import { KitNgControlDirective } from './kit-ng-control/kit-ng-control.directive';
/**
 * ### Example
 *
 * * collection:form - [sources](https://github.com/ngx-kit/ngx-kit/tree/master/packages/collection/lib/ui-form),
 * [demo](https://ngx-kit.com/collection/module/ui-form)
 */
export declare class KitFormFieldService {
    private _controls;
    readonly control: KitNgControlDirective;
    readonly controls: KitNgControlDirective[];
    /**
     * Register KitNgControlDirective in the service.
     */
    add(control: KitNgControlDirective): void;
    remove(control: KitNgControlDirective): void;
    /**
     * Check if error exists.
     */
    hasError(name: string): boolean;
    /**
     * Has any error and control touched or dirty.
     */
    getErrorsToDisplay(): string[];
    /**
     * Is main control required.
     */
    isRequired(): boolean;
}