关于javascript:Webpack5-搭建-React-多页面应用

介绍

react-multi-page-app 是一个基于 webpack5 搭建的 react 多页面利用。

为什么搭建多页面利用：

• 多个页面之间业务互不关联，页面之间并没有共享的数据
• 多个页面应用同一个后端服务、应用通用的组件和根底库

搭建多页面利用的益处：

• 保留了传统单页利用的开发模式：反对模块化打包，你能够把每个页面看成是一个独自的单页利用
• 独立部署：每个页面互相独立，能够独自部署，解耦我的项目的复杂性，甚至能够在不同的页面抉择不同的技术栈
• 缩小包的体积，优化加载渲染流程

疾速上手

clone

git clone https://github.com/zhedh/react-multi-page-app.git

装置依赖

yarn install

开发

yarn start

http://localhost:8000/page1

打包

yarn build

繁难搭建流程

npm 初始化

yarn init

约定目录

|____README.md
|____package.json
|____src
| |____utils
| |____components
| |____pages
| | |____page2
| | | |____index.css
| | | |____index.jsx
| | |____page1
| | | |____index.css
| | | |____index.jsx

Webpack 配置

装置 Webpack

yarn add -D 能够应用 npm i –save-dev 代替

yarn add -D webpack webpack-cli

创立配置文件

touch webpack.config.js

入口配置

module.exports = {
  entry: {
    page1: "./src/pages/page1/index.jsx",
    page2: "./src/pages/page2/index.jsx",
    // ...
  },
};

输入配置

module.exports = {
  entry: {
    page1: "./src/pages/page1/index.jsx",
    page2: "./src/pages/page2/index.jsx",
    // ...
  },
  output: {path: path.resolve(__dirname, "./dist"),
    filename: "[name]/index.js",
  },
};

js|jsx 编译

装置 babel 插件

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

module.exports = {
  ...
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
}

css 编译

装置 loader

yarn add -D style-loader css-loader

module.exports = {
  ...
  module: {
    ...
    rules: [
      {
        test: /\.css$/i,
        use: [
          'style-loader',
          'css-loader'
        ],
      },
    ]
  },
}

html 插件配置

装置 html-webpack-plugin

yarn add -D html-webpack-plugin

module.exports = {
  ...
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'page1/index.html',
      chunks: ['page1']
    }),
    new HtmlWebpackPlugin({
      filename: 'page2/index.html',
      chunks: ['page2']
    }),
  ],
}

页面编辑

page1

index.jsx

import "./index.css";

document.querySelector("body").append("PAGE1");

index.css

body {color: blue;}

page2

index.jsx

import "./index.css";

document.querySelector("body").append("PAGE2");

index.css

body {color: green;}

打包

执行

webpack

输入 dist 包产物如下：

├── page1
│   ├── index.html
│   └── index.js
└── page2
    ├── index.html
    └── index.js

残缺的配置文件

webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");

module.exports = {
  entry: {
    page1: "./src/pages/page1/index.jsx",
    page2: "./src/pages/page2/index.jsx",
  },
  output: {path: path.resolve(__dirname, "./dist"),
    filename: "[name]/index.js",
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: ["style-loader", "css-loader"],
      },
      {
        test: /\.m?jsx$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: "babel-loader",
          options: {presets: ["@babel/preset-env"],
          },
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "page1/index.html",
      chunks: ["page1"],
      // chunks: ['page1', 'page1/index.css']
    }),
    new HtmlWebpackPlugin({
      filename: "page2/index.html",
      chunks: ["page2"],
    }),
  ],
};

package.json

{
  "name": "react-multi-page-app",
  "version": "1.0.0",
  "description": "React 多页面利用",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "@babel/core": "^7.12.9",
    "@babel/preset-env": "^7.12.7",
    "babel-loader": "^8.2.2",
    "css-loader": "^5.0.1",
    "html-webpack-plugin": "^4.5.0",
    "style-loader": "^2.0.0",
    "webpack": "^5.9.0",
    "webpack-cli": "^4.2.0"
  }
}

去 github 查看简易版残缺代码 react-multi-page-app

流程优化

拆散开发生产环境

新建 config 目录，并创立配置文件

mkdir config
cd config
touch webpack.base.js
touch webpack.dev.js
touch webpack.prod.js

├── webpack.base.js
├── webpack.dev.js
└── webpack.prod.js

根底配置

webpack.base.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");

module.exports = {
  entry: {
    page1: "./src/pages/page1/index.jsx",
    page2: "./src/pages/page2/index.jsx",
  },
  output: {path: path.resolve(__dirname, "./dist"),
    filename: "[name]/index.js",
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: ["style-loader", "css-loader"],
      },
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: "babel-loader",
          options: {presets: ["@babel/preset-env"],
          },
        },
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "page1/index.html",
      chunks: ["page1"],
    }),
    new HtmlWebpackPlugin({
      filename: "page2/index.html",
      chunks: ["page2"],
    }),
  ],
};

开发配置

• 装置 webpack-merge，用于合并 webpack 配置信息

yarn add -D webpack-merge

• 装置 webpack-dev-server，用于启动开发服务

yarn add -D webpack-dev-server

• 开发配置如下

webpack.dev.js

const {merge} = require("webpack-merge");
const path = require("path");
const base = require("./webpack.base");

module.exports = merge(base, {
  mode: "development",
  devtool: "inline-source-map",
  target: "web",
  devServer: {
    open: true,
    contentBase: path.join(__dirname, "./dist"),
    historyApiFallback: true, // 不跳转
    inline: true, // 实时刷新
    hot: true, // 开启热更新,
    port: 8000,
  },
});

• 配置启动命令

package.json

{
  "scripts": {"start": "webpack serve --mode development --env development --config config/webpack.dev.js"},
}

• 启动

yarn start

• 预览

http://localhost:8000/page1
http://localhost:8000/page2

生产配置

• 配置如下

webpack.prod.js

const {merge} = require('webpack-merge')
const base = require('./webpack.base')

module.exports = merge(base, {mode: 'production',})

• 配置打包命令

package.json

{
  "scripts": {
    "start": "webpack serve --mode development --env development --config config/webpack.dev.js",
    "build": "webpack --config config/webpack.prod.js"
  },
}

• 打包

yarn build

引入 React

以 page1 页面为例

• 约定目录

├── page1
│   ├── app.jsx
│   ├── index.jsx
│   └── index.css
└── page2
    ├── app.js
    ├── index.jsx
    └── index.css

• 装置 react

yarn add react react-dom

• 代码如下

app.js

import React from 'react'

function App() {
  return (
    <div id="page1">
      我是 PAGE1，Hello World
    </div>
  )
}

export default App

index.js

import React from 'react'
import ReactDOM from 'react-dom'
import App from './app'
import './index.css'

ReactDOM.render(<App />, document.getElementById('root'))

index.css

body{background-color: #ccc;}

#page1 {color: rebeccapurple;}

• 增加 react 编译

webpack.base.js

module.exports = {
  module: {
    // ...
    rules: [
      // ...
      {
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {presets: ['@babel/preset-react', '@babel/preset-env'],
            plugins: ['@babel/plugin-proposal-class-properties']
          }
        }
      }
    ]
  },
  // ...
}

• 省略获取文件后缀

webpack.base.js

module.exports = {
  // ...
  resolve: {extensions: ['.js', '.jsx', '.json']
  }
}

• 增加 html 默认模版，挂载 React DOM

cd src
touch template.html

template.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="root"></div>
</body>

</html>

webpack.base.js

module.exports = {
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'page1/index.html',
      chunks: ['page1'],
      template: './src/template.html'
    }),
    new HtmlWebpackPlugin({
      filename: 'page2/index.html',
      chunks: ['page2'],
      template: './src/template.html'
    }),
  ],
}

• 装置依赖

yarn add @babel/preset-react @babel/plugin-proposal-class-properties

引入 Sass

以 page1 为例

• 将 index.css 变更为 index.scss

index.scss

body {
  background-color: #ccc;

  #page1 {color: rebeccapurple;}
}

• 增加 scss 编译

webpack.base.js

module.exports = {
  // ...
  module: {
    // ...
    rules: [
      {test: /\.(sa|sc|c)ss$/,
        use: [
          'style-loader',
          'css-loader',
          'resolve-url-loader',
          'sass-loader'
        ]
      },
    ]
  },
  // ...
}

• 装置依赖

yarn add -D resolve-url-loader sass-loader

到此，一个残缺的 React 多页面利用搭建实现，查看残缺代码 react-multi-page-app

入口配置和模版主动匹配

为了不必每次新增页面都要新增入口页面配置，咱们将入口配置改成主动匹配

• 入口文件主动匹配

cd config
touch webpack.util.js

webpack.util.js

const glob = require('glob')

function setEntry() {const files = glob.sync('./src/pages/**/index.jsx')
  const entry = {}
  files.forEach(file => {const ret = file.match(/^\.\/src\/pages\/(\S*)\/index\.jsx$/)
    if (ret) {entry[ret[1]] = {import: file,}
    }
  })

  return entry
}

module.exports = {setEntry,}

webpack.base.js

const {setEntry} = require('./webpack.util')

module.exports = {entry: setEntry,}

• 拆分 React 依赖，将 React 独自打包出一个 bundle，作为公共依赖引入各个页面

webpack.util.js

function setEntry() {const files = glob.sync('./src/pages/**/index.jsx')
  const entry = {}
  files.forEach(file => {const ret = file.match(/^\.\/src\/pages\/(\S*)\/index\.jsx$/)
    if (ret) {entry[ret[1]] = {
        import: file,
        dependOn: 'react_vendors',
      }
    }
  })

  // 拆分 react 依赖
  entry['react_vendors'] = {import: ['react', 'react-dom'],
    filename: '_commom/[name].js'
  }

  return entry
}

• html 模版主动匹配，并引入 react bundle

以 page1 为例子，引入页面自定义模版目录约定如下

├── app.jsx
├── index.html
├── index.jsx
└── index.scss

index.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title> 页面 1 </title>
</head>

<body>
  <div id="root"></div>
</body>

</html>

如果匹配不到自定义模版，会匹配默认模版，配置如下：

webpack.util.js

function getTemplate(name) {const files = glob.sync(`./src/pages/${name}/index.html`)
  if (files.length > 0) {return files[0]
  }
  return './src/template.html'
}

function setHtmlPlugin() {const files = glob.sync('./src/pages/**/index.jsx')
  const options = []
  files.forEach(file => {const ret = file.match(/^\.\/src\/pages\/(\S*)\/index\.jsx$/)
    if (ret) {const name = ret[1]
      options.push(new HtmlWebpackPlugin({filename: `${name}/index.html`,
        template: getTemplate(name),
        chunks: ['react_vendors', name,]
      }))
    }
  })
  return options
}

module.exports = {
  setEntry,
  setHtmlPlugin
}

webpack.base.js

const {setEntry, setHtmlPlugin} = require('./webpack.util')

module.exports = {
  plugins: [...setHtmlPlugin(),
  ]
}

• 装置相干依赖

yarn add -D html-webpack-plugin glob

配置优化

• 革除之前打包文件

webpack.base.js

const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  plugins: [new CleanWebpackPlugin(),
  ]
}

yarn add -D clean-webpack-plugin

• 拆散并压缩 css

webpack.base.js

const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')

module.exports = {
   module: {
    rules: [
      {test: /\.(sa|sc|c)ss$/,
        use: [
          // 'style-loader',
          MiniCssExtractPlugin.loader,
          'css-loader',
          'resolve-url-loader',
          'sass-loader'
        ]
      },
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({filename: '[name]/index.css',
    }),
    new OptimizeCSSPlugin({
      cssProcessorOptions: {safe: true}
    })
  ]
}

html 中注入 css
webpack.util.js

function setHtmlPlugin() {const files = glob.sync('./src/pages/**/index.jsx')
  const options = []
  files.forEach(file => {const ret = file.match(/^\.\/src\/pages\/(\S*)\/index\.jsx$/)
    if (ret) {const name = ret[1]
      options.push(new HtmlWebpackPlugin({filename: `${name}/index.html`,
        template: getTemplate(name),
        chunks: ['react_vendors', name, '[name]/index.css']
      }))
    }
  })
  return options
}

yarn add -D mini-css-extract-plugin optimize-css-assets-webpack-plugin

在 package.json 配置 sideEffects，防止 webpack Tree Shaking 移除.css、.scss 文件
package.json

​```json
{
  "sideEffects": [
    "*.css",
    "*.scss"
  ]
}

至此，我的项目配置实现

我的项目源码

残缺代码 react-multi-page-app，喜爱给个 star

问题 & 解答

Cannot read property ‘createSnapshot’ of undefined

报错：UnhandledPromiseRejectionWarning: TypeError: Cannot read property ‘createSnapshot’ of undefined

起因：因为同时运行 2 个不同版本的 webpack。咱们我的项目中没有装置 webpack-cli，webpack 会默认应用全局的 webpack-cli，webpack5 和 webpack-cli3 不兼容

解决：降级全局 webpack-cli3 到 webpack-cli4 或在我的项目中装置最新版本的 webpack-cli4

参考：https://github.com/jantimon/h…