/**
 * Utility to compute the exponential weighted moving average
 *
 * inspired by https://github.com/shaka-project/shaka-player/blob/eaadb52627f0a0347390b201866585cce91fe9d0/lib/abr/ewma.js
 */
export declare class EwmAverage {
    /**
     * Current average
     */
    average: number;
    private _alpha;
    private _estimate;
    private _totalWeight;
    /**
     * halflife is the time decay that holds half of the estimate value
     */
    constructor(halflife: number);
    /**
     * Add a sample {value}, {weight}
     * weight = time delta
     */
    add(value: number, weight: number): void;
    /**
     * Resets the rolling average (equivalent to 0 samples taken so far)
     */
    reset(): void;
}
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