import { ValidatorFn } from '@angular/forms';
export declare class TimeValidator {
    static readonly FORMAT = "hh:mm";
    /**
     * Allow to control if time interval limits are well formed : the end limit should be 'older' the start limit
     * @param start: the field name where to find the start limit value
     * @param end: the field name where to find the end limit value
     */
    static greaterThanValidator(start: string, end: string): ValidatorFn;
    static RangePeriodValidator(): ValidatorFn;
}