Angular 15: Everything You Need to Know

Angular, the widely-used JavaScript framework, keeps evolving with the arrival of version 15. This update brings exciting new features and enhancements, alongside some important changes to be aware of. Let’s delve into the key aspects of upgrading your Angular applications to version 15.

What’s New in Angular 15?

1. Standalone Components: Build Without Modules

Angular 15 introduces a powerful feature: stable standalone components. This means you can create Angular applications without needing NgModules. This simplifies development and offers greater flexibility and modularity for your application architecture.

2. Faster Images with Stable NgOptimizedImage

The NgOptimizedImage directive reaches stability in Angular 15. This directive helps optimize image loading in your applications, leading to faster download times. By incorporating it into components, you can significantly improve overall application performance.

3. Directives for Host Elements: More Control

Angular 15 introduces the directive composition API, allowing you to add directives directly to host elements. This functionality addresses a common request from developers and empowers you to enhance component behavior without relying on inheritance.

4. Improved Error Tracking with Enhanced Stack Traces

In collaboration with Google Chrome developers, Angular 15 brings cleaner stack traces to the table. This simplifies the debugging process for your Angular applications. The revamped stack traces focus more on your application-specific code and pinpoint runtime issues more effectively.

5. Stable Material Design Components (MDC)

Many components in Angular Material have been redesigned in Angular 15 to leverage Material Design Components (MDC) for the Web. This not only improves accessibility but also ensures your application adheres more closely to Material Design principles.

6. Streamlined Dependency Injection (DI)

Angular 15 simplifies dependency injection (DI) with the provideIn property. This allows you to specify the provider scope (component, root, etc.) directly within the token, enhancing code readability.

7. Trying Out ESBuild Support (Experimental)

ESBuild, a JavaScript bundler, is now available as an experimental feature in Angular 15. This has the potential to significantly reduce build times, especially in larger projects.

8. Automatic Language Service Imports: Improved Development Experience

The Angular Language Service is getting smarter! In Angular 15, it can automatically suggest imports for directives, pipes, and components. This reduces boilerplate code and saves you valuable development time.

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Key Changes in Angular 15

Be aware that alongside the exciting new features in Angular 15, there are some important updates that could affect your existing applications. Let’s explore these changes to ensure a smooth transition.

Compatibility Updates: Angular 15 drops support for certain Node.js versions and requires TypeScript version 4.8 or later. Make sure your development environment reflects these updated requirements.
Animation Adjustments: The format for @keyframes rules has been tweaked to include the component’s scope name. This might necessitate adjustments in your existing TypeScript or JavaScript code that interacts with animations.
Dependency Injection Scrutiny: The compiler has become more vigilant with dependency injection. It will now flag errors when constructors inherited from base classes cause compatibility issues. Review your code to address any potential conflicts.
Router Outlet Refinement: The behavior of RouterOutlet has been refined. It now creates components after checking for changes. This might require adjustments to tests or production code that rely on the exact timing of component availability.

By understanding these key changes, you can prepare your applications for a seamless upgrade to Angular 15.

Deprecations in Angular 15

Heads Up! Some Features Are on Their Way Out

Angular 15 introduces deprecations for certain features, signaling their eventual removal in future versions. Here’s a breakdown of what’s changing:

DATE_PIPE_DEFAULT_TIMEZONE: This option is being superseded by DATE_PIPE_DEFAULT_OPTIONS. Within DATE_PIPE_DEFAULT_OPTIONS, the time zone is now defined using the timezone field.
Injector.get() with InjectFlags: This method is being deprecated in favor of using the InjectOptions object when calling Injector.get().
TestBed.inject() with InjectFlags: Similar to Injector.get(), TestBed.inject() also requires the new InjectOptions object instead of the InjectFlags parameter.
providedIn: NgModule for @Injectable and InjectionToken: The usage of providedIn: NgModule or providedIn: 'any' for @Injectable or InjectionToken is being discouraged. Consider using providedIn: 'root' instead. If you need scoping within a specific NgModule, use NgModule.providers instead.
RouterLinkWithHref Directive: This directive is being phased out. Its functionality is now fully incorporated into the RouterLink directive, so you can switch to using that instead.

Upgrade from Angular v14 to Angular v15

Before Upgrading:

Check Compatibility: Ensure you’re using supported versions of Node.js (14.20.x, 16.13.x, or 18.10.x) and TypeScript (version 4.8 or later) with your Angular project.

Upgrade Steps:

Navigate: Open a terminal or command prompt and navigate to your Angular application’s project directory.
Run Update Command: Execute the following command to upgrade your application to Angular v15:

ng update @angular/core@15 @angular/cli@15

Post-Upgrade Considerations:

Remove enableIvy: Since Ivy is the sole rendering engine in Angular v15, the enableIvy setting in your tsconfig.json is no longer necessary and can be removed.
Ensure ActivatedRouteSnapshot Titles: Verify that all ActivatedRouteSnapshot objects within your application possess a title property. This property is now mandatory in v15.
Router’s relativeLinkResolution: Be aware that relativeLinkResolution is no longer configurable in the v15 Router. This setting previously allowed opting out of a bug fix that is now the standard behavior.
Update TestBed.inject(): If you use the InjectFlags parameter with TestBed.inject(), update it to use the new InjectOptions parameter instead, as InjectFlags is deprecated in v15.
providedIn: 'any' Deprecation: Using providedIn: 'any' for @Injectable or InjectionToken is no longer recommended in v15.

After Updating:

Thorough Testing: Following the upgrade process, meticulously review your application and its interactions to guarantee everything functions as expected. Conduct comprehensive testing of all features and components to detect any regressions or unintended behavior.

Conclusion

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What’s New in Angular 15?

1. Standalone Components: Build Without Modules

2. Faster Images with Stable NgOptimizedImage

3. Directives for Host Elements: More Control

4. Improved Error Tracking with Enhanced Stack Traces

5. Stable Material Design Components (MDC)

6. Streamlined Dependency Injection (DI)

7. Trying Out ESBuild Support (Experimental)

8. Automatic Language Service Imports: Improved Development Experience

Key Changes in Angular 15

Deprecations in Angular 15

Upgrade from Angular v14 to Angular v15

Before Upgrading:

Upgrade Steps:

Post-Upgrade Considerations:

After Updating:

Conclusion

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