import { AbstractControl } from "@angular/forms";
/**
 * Checks whether given form has a field that should be visually marked as invalid.
 * Form is not in an error state if it's untouched even if it's invalid at that moment,
 * a user must first interact with the form before it can be considered as invalid.
 * 'invalid' form property should not be used for the purpose of this function,
 * it can be affected by its children form statuses, which can be considered as valid (untouched).
 *
 * @param parent
 */
export declare function hasControlInErrorState(parent: AbstractControl): boolean;