Building and Deploying a Micro-Frontend

Outline the steps required to build a specific micro-frontend and deploy it independently from other micro-frontends.
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(<App />, document.getElementById('root'));
This is the entry point of a React micro-frontend app where the 'App' component is the root component of the micro-frontend. This code mounts the React app to an HTML element with the id 'root'.
import { registerMicroApp, start } from 'qiankun';

// Define the micro-frontend
  name: 'micro-frontend-name',
  entry: '//localhost:3000',
  container: '#micro-frontend-container',
  activeRule: '/your-active-rule',

This code uses the 'qiankun' library to register a micro-frontend and specify its entry URL, container element, and the route under which it should be activated. Then, it starts the micro-frontend integration.
const express = require('express');
const path = require('path');
const app = express();

// Serve static files from the React app build
app.use(express.static(path.join(__dirname, 'build')));

app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'build', 'index.html'));

const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`Micro-frontend is running at http://localhost:${port}/`);
This is a straightforward Express server that serves a production build of the micro-frontend. It listens on port 3000 or another port specified by the PORT environment variable.
import { defineConfig } from 'vite';
export default defineConfig({
  // Define configuration specific to micro-frontends
  build: {
    outDir: 'dist',
    rollupOptions: {
      // Ensure we're properly including/excluding dependencies
      external: ['react', 'react-dom'],
      output: {
        format: 'es',
        // Replace 'my-micro-frontend' with the actual name
        entryFileNames: `my-micro-frontend.js`,
This code provides an example configuration for a build tool like Vite, specifying build output directory and Rollup options such as module format and filename for the micro-frontend entry file.
// Deployment script
const { exec } = require('child_process');
const path = require('path');

// Building the micro-frontend
exec('npm run build', { cwd: path.resolve(__dirname, 'micro-frontend-directory') }, (error) => {
  if (error) {
    console.error('Error during build:', error);
  console.log('Build completed successfully.');

  // You could integrate with any deployment services or custom scripts here
  // For example, code to deploy to AWS S3 could be placed here.
This node script automates the build process using `npm run build`. After build completion, it could integrate with a deployment service or custom deployment scripts to deploy the built micro-frontend.