@Directive({
   selector: '[tuiHintContent]'
})
export class TuiHintControllerDirective {
   @Input('tuiHintContent')
   content: PolymorpheusContent = ’’;
   @Input('tuiHintDirection')
   direction: TuiDirection = 'bottom-left';
   @Input('tuiHintMode')
   mode: TuiHintMode | null = null;
}

export abstract class Controller implements OnChanges {
   readonly change$ = new Subject<void>();
   ngOnChanges() {
       this.change$.next();
   }
}

@Directive({
   selector: '[tuiHintContent]'
})
export class TuiHintControllerDirective extends Controller {
    // ...
}

constructor(
  @Inject(ChangeDetectorRef) private readonly changeDetectorRef: ChangeDetectorRef,
  @Optional()
  @Inject(TuiHintControllerDirective)
  readonly hintController: TuiHintControllerDirective | null,
) {
  if (!hintController) {
    return;
  }
  hintController.change$.pipe(takeUntil(this.destroy$)).subscribe(() => {
    changeDetectorRef.markForCheck();
  });
}

constructor(
  @Inject(TUI_HINT_WATCHED_CONTROLLER)
  readonly hintController: TuiHintControllerDirective,
) {}

export const TUI_HINT_WATCHED_CONTROLLER = new InjectionToken('watched hint controller');
export const HINT_CONTROLLER_PROVIDER: Provider = [
   TuiDestroyService,
   {
       provide: TUI_HINT_WATCHED_CONTROLLER,
       deps: [[new Optional(), TuiHintControllerDirective], ChangeDetectorRef, TuiDestroyService],
       useFactory: hintWatchedControllerFactory,
   },
];
export function hintWatchedControllerFactory(
   controller: TuiHintControllerDirective | null,
   changeDetectorRef: ChangeDetectorRef,
   destroy$: Observable<void>,
): Controller {
  if (!controller) {
     return new TuiHintControllerDirective();
  }
   controller.change$.pipe(takeUntil(destroy$)).subscribe(() => {
      changeDetectorRef.markForCheck();
   });
   return controller;
}

@Component({
   //...
   providers: [HINT_CONTROLLER_PROVIDER],
})
export class TuiPrimitiveTextfieldComponent {
   constructor(
       //...
       @Inject(TUI_HINT_WATCHED_CONTROLLER)
       readonly hintController: TuiHintControllerDirective,
   ) {}
}