import { Document, Schema } from "mongoose";
import HookErrorCallback from "../interfaces/HookErrorCallback";
export declare type RefValidationFuncOptions<T extends Document = any> = {
    /**
     * Error callback
     */
    errorCb?: HookErrorCallback;
};
/**
 * Ref validation
 * @param schema mongoose schem
 * @param options options
 */
export default function RefValidation<T extends Document = any>(schema: Schema<any>, options: RefValidationFuncOptions): void;