import { StaticProvider } from '@angular/core';
import { AbstractControl, RequiredValidator as NgRequiredValidator, ValidationErrors } from '@angular/forms';
import * as i0 from "@angular/core";
export declare const REQUIRED_VALIDATOR: StaticProvider;
export declare class RequiredValidator extends NgRequiredValidator {
    validate(control: AbstractControl): ValidationErrors | null;
    static ɵfac: i0.ɵɵFactoryDeclaration<RequiredValidator, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<RequiredValidator, ":not([type=checkbox])[required][ngxAccessor]", never, {}, {}, never, never, true, never>;
}