Micro Frontends Architecture with Module Federation · Lezione

Creazione di una semplice app federata

Sviluppate un esempio di base funzionante di un'applicazione Micro Frontend utilizzando Module Federation.

Creazione di una semplice app federata è una lezione Micro Frontends Architecture with Module Federation gratuita su CoddyKit. Questa è la lezione 3 di 4. Puoi leggere la lezione completa qui gratuitamente — poi esercitati direttamente nel browser con un editor di codice integrato e un tutor IA disponibile 24/7. Fa parte del percorso di apprendimento Micro Frontends Architecture with Module Federation, e i tuoi progressi si sincronizzano tra il web e l'app CoddyKit. Il corso Micro Frontends Architecture with Module Federation include 4 lezioni in totale.

Parti di questa lezione non sono ancora state tradotte e vengono mostrate in inglese.

Our First Federated App

Welcome to building your first Micro Frontend application! In previous lessons, we learned about setting up Webpack for Module Federation and the core concepts of exposing and consuming modules.

Now, we'll bring those concepts together to build a basic, runnable example. Our goal is to create a Host Application that consumes a simple Button component from a separate Remote Application.

Remote App: The Component

First, let's create a simple React component in our Remote Application that we intend to share. This will be a basic button.

Imagine this component lives in src/components/MyButton.js within your remote project.

import React from 'react';

const MyButton = () => {
  return (
    <button style={{
      padding: '10px 15px',
      backgroundColor: '#61dafb',
      color: 'white',
      border: 'none',
      borderRadius: '5px',
      cursor: 'pointer'
    }}>
      Remote Button
    </button>
  );
};

export default MyButton;

Remote App: Entry Point

This is the main entry file for our Remote Application. It will render its own content and also make the MyButton component available for exposure.

This code represents src/index.js in your Remote App.

import React from 'react';
import ReactDOM from 'react-dom';
import MyButton from './components/MyButton';

const App = () => {
  return (
    <div style={{ padding: '20px', border: '2px dashed #61dafb', margin: '10px' }}>
      <h2>Remote App Content</h2>
      <p>This part is rendered directly by the Remote App.</p>
      <MyButton />
      <p>The button above is our shared component.</p>
    </div>
  );
};

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

Remote App: Webpack Exposing

To make MyButton available to other applications, we configure the Remote App's webpack.config.js using the ModuleFederationPlugin. We specify its name, the filename for its manifest, and the exposes property.

const { ModuleFederationPlugin } = require('webpack').container;

module.exports = {
  // ... other webpack configuration
  plugins: [
    new ModuleFederationPlugin({
      name: 'remoteApp',
      filename: 'remoteEntry.js',
      exposes: {
        './MyButton': './src/components/MyButton',
      },
      shared: {
        react: { singleton: true, requiredVersion: '^17.0.2' },
        'react-dom': { singleton: true, requiredVersion: '^17.0.2' },
      },
    }),
  ],
};

Host App: Main Structure

Now, let's look at our Host Application. Initially, it's a standard React application. We'll modify its main entry file (src/index.js) to consume the remote component.

import React from 'react';
import ReactDOM from 'react-dom';

const App = () => {
  return (
    <div style={{ padding: '20px', border: '2px solid #50b0ff', margin: '10px' }}>
      <h2>Host Application Content</h2>
      <p>This content is rendered by the Host App.</p>
      {/* The remote button will appear below this text */}
    </div>
  );
};

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

Host App: Webpack Consuming

The Host App's webpack.config.js needs to know about the Remote App. We use the remotes property within ModuleFederationPlugin to define the remote and its entry file URL.

Remember to adjust the http://localhost:8081 URL to where your remote application is actually served.

const { ModuleFederationPlugin } = require('webpack').container;

module.exports = {
  // ... other webpack configuration
  plugins: [
    new ModuleFederationPlugin({
      name: 'hostApp',
      remotes: {
        remoteApp: 'remoteApp@http://localhost:8081/remoteEntry.js', // Adjust port if needed
      },
      shared: {
        react: { singleton: true, requiredVersion: '^17.0.2' },
        'react-dom': { singleton: true, requiredVersion: '^17.0.2' },
      },
    }),
  ],
};

Host App: Loading Remote Component

With the Webpack configuration in place, we can now dynamically import and render the MyButton component from our Remote App into the Host App. We use React's lazy and Suspense for this.

This code updates src/index.js in your Host App.

import React, { Suspense } from 'react';
import ReactDOM from 'react-dom';

// Dynamically import the remote component
const RemoteMyButton = React.lazy(() => import('remoteApp/MyButton'));

const App = () => {
  return (
    <div style={{ padding: '20px', border: '2px solid #50b0ff', margin: '10px' }}>
      <h2>Host Application Content</h2>
      <p>This content is rendered by the Host App.</p>
      <Suspense fallback={<div>Loading Remote Button...</div>}>
        <RemoteMyButton />
      </Suspense>
      <p>The button above is loaded from the Remote App!</p>
    </div>
  );
};

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

Running Both Applications

To see your federated application in action, you need to run both the Remote and Host applications concurrently. Each application will typically have its own development server.

Step 1: Start the Remote App
Navigate to your Remote App's directory in a terminal and run npm start (or similar command).
Step 2: Start the Host App
Open another terminal, navigate to your Host App's directory, and run npm start.
Step 3: Open the Host App
Access the Host App's URL in your browser (e.g., http://localhost:8080 if that's its port).

Verify the Integration

When you open the Host App in your browser, you should see:

Content rendered directly by the Host Application.
A 'Loading Remote Button...' fallback message briefly.
The 'Remote Button' component, visually styled and provided entirely by the Remote Application, appearing within the Host App's layout.

This demonstrates a basic, yet powerful, example of Module Federation in action!

Federated App Check

Let's check your understanding of building a simple federated app.

Recap: Federated Success!

Congratulations! You've successfully built a basic Micro Frontend application using Module Federation.

We defined a component in a Remote App.
Configured the Remote App's Webpack to expose that component.
Set up the Host App's Webpack to consume from the remote.
Used React's lazy and Suspense to dynamically load the remote component.

This foundational example opens the door to creating more complex, independently deployable Micro Frontends!

Domande Frequenti

La lezione «Creazione di una semplice app federata» è gratuita?

Sì — il testo completo di «Creazione di una semplice app federata» è gratuito qui sul web. Per esercitarvi in modo interattivo (un editor di codice integrato e un tutor IA 24/7) e sbloccare il resto del corso Micro Frontends Architecture with Module Federation, passa a CoddyKit PRO. Il corso Micro Frontends Architecture with Module Federation include 4 lezioni in totale.

Cosa imparerò in «Creazione di una semplice app federata»?

Sviluppate un esempio di base funzionante di un'applicazione Micro Frontend utilizzando Module Federation. Eserciti Micro Frontends Architecture with Module Federation con codice pratico che esegui direttamente nel browser, e un tutor IA 24/7 risponde alle tue domande mentre lavori sulla lezione.

Ho bisogno di esperienza per iniziare Micro Frontends Architecture with Module Federation?

Non è richiesta alcuna esperienza precedente. Micro Frontends Architecture with Module Federation su CoddyKit è strutturato per principianti e studenti avanzati, quindi puoi iniziare da qui o dall'inizio e procedere al tuo ritmo. Questa è la lezione 3 di 4.

Quanto tempo richiede la lezione «Creazione di una semplice app federata»?

La maggior parte delle lezioni CoddyKit richiede circa 5–10 minuti. Ogni lezione è breve e interattiva, quindi fai progressi costanti e riprendi esattamente da dove hai lasciato su web e app.

Posso scrivere ed eseguire codice in questa lezione Micro Frontends Architecture with Module Federation?

Sì. Ogni lezione Micro Frontends Architecture with Module Federation include un editor di codice integrato, quindi scrivi ed esegui codice reale direttamente nel tuo browser e ricevi feedback istantaneo dall'IA — nessuna configurazione locale necessaria.

Tutte le lezioni di questo corso

Configurazione e setup del progetto
Condivisione di moduli e componenti
Creazione di una semplice app federata
Eseguire e sottoporre a debug localmente l’app federata

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