告mode: 'development',//相对路径entry: {app: './src/index.js'},//输出配置output: {//输出在项目根目录的dist文件夹，会自动创建path: path.resolve(__dirname, './dist'),//js的文件名称filename: '[name].bundle.js',}
}

2、执行命令

yarn run webpack

会生成一个文件夹dist，包含一个app.bundle.js空的文件，这样说明初步就配置成功。

四、配置html-webpack-plugin

yarn add html-webpack-plugin --dev

webpack.config.js配置插件：

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin')module.exports = {mode: 'development',entry: {app: './src/index.js'},output: {path: path.resolve(__dirname, './dist'),filename: '[name].bundle.js',},plugins: [new HtmlWebpackPlugin({//模板路径，注意需要和index.html路径对应template: path.resolve(__dirname, './public/index.html'),//文件名称filename: 'index.html',})]
}

再次执行：

yarn run webpack

会在dist文件夹下生成app.bundle.js和index.html，并且自动添加了<script defer src="app.bundle.js"></script>。

五、配置其他webpack插件

每次打包都会生成dist文件夹，有的可能不需要，就需要在打包前清理，每次手动清理太麻烦，添加插件自动清理，有时候还需要检查错误，有需要error插件。

yarn add clean-webpack-plugin friendly-errors-webpack-plugin --dev

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin')
const {CleanWebpackPlugin} = require("clean-webpack-plugin");
const friendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin');module.exports = {……省略……plugins: [new HtmlWebpackPlugin({template: path.resolve(__dirname, './public/index.html'),filename: 'index.html',}),new CleanWebpackPlugin(),new friendlyErrorsWebpackPlugin(),]
}

六、支持jsx语法

1、添加React支持

yarn add react react-dom

2、添加jsx的babel

yarn add @babel/preset-react --dev

3、配置webpack.config.js

module.exports = {……省略……module: {rules: [{test: /\.(js|jsx)$/,loader: 'babel-loader',exclude: /node_modules/}],}
}

4、根目录下新建.babelrc文件，添加：

{"presets": ["@babel/preset-react","@babel/preset-env"]
}

5、在src/index.js下添加

import React from 'react'
import ReactDOM from 'react-dom'
import App from "./App";ReactDOM.render(<App />,document.getElementById('root')
)

再次执行：

yarn run webpack

预览dist/index.html显示内容，说明就集成成功。

七、实时预览

每次预览都需要yarn run webpack太麻烦，需要配置service自动加载。

1、添加

yarn add webpack-dev-server --dev

2、配置

module.exports = {……省略……devServer: {static: {directory: path.join(__dirname, './dist'),},compress: true,port: 3100,}
}

4、开启端口监听

yarn run webpack serve

访问http://localhost:3100/会显示预览内容，修改index.js内容并保存，会实时更新。

八、配置scripts

在package.json添加：


"scripts": {"build": "webpack","start": "webpack serve"
}

运行：

yarn start：开启服务
yarn build：重新打包

九、项目结构

1、package.json：

{"homepage": "./","name": "comments-app","version": "1.0.0","description": "","main": "index.js","scripts": {"build": "webpack","start": "webpack serve"},"author": "","license": "ISC","dependencies": {"react": "^17.0.2","react-dom": "^17.0.2"},"devDependencies": {"@babel/core": "^7.17.5","@babel/preset-env": "^7.16.11","@babel/preset-react": "^7.16.7","babel-loader": "^8.2.3","clean-webpack-plugin": "^4.0.0","css-loader": "^6.7.0","file-loader": "^6.2.0","friendly-errors-webpack-plugin": "^1.7.0","html-webpack-plugin": "^5.5.0","sass-loader": "^12.6.0","style-loader": "^3.3.1","url-loader": "^4.1.1","webpack": "^5.70.0","webpack-cli": "^4.9.2","webpack-dev-server": "^4.7.4","webpack-merge": "^5.8.0"}
}

2、项目结构如下：

3、下载地址：

https://download.csdn.net/download/yoonerloop/83976375