import { VirtualTypeOptions } from 'mongoose';
export declare const VIRTUAL_PROPS_KEY = "virtualProps";
export interface VirtualRefProps {
    populate?: boolean;
    excludeFields?: string[];
    maxDepth?: number;
    onDelete?: 'setNull' | 'cascade' | 'none';
}
export declare function VirtualProp(config?: VirtualTypeOptions & VirtualRefProps): (target: Object, propertyKey: string) => void;