Angular 6 service with interface

Question

I am building an application with Angular (6.0.7) and I am trying to create a service with the new:

@Injectable({
  providedIn: \'root\'
})
         


        

Answer 1

I think you can't use typescript interfaces for dependency injection as typescript interfaces don't exist at runtime (only for typesafety at compile time).
I would suggest using an abstract class for it.

EDIT: It seems you can use useClass in the first parameter of @Injectable, not as a second like your example. Combining that with @k0zakinio's answer results in:

@Injectable({
  providedIn: 'root',
  useClass: environment.concrete,
  deps: []
})
export abstract class SessionStorage { }

It also seems you need to declare your dependencies via deps or inject, checkout this github issue. I hope this time my answer is of more help.