Rxjs error with pipe of operators

Question

I have an error in switchMap operator:

@Injectable()
export class AvailableStoreTypesLoadedEffect {
constructor(private actions$: Actions,
          private service: AvailableService) {

}

 @Effect()
 AvailableStoreTypesLoadedEffect$ = this.actions$
 .ofType(FETCH_AVAILABLE_STORE_TYPES)
 .pipe(
   switchMap(action => this.service.fetchAvailableStoreTypes()),//Error:(22, 9) TS2684:The 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'.
   map(res => new AvailableStoreTypesLoaded(res))
  );
}

I tried with:

Observable.of({})
  .pipe(
    switchMap(() => Observable.of({}))//Error:(22, 9) TS2684:The 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'.
  );

but I get the same error.

My environment is:

• angular 5.0.3
• typescript 2.4.2
• rxjs 5.5.2

Answer 1

I imported the library from import { mergeMap } from 'rxjs/operator/mergeMap'; but it must be imported from import { mergeMap } from 'rxjs/operators';