Benefits of providedIn
- Tree-shakable: When Angular’s build optimizer uses providedIn, it can eliminate a service that isn’t needed in any part of the application. This contributes to a smaller bundle size, which speeds up loading times.
- Lazy loading optimization: Angular will generate a distinct instance of a service for every lazy-loaded module when the service is offered in a particular module. By doing this, encapsulation is maintained and conflicts are avoided and each module is guaranteed to receive its own instance.
- Easier to manage: It is simpler to comprehend where a service is provided and how it functions within an application when the scope of the service is clearly stated.
- Circular dependencies: When working with services that have circular dependencies, exercise caution—especially when offering root-level services. Circular dependencies can cause problems during runtime and complicate debugging the application.
- Accidental multiple instances: Offering a service at the component or lazy-loaded module level could unintentionally result in the creation of several instances of the service. When using providedIn, make sure you are aware of the ramifications of the scope you select.
What are providedIn strings in Angular?
Angular’s dependency injection (DI) system is a powerful feature that provides the management of application-wide services. Among these, providedIn stands out as a concise and efficient way to specify where and how services should be injected within an Angular application. In this article, we’ll see more about providedIn and explore its usage scenarios.