import { ChangeDetectorRef, Injector } from '@angular/core';
import { AbstractControl } from '@angular/forms';
import { Observable } from 'rxjs';
/**
 * Mirrors the touched state of the control bound to this component (formControlName /
 * formControl / ngModel) onto an internal control, so a parent `markAllAsTouched()` shows
 * validation errors inside the picker and a form reset clears them.
 *
 * Call from ngAfterContentInit: by then formControlName has set up its control, and the
 * component's own view has not been checked yet.
 */
export declare function syncTouchedState(injector: Injector, target: AbstractControl, changeDetectorRef: ChangeDetectorRef, destroy$: Observable<void>): void;