Example projects (JS / TS) for node backend use of MF (#4316)

* updated js and ts project examples for node dynamic remote loading

* remove old dynamic-remote-nodes project and replace with the new one

* fix for project dynamic-remotes-node-javascript rename to dynamic-remotes-node

Author: arimus

dynamic-remotes-node-typescript/.gitignore

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+.idea
+node_modules
+host/dist
+remote/dist

dynamic-remotes-node-typescript/.nvmrc

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+v20.12.0

dynamic-remotes-node-typescript/README.md

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+# Dynamic Remotes on Node w/ TypeScript
+
+Similar to browser side dynamic remotes.
+
+This allows you to dynamically load remote containers on the server.
+
+`pnpm run start` will initiate a build and http server, then the node will load the remotes. The host will poll for changes on the remote and reload when they are detected.
+
+NOTE: HMR is not supported on the server side yet, so we can't get notified of changes in the remote. We have to poll for changes.

dynamic-remotes-node-typescript/host/package-lock.json

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+{}

dynamic-remotes-node-typescript/host/package.json

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+import { loadRemote, init } from '@module-federation/runtime';
+import {performReload, revalidate } from '@module-federation/node/utils';
+
+console.log('hello from host host');
+
+let instance;
+let loadedString;
+let loadedClass: (new() => any) | null;
+let loadedClassInstance;
+
+async function initAndLoad() {
+  await performReload(true)
+
+  // here we assign the return value of the init() function, which can be used to do some more complex
+  // things with the module federation runtime
+  instance = init({
+    name: 'host',
+    remotes: [
+      {
+        name: 'remote',
+        entry: 'http://localhost:3002/remoteEntry.js',
+      },
+    ],
+  });
+
+  // NOTE - below we use .default as the "export default" style in the remote. This changes
+  // based on the remote's export style.
+  //
+  // Other examples:
+  // - using module.exports would not require the .default
+  // - using named exports would require the specific export name on the remotely loaded object
+  //   (e.g. export class TestClass {} would require loadedObject.TestClass)
+
+  loadedString = (await loadRemote('remote/string') as any).default;
+  console.log('loaded string', loadedString);
+
+  loadedClass = (await loadRemote('remote/class') as any).default;
+  loadedClassInstance = loadedClass ? new loadedClass() : null;
+
+  console.log('current loaded class', loadedClass);
+  console.log('current loaded class test value', loadedClassInstance?.getTestValue());
+  console.log('current loaded class run test', await loadedClassInstance?.runTest());
+}
+
+initAndLoad();
+
+setInterval(async () => {
+  console.log('host(): checking remote for updates');
+
+  // NOTE: this is called the first time an update is detected on the remote and never again
+  // NOTE: had to patch hot-reload.js to get this to not throw an error
+  // we automatically reset require cache, so the reload callback is only if you need to do something else
+  const shouldReload = await revalidate();
+
+  // do something extra after revalidation
+  if (shouldReload) {
+    // reload the server
+    console.log('host(): should reload');
+    initAndLoad();
+  } else {
+    console.log('host(): should not reload');
+  }
+}, 5000);

dynamic-remotes-node-typescript/host/src/index.ts

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+{
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist"
+  },
+  "include": ["src/**/**.ts"],
+  "exclude": ["node_modules", "!node_modules/@types"]
+}

dynamic-remotes-node/app1/noop.js renamed to dynamic-remotes-node-typescript/host/src/noop.ts

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+const { UniversalFederationPlugin } = require('@module-federation/node');
+const webpack = require('webpack');
+
+module.exports = {
+  entry: './src/index.ts',
+  mode: 'development',
+  target: 'async-node',
+  externals: [],
+  output: {
+    publicPath: 'http://localhost:3001/',
+    library: { type: 'commonjs-module' },
+  },
+  resolve: {
+    extensions: ['.ts', '.tsx', '.js'],
+  },
+  module: {
+    noParse: /yargs/,
+    rules: [
+      {
+        test: /\.tsx?$/,
+        use: [
+          {
+            loader: 'ts-loader',
+            options: {
+              transpileOnly: false, // Enables type-checking and .d.ts file emission
+            },
+          },
+        ],
+        exclude: /node_modules/,
+      },
+    ],
+  },
+  plugins: [
+    new webpack.HotModuleReplacementPlugin(),
+    new UniversalFederationPlugin({
+      remoteType: 'script',
+      isServer: true,
+      name: 'host',
+      useRuntimePlugin: true,
+      exposes: {
+        './noop': './src/noop.ts',
+      },
+    }),
+  ],
+};