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