John

component.ts

private store: Store<AprState>
apr$: Observable<AprViewModel>;

//replace snippet
this.apr$ = this.store.pipe(select(fromAprSelectors.selectedApr));

selector.ts

export interface AprViewModel {
  apr: string;
  aprid: string;
}
export const selectedApr = createSelector(
selectAprState,
 (state: yourReducer.yourreducerstatename):AprViewModel => {
    return {
      apr: state.selectedApr,
      aprId: state.selectedAprId
     }
  }
);