How does declaring a service in a component differ when done as a provider versus in the constructor?
When declared as a provider:
@Component({
...
providers: [MyService]})
Versus being declared in the constructor:
constructor(private myService: MyService) {
...
}
Is there a recommended approach between the two methods?
At the component level, registering a provider results in a new instance of the service being created with each new instance of that component.
However, when you provide the service at the root level, Angular generates a single shared instance of MyService and injects it into any requesting class.
Including the provider in the @Injectable() metadata also enables Angular to optimize the application by excluding the service from the compiled app if not used.
@Injectable({ providedIn: 'root' })
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