Angular 18: New Features, Improvements, and Comparisons with Previous Versions

Angular has long been a powerhouse in the world of web development, providing developers with a robust framework for building dynamic and scalable applications. With the release of Angular 18, the framework has taken another significant leap forward. This blog post will provide an in-depth look at Angular 18, highlighting its new features, comparing it with previous versions, and providing examples to illustrate the improvements.

Overview of Angular 18

Angular 18 introduces a range of new features and enhancements aimed at improving performance, developer experience, and scalability. These include improvements in Server-Side Rendering (SSR), differential loading, the Ivy rendering engine, the Forms module, and the Angular CLI.

Key Features of Angular 18

1. Enhanced Server-Side Rendering (SSR)

New in Angular 18:

• Optimized Rendering Pipeline: Angular 18 brings a more efficient SSR process, which results in faster page load times and better SEO.

• Simplified API: The new SSR APIs are more intuitive and easier to integrate into existing applications.

Example: In Angular 17, setting up SSR involved multiple steps and configurations. Angular 18 simplifies this with a streamlined API:

// Angular 17 SSR setup
import { ngExpressEngine } from '@nguniversal/express-engine';
import { AppServerModule } from './src/main.server';

const server = express();
server.engine('html', ngExpressEngine({
  bootstrap: AppServerModule,
}));
server.set('view engine', 'html');
server.set('views', join(process.cwd(), 'dist/app/browser'));

// Angular 18 SSR setup
import { renderModule } from '@angular/platform-server';
import { AppServerModule } from './src/main.server';

const server = express();
server.get('*', async (req, res) => {
  const html = await renderModule(AppServerModule, {
    document: '<app-root></app-root>',
    url: req.url,
  });
  res.send(html);
});

2. Differential Loading Improvements

New in Angular 18:

• Automatic Modern and Legacy Bundles: Angular 18 automatically generates separate bundles for modern and legacy browsers, optimizing load times and performance.

Example: In Angular 17, differential loading was introduced but required manual configuration. Angular 18 handles this automatically:

// Angular 17 differential loading (part of angular.json)
"architect": {
  "build": {
    "configurations": {
      "production": {
        "target": "es2015",
        "es5BrowserSupport": true
      }
    }
  }
}

// Angular 18 differential loading (automatic)
"architect": {
  "build": {
    "configurations": {
      "production": {}
    }
  }
}

3. Ivy Rendering Engine Enhancements

New in Angular 18:

• Improved Debugging: Enhanced error messages and better debugging tools make development easier.

• More Efficient Rendering: Further optimizations in the Ivy engine reduce the size of the final bundle and improve runtime performance.

Example: In Angular 17, Ivy was already a significant improvement over the previous View Engine. Angular 18 builds on this with even more efficient tree-shaking:

// Component in Angular 17 with Ivy
@Component({
  selector: 'app-example',
  template: `<div>{{ title }}</div>`,
})
export class ExampleComponent {
  title = 'Hello, World!';
}

// Component in Angular 18 with improved Ivy
@Component({
  selector: 'app-example',
  template: `<div>{{ title }}</div>`,
})
export class ExampleComponent {
  title = 'Hello, Angular 18!';
}

4. Streamlined Forms Module

New in Angular 18:

• Flexible Form Controls: More options for form controls and validations.

• Improved Reactive Forms: Enhanced integration and usability for reactive forms.

Example: In Angular 17, reactive forms were already powerful but required verbose setup. Angular 18 simplifies this:

// Angular 17 reactive forms
import { FormGroup, FormControl, Validators } from '@angular/forms';

this.form = new FormGroup({
  name: new FormControl('', Validators.required),
  email: new FormControl('', [Validators.required, Validators.email]),
});

// Angular 18 reactive forms
import { FormBuilder, Validators } from '@angular/forms';

this.form = this.fb.group({
  name: ['', Validators.required],
  email: ['', [Validators.required, Validators.email]],
});

5. Improved CLI and Tooling

New in Angular 18:

• Faster Build Processes: Optimizations in the Angular CLI improve build times.

• Intuitive Commands: New and improved CLI commands streamline development workflows.

Example: Angular 17 CLI provided a robust set of commands, but Angular 18 improves performance and usability:

# Angular 17 build command
ng build --prod

# Angular 18 build command (faster and more efficient)
ng build --configuration production

Comparing Angular 18 with Previous Versions

Performance:

• Angular 18 offers significant performance improvements over Angular 17, particularly in SSR and differential loading.

Developer Experience:

• Enhanced debugging tools and error messages in Angular 18 provide a better developer experience compared to Angular 17.

Tooling:

• The Angular 18 CLI is more efficient and user-friendly, making project setup and maintenance easier than in Angular 17.

Conclusion

Angular 18 brings a host of new features and improvements that make it easier and more efficient to build high-quality web applications. From enhanced SSR capabilities to advanced component development with Ivy, this release is packed with tools and enhancements designed to boost productivity and performance. Whether you're starting a new project or upgrading an existing one, Angular 18 offers the capabilities you need to succeed in today's fast-paced web development environment.

With Angular 18, developers can look forward to faster builds, better performance, and a more intuitive development experience. Stay tuned for more updates and tutorials on how to make the most of Angular 18.