import { type IndependentValidationRule, type ValidationRule } from '../core';
/**
 * Выключает проверку на required в guard
 * @example object({ name: optional(string(min(22))) })
 */
export declare const optional: <TLastSchemaValues extends Record<string, unknown>>(rule: ValidationRule<unknown, TLastSchemaValues>) => IndependentValidationRule<unknown, TLastSchemaValues>;