How to handle multiple instances of microfrontends in Angular 17?

To handle multiple instances of microfrontends in Angular 17, you can use a combination of tools and strategies to manage their integration smoothly. Microfrontends allow for a scalable architecture where different frontend teams can work independently on parts of a large application. Here’s how you can set this up in Angular:

1. Module Federation

Angular 17 continues to support Module Federation, a Webpack feature that enables JavaScript applications to dynamically load code from other applications. This is particularly useful for microfrontends.

Setup:

• Host Configuration: In the Webpack configuration of the host application, you need to set up the ModuleFederationPlugin to define which microfrontends (remote entries) it can consume.

// webpack.config.js
const ModuleFederationPlugin = require("webpack/lib/container/ModuleFederationPlugin");

module.exports = {
  plugins: [
    new ModuleFederationPlugin({
      name: 'host',
      remotes: {
        microfrontend1: 'microfrontend1@http://domain.com/microfrontend1/remoteEntry.js',
        microfrontend2: 'microfrontend2@http://domain.com/microfrontend2/remoteEntry.js',
      },
      shared: {
        '@angular/core': { singleton: true, strictVersion: true },
        '@angular/common': { singleton: true, strictVersion: true },
        '@angular/router': { singleton: true, strictVersion: true },
        // other shared dependencies
      },
    }),
  ],
};

• Microfrontend Configuration: Each microfrontend should have its own Webpack configuration using ModuleFederationPlugin to expose itself as a remote entry.

Usage:

• You can dynamically load a microfrontend in an Angular component using loadRemoteModule() from @angular-architects/module-federation.

2. Routing Integration

Angular 17 came and Bootstrap 5 also. If you are new then you must check below two links:

• Angular 17 Basic Tutorials
• Bootstrap 5

To integrate multiple microfrontends seamlessly, use Angular’s Router. You can configure the router to load different microfrontends based on routes.

import { loadRemoteModule } from '@angular-architects/module-federation';

const routes: Routes = [
  {
    path: 'microfrontend1',
    loadChildren: () => loadRemoteModule({
      remoteEntry: 'http://domain.com/microfrontend1/remoteEntry.js',
      remoteName: 'microfrontend1',
      exposedModule: './Module'
    }).then(m => m.AppModule)
  },
  {
    path: 'microfrontend2',
    loadChildren: () => loadRemoteModule({
      remoteEntry: 'http://domain.com/microfrontend2/remoteEntry.js',
      remoteName: 'microfrontend2',
      exposedModule: './Module'
    }).then(m => m.AppModule)
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

3. State Management

When dealing with multiple microfrontends, maintaining a consistent state across them can be challenging. Consider using a global state management solution like NgRx or a shared JavaScript context (like Redux) that all microfrontends can access.

4. Communication Between Microfrontends

For communication between microfrontends:

• Custom Events: Use the browser’s custom event system to emit and listen for events.
• RxJS: Share a BehaviorSubject or a Subject to emit and subscribe to data changes across different parts of the application.

Best Practices

• Isolation: Ensure each microfrontend is independent in terms of its dependencies and build process.
• Consistency: Use a design system to keep UI components consistent across different microfrontends.
• Version Control: Carefully manage versions of shared libraries to avoid conflicts.

By leveraging these strategies, you can effectively manage multiple microfrontends in Angular 17, allowing different teams to work autonomously while maintaining a cohesive application structure.

Jassa

Thanks