Modular Service / Provider in Angular

category.component.ts

@Component()
export class CategoryComponent {
  constructor(@Inject("ShopCategoryProvider") public shopCategoryProvider) {
    shopCategoryProvider.getCategories().subscribe(response=>{
      // Do stuff with data
    });
  }

IShopCategoryProvider.ts

export interface IShopCategoryProvider {
  getCategories(): Observable<any>;
}

provider.factory.ts

export let shopCategoryFactory = (networkHelper: NetworkHelper, returnService1:boolean): IShopCategoryProvider => {
  if(returnService1)    
    return new ShopCategoryProvider1(networkHelper);
  } else {  
    return new ShopCategoryProvider2(networkHelper);
  }
};

ProvidersModule.ts

@NgModule({
    imports: [NetworkModule],
    providers: [
        {
            provide: "ShopCategoryProvider",
            useFactory: shopCategoryFactory,
            deps: [NetworkHelper,true],
            multi: false
        }
    ]
})
export class ProvidersModule { }

ShopCategoryProvider1.ts

@Injectable()
export class ShopCategoryProvider1 implements IShopCategoryProvider {

  constructor(private networkHelper: NetworkHelper) {
  }

  getCategories(): Observable<any> {
    // Do some stuff and return data
    return Observable.empty();
  }

}

ShopCategoryProvider2

@Injectable()
export class ShopCategoryProvider2 implements IShopCategoryProvider {

  constructor(private networkHelper: NetworkHelper) {
  }

  getCategories(): Observable<any> {
    // Do some stuff and return data
    return Observable.empty();
  }

}