import { TReferenceProps } from '../../..';
import { IBooleanProps, TBooleanValidatorResult } from '../_types';
export interface IIsRequiredProps {
}
/**
 * Check if the `boolean` is defined.
 */
export declare const isRequired: (props?: TReferenceProps<IIsRequiredProps> & IBooleanProps) => TBooleanValidatorResult;