模块联邦概念

模块联邦由webpack 5最先推出的,让应用加载远程的代码模块来实现不同的Web应用共享代码片段.模块联邦分为两个角色,一个是生产者,一个是消费者.生产者暴露代码供消费者消费
(用一个不太精准的比喻 这个就是webpack内置的cdn)

实现思路

1. 首先要先将vue-cli升级到5 具体在上一篇
2. 针对模块联邦进行配置

配置

我是vue-cli 接入webpack应用,vue-cli接vue-cli用vue-cli的配置就好了
webpack生产者 webpack.config.js

const { ModuleFederationPlugin } = require("webpack").container;
const path = require("path");module.exports = {entry: "./index.js",mode: "development",output: {publicPath: "http://localhost:6780/",clean: true,},devServer: {static: {directory: path.join(__dirname, "dist"),},compress: true,port: 6780,},optimization: {splitChunks: false,//splitChunks和mf冲突不能用},plugins: [new ModuleFederationPlugin({name: "moduleFederationLib",filename: "remoteEntry.js",library: { type: "window", name: "moduleFederationLib" },exposes: {"./react": "react","./react-dom": "react-dom",'./apiUrl':"./src/utils/apiUrl"},}),],
};

vue-cli生产者 vue.config.js

// vue.config.js
module.exports = {publicPath: "http://localhost:4567/",chainWebpack: (config) => {/* module federation plugin import */config.optimization.delete("splitChunks");config.plugin("module-federation-plugin").use(require("webpack").container.ModuleFederationPlugin, [{name: "home", // 模块名称(必须唯一)filename: "remoteEntry.js",//加载的文件名library: { type: "window", name: "home" },//type:指定如何将远程模块暴露给其他应用 设置成window才能找到exposes: {// 对外暴露的组件"./HelloWorld": "./src/components/HelloWorld.vue",},},]);},// devSever 一定要设置跨域 能够跨域是整个mf的基础devServer: {port: 4567,hot: true,headers: {"Access-Control-Allow-Origin": "*","Access-Control-Allow-Methods": "GET, POST, PUT, DELETE, PATCH, OPTIONS","Access-Control-Allow-Headers":"X-Requested-With, content-type, Authorization",},},
};

vue-cli消费者 webpack.config.js

module.exports = {configureWebpack: {resolve: {fallback: {//禁止webpack在找不到引入的文件的时候用fs模块去查找//模块联邦的模块就是找不到的 webpack尝试在/src下找 在不到再报错 根本就不到远程fs: false }},},chainWebpack: (config) => {/* module federation plugin import */config.optimization.delete("splitChunks");//splitChunks和mf冲突不能用config.plugin("module-federation-plugin").use(require("webpack").container.ModuleFederationPlugin, [{name: "app",remotes: {// 导入 home: "home@http://localhost:4567/remoteEntry.js","moduleFederationLib"://remote模块的module Name是不能带 - 不然会导致导入失败"moduleFederationLib@http://localhost:6780/remoteEntry.js",},},]);},
};

消费者使用:

<script>javascript">
export default {name: 'App',components: {HelloWorld: () => import('home/HelloWorld')},mounted() {//采用异步导入import('moduleFederationLib/apiUrl').then(({default: apiUrl}) =>{console.log('apiUrl!',apiUrl)})}
}
</script>

遇到的问题:

问题1.引入远程模块后Uncaught TypeError: Cannot read properties of undefined (reading ‘call’),不引入就没有这个问题

解决方法:

1. 检查生产者的remoteEntry.js是否正确启动
2. 检查config中library是否已经设置成window,如果成功设置成window在控制台可以检查

问题2.ScriptExternalLoadError: Loading script failed

解决方法:

1. 检查splitChunks是否已经设置成false
2. 检查生产者的remoteEntry.js是否正确启动

问题3.不能够像webpack示例一样 使用静态导入远程模块

原因:
mf提供的模块是远程模块,必须要先加载远程模块才能够像静态模块一样使用

解决方法:
使用动态加载远程模块,再加载消费者
注意:import 静态导入的模块会提升至顶层,所以必须使用动态导入
bootstrap.js

//bootstrap.js
import Vue from 'vue';
Vue.config.productionTip = false;const loadRemoteAndInitApp = async () => {try {//先动态导入远程模块const remote = await import('moduleFederationLib/apiUrl');console.log('Successfully loaded remote component:', remote);//导入成功之后再加载App.vue(消费模块的页面) 一定要确保先加载模块再导入消费者const App = (await import('./App.vue')).default;//创建并挂载 Vue 实例new Vue({render: h => h(App),}).$mount('#app');console.log('Vue app has been mounted.');} catch (error) {console.error('Error loading remote component or initializing Vue app:', error);}
};loadRemoteAndInitApp();

main.js

import './bootstrap'

远程模块消费者App.vue

import APIURl from 'moduleFederationLib/apiUrl'
// 下面就跟正常从文件夹导入就行