运算符管道的Rxjs错误

Question

我在switchMap运算符中有错误:

@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))
  );
}

我尝试过:

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<{}>'.
  );

但我得到了同样的错误.

我的环境是:

• 角5.0.3
• 打字稿2.4.2
• rxjs 5.5.2

Answer 1

我从中导入了库,import { mergeMap } from 'rxjs/operator/mergeMap';但必须从中导入import { mergeMap } from 'rxjs/operators';