import { NgControl } from '@angular/forms';
/**
 * @see https://netbasal.com/disabling-form-controls-when-working-with-reactive-forms-in-angular-549dd7b42110
 *
 * TODO: this only works if "required" is the only validator
 * Angular currently has no getValidators API
 */
export declare class RxfRequiredDirective {
    private ngControl;
    libRxfRequired: boolean;
    /** ctor */
    constructor(ngControl: NgControl);
}