Step-by-step guide to upgrading an existing project to Angular 19

Upgrading an existing Angular project to Angular 19 ensures better performance, security, and new features. However, upgrading requires careful planning to avoid breaking changes. This guide will walk you through updating dependencies, testing compatibility, and fixing issues in a structured way.

Step 1: Check Current Angular Version

1. Open the terminal and navigate to your Angular project:

cd your-angular-project

Check the current Angular version:

ng version

Step 2: Update Angular CLI and Core Packages

1. Globally update the Angular CLI:

npm install -g @angular/cli@latest

Update the project’s Angular dependencies:

ng update @angular/core @angular/cli

Update Angular Material (if used):

ng update @angular/material

Step 3: Check and Update Third-Party Dependencies

1. Identify outdated packages:

npm outdated

Update required dependencies:

npm update

Manually update critical dependencies (e.g., RxJS, TypeScript):

npm install rxjs@latest typescript@latest

If using NgRx, update it as well:

ng update @ngrx/store

Step 4: Fix Breaking Changes

1. Check Angular’s official upgrade guide for breaking changes:
   Angular Update Guide
2. Fix TypeScript version issues:
   • Angular 19 requires TypeScript 5.3+. If your TypeScript version is outdated, update it:

npm install typescript@latest

Refactor deprecated APIs:

• Some functions in RxJS, Angular Forms, and HttpClient might be deprecated. Check for errors and replace deprecated methods.

Step 5: Run and Test the Application

1. Clear cache and reinstall dependencies:

rm -rf node_modules package-lock.json
npm install

Run the Angular project

ng serve --open

Fix any errors or warnings that appear in the console.

Step 6: Perform Code Cleanup and Optimization

1. Enable Standalone Components (if applicable)

import { bootstrapApplication } from '@angular/platform-browser';

bootstrapApplication(AppComponent);

Optimize lazy loading for better performance:

const routes: Routes = [
    { path: '', loadComponent: () => import('./home/home.component').then(m => m.HomeComponent) }
];

Improve Performance with Signals API (if migrating from older versions):

import { signal } from '@angular/core';

export class CounterComponent {
    count = signal(0);
    increment() { this.count.set(this.count() + 1); }
}

Conclusion

Upgrading to Angular 19 enhances security, performance, and developer experience. Following these step-by-step best practices ensures a smooth transition while avoiding common pitfalls. After upgrading, thoroughly test your application and utilize new Angular 19 features like Standalone APIs, improved hydration, and enhanced reactivity for better performance. 🚀

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