Resolving the global provider in Angular2 Typescript with the help of an Interface

In the realm of my Angular2 application, I have two essential services called WebStorageService and MobileStorageService, both of which impeccably implement an interface known as IStorageService. Interestingly, in my magnificent main.component, I elegantly bootstrap the app with the distinguished WebStorageService. However, in one of the components, a fascinating endeavor unfolds as I strive to acquire the provider within the constructor utilizing the following approach:

// main.component
bootstrap(AppComponent,[WebStorageService])  // WebStorageService flawlessly implements the esteemed IStorageService interface

//AppComponent
import {IStorageService} from "./IStorageService"

@Component
export class AppComponent {

  constructor(private _storage: IStorageService) { } <-- An error interrupts this harmonious establishment - Can't resolve all parameters for AppComponent

}

Ergo, dear comrades, I am compelled to inquire - is there by any chance a method that would allow me to provide the service employing the Interface as the illustrious type?

Answer №1

After consulting @rinukkusu's response, I ultimately decided to utilize angular2 opaque tokens.

// main.component
bootstrap(AppComponent,[{provide: customStorageService, {useClass: WebStorage} }])  

// defining customStorageService as an opaque token
export let customStorageService = new Token("IStorageService"); 

//AppComponent   
@Component
export class AppComponent {

  constructor(@Inject(customStorageService) _storage:IStorageService){}

}

Answer №2

Interfaces cannot be utilized for dependency injection. When the code is compiled, interface information gets stripped away, making it inaccessible during runtime. Interfaces serve the purpose of static analysis exclusively.

Answer №3

Include the service in your component:

 @Component({
   providers: [IDataService]})
    export class HomeComponent {

      constructor(private _data: IDataService) { } 

    }

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