import { ValidationErrors } from '@angular/forms';
import { ConfigType } from 'dayjs';
/**
 * check if given time is valid time.
 * in case time is undefined, null, '' or moment return isValid the function return null which indicate valid.
 *
 * @param time
 */
export declare function isValidTime(time: string): ValidationErrors | null;
/**
 * get time and add to it minutes
 * @param time
 * @param minutes
 */
export declare function addMinutes(time: ConfigType, minutes: number): string;
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