import { AbstractControl } from '@angular/forms';
/**
 * check time input has value.
 * valid examples:
 * 10:20:30 <- valid true
 * 10:20 <- valid true
 *
 * invalid examples:
 * 10:20:ss <- valid false
 * 1h:20:11 <- valid false
 * 1h:m0:11 <- valid false
 * 10:mm <- valid false
 */
export declare function validateRequiredTime(control: AbstractControl): {
    [key: string]: any;
} | null;
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