import { PipelineOperator } from "../../core";
/**
 * Groups documents into windows and applies one or more operators to the documents in each window.
 *
 * See {@link https://www.mongodb.com/docs/manual/reference/operator/aggregation/setWindowFields/ usage}.
 *
 * @param collection
 * @param expr
 * @param options
 * @returns
 */
export declare const $setWindowFields: PipelineOperator;