import { FormGroup } from '@angular/forms';
/**
 * WARNING: Add in array, and will overwrite original formControls Validator(s)
 * @param extraValidators new array of Validators in form of equal to the original formGroup
 * @param path optional parameter, because recursivity, no need to add initially
 */
export declare function setValidators(formGroup: FormGroup, extraValidators: any, path?: string): FormGroup;