import { Validator, ValidatorFn, AbstractControl } from '@angular/forms';
export declare class CpfValidatorDirective implements Validator {
    private validator;
    private _onChange;
    validation: ValidatorFn | null;
    constructor();
    validate(c: AbstractControl): {
        [key: string]: any;
    };
    private cpfValidator();
    registerOnValidatorChange(fn: () => void): void;
}