import type { SelectQueryBuilder } from "../../query-builder/SelectQueryBuilder";
/**
 * Special decorator used to extract relation id into separate entity property.
 * @param relation
 * @param alias
 * @param queryBuilderFactory
 * @experimental
 */
export declare function RelationId<T>(relation: string | ((object: T) => any), alias?: string, queryBuilderFactory?: (qb: SelectQueryBuilder<any>) => SelectQueryBuilder<any>): PropertyDecorator;
