使用webpack5模块联邦

WHAT(Module Federation 是什么?)
Module Federation [ˌfedəˈreɪʃn] 使 JavaScript 应用得以在客户端或服务器上动态运行另一个 bundle 的代码。
这其中的关键点是:动态,包含两个含义:
1、按需,可以把一个包拆开来加载其中一部分;
2、运行时,跑在浏览器而非 node 编译时;
另一个 bundle 的代码,之前应用之间做共享是在文件级或 npm 包级 export 成员,现在可以在应用级 export 成员属性。
Module Federation 里有两个主要概念 host 和 remote。每个项目可以是 host 也可以是 remote,也可以两个都是。

配置 remote
webpack.config.js
const path = require("path");const HtmlWebpackPlugin = require("html-webpack-plugin");const ModuleFederationPlugin = require("webpack/lib/container/ModuleFederationPlugin");module.exports = {mode: "development",entry: "./src/index.js",cache: {type: "filesystem",cacheDirectory: path.resolve(__dirname, "node_modules/.cache/webpack"),},output: {filename: "bundle.js",path: path.resolve(__dirname, "dist"),publicPath: "http://localhost:8000/",},devServer: {port: 8000,},optimization: {usedExports: true,},devtool: false,module: {rules: [{test: /\.js$/,use: [{loader: "babel-loader",options: {presets: ["@babel/preset-react"],},},],exclude: /node_modules/,},{test: /\.png$/,type: "asset/resource",},{test: /\.css$/,use: ["style-loader", "css-loader"],},],},plugins: [new HtmlWebpackPlugin({template: "./public/index.html",}),new ModuleFederationPlugin({ // 这里是重点部分filename: "remoteEntry.js",name: "remote",exposes: {"./NewsList": "./src/NewsList",},}),],};
src/index.js
import("./bootstrap");src/bootstrap.js
import React from "react";import ReactDOM from "react-dom";import App from "./App";ReactDOM.render(<App />, document.getElementById("root"));
src/App.js
import React from "react";import NewsList from './NewsList';const App = () => (<div><h2>本地组件NewsList</h2><NewsList /></div>);export default App;
src/NewsList.js 这个组件导出给别人使用,在 webpack 配置中可以看到。
import React from "react";export default ()=>(<div>新闻列表</div>)
配置 host
webpack.config.js
const path = require("path");const HtmlWebpackPlugin = require("html-webpack-plugin");const ModuleFederationPlugin = require("webpack/lib/container/ModuleFederationPlugin");module.exports = {mode: "development",entry: "./src/index.js",cache: {type: "filesystem",cacheDirectory: path.resolve(__dirname, "node_modules/.cache/webpack"),},output: {filename: "bundle.js",path: path.resolve(__dirname, "dist"),publicPath: "http://localhost:9000/",},devServer: {contentBase: path.join(__dirname, 'dist'),compress: true,port: 9000,},optimization: {usedExports: true,},devtool: false,module: {rules: [{test: /\.js$/,use: [{loader: "babel-loader",options: {presets: ["@babel/preset-react"],},},],exclude: /node_modules/,},{test: /\.png$/,type: "asset/resource",},{test: /\.css$/,use: ["style-loader", "css-loader"],},],},plugins: [new HtmlWebpackPlugin({template: "./public/index.html",}),new ModuleFederationPlugin({ // 这里是重点部分filename: "remoteEntry.js",name: "host",remotes: {remote: "remote@http://localhost:8000/remoteEntry.js"}})],};
src/index.js
import("./bootstrap");src/bootstrap.js
import React from "react";import ReactDOM from "react-dom";import App from "./App";ReactDOM.render(<App />, document.getElementById("root"));
src/App.js 中导入了之前别人写好的 NewsList 组件,在 webpack 配置中可以看到。
import React from "react";const RemoteNewsList = React.lazy(() => import("remote/NewsList"));const App = () => (<div><h2 >远程组件NewsList</h2><React.Suspense fallback="Loading NewsList"><RemoteNewsList /></React.Suspense></div>);export default App;
A 应用可以引用 B 整个应用,也可以应用 B 的页面和组件。这样一来,灵活性就非常大了。
配置参数
| 字段 | 类型 | 含义 |
| name | string | 必传值,即输出的模块名,被远程引用时路径为${name}/${expose} |
| library | object | 声明全局变量的方式,name为umd的name |
| filename | string | 构建输出的文件名 |
| remotes | object | 远程引用的应用名及其别名的映射,使用时以key值作为name |
| exposes | object | 被远程引用时可暴露的资源路径及其别名 |
| shared | object | 与其他应用之间可以共享的第三方依赖,使你的代码中不用重复加载同一份依赖 |
以上代码都可以在我的 demo 中看到:https://github.com/wuxianqiang/webacpk5-remote
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