import { OnChanges, SimpleChanges } from "@angular/core";
import { Validator, ValidatorFn, AbstractControl } from "@angular/forms";
export declare class DateValidatorDirective implements Validator, OnChanges {
    dateValidator: string;
    private valFn;
    ngOnChanges(changes: SimpleChanges): void;
    validate(control: AbstractControl): {
        [key: string]: any;
    };
}
export declare function dateValidator(): ValidatorFn;