How providedIn Works ?
Consider a typical scenario where you have a service in your Angular application. Here’s how you would typically provide it:
@Injectable({
providedIn: 'root'
})
export class MyService {
// Service logic here
}
In this example, providedIn: ‘root’ indicates that Angular should provide this service at the root level of the application. This means that the service is available throughout the entire application. Angular will instantiate the service once and share the same instance across all the components that inject it.
Alternatively, you can provide the service in a specific module. For example:
@Injectable({
providedIn: SomeModule
})
export class MyService {
// Service logic here
}
The module where you wish to offer the service is indicated by the term “SomeModule” in this instance. For every module that imports the service, Angular will generate a unique instance of the service.
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.