Registering Providers in Angular 6

@NgModule({
  providers: [SomeService]
})
export class AppModule {}

Now, in angular 6 there is no need to do that and you can use the new providedIn property of @Injectable decorator:

import { Injectable } from '@angular/core';
@Injectable({ providedIn: 'root', //provided in the root module }) 
export class SomeService { constructor() { } } 
//or if you need it in a different module, just add the module
import { Injectable } from '@angular/core'; 
import { MyModule } from './my.module'; 
@Injectable({ providedIn: MyModule, }) 
export class SomeService { constructor() { } }

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