import { Any, AnyObject, Options } from "../../types";
import { WindowOperatorInput } from "./_internal";
/**
 * Returns the exponential moving average of numeric expressions applied to documents
 * in a partition defined in the $setWindowFields stage.
 */
export declare const $expMovingAvg: (_: AnyObject, coll: AnyObject[], expr: WindowOperatorInput, options: Options) => Any;