import { ParticipantId } from '../../types/Participant';
import { StatItem, StatRtp, StatTransport } from '../../types/Statistics';
export declare const NO_STAT_REQUEST_DELAY = 1000;
declare function distinctById(items: RTCStats[]): RTCStats[];
declare function rtcStatsToArray(stats: RTCStatsReport[]): RTCStats[];
/**
 * Extracts transport statistics from the gives stats
 * @hidden
 */
declare function extractTransport(stats: RTCStats[]): StatTransport;
/**
 * Extracts media statistics from the given stats
 * @hidden
 */
declare function extractRtps(stats: RTCStats[], ssrcMap: Record<string, string>, needToExtractRemote?: boolean): StatRtp[];
/**
 * Computes delta (the difference) between two stat reports.
 * @hidden
 */
declare function delta(current: StatItem, previous: StatItem, needToExtractRemote?: boolean): StatItem;
declare function collectStats(pc: RTCPeerConnection, previous: StatItem | null, ssrcMap?: Record<string, string>, needToExtractRemote?: boolean): Promise<StatItem>;
declare function setMark(name: string): void;
declare function clearMark(name: string): void;
declare function measureMark(name: string): null | number;
declare function getMarkNameScreenshareFirstFrame(uid: ParticipantId): string;
declare const _default: {
    distinctById: typeof distinctById;
    rtcStatsToArray: typeof rtcStatsToArray;
    extractTransport: typeof extractTransport;
    extractRtps: typeof extractRtps;
    delta: typeof delta;
    collectStats: typeof collectStats;
    setMark: typeof setMark;
    clearMark: typeof clearMark;
    measureMark: typeof measureMark;
    getMarkNameScreenshareFirstFrame: typeof getMarkNameScreenshareFirstFrame;
};
export default _default;