/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the Microsoft Live Share SDK License.
 */
import EventEmitter from "events";
import { GroupPlaybackTrack } from "./GroupPlaybackTrack";
import { ExtendedMediaSessionActionSource } from "../MediaSessionExtensions";
import { IGroupStateEvent } from "./interfaces";
/**
 * @hidden
 */
export interface IPlaybackTrackData {
    data: object | null;
    timestamp: number;
    clientId: string;
}
/**
 * @hidden
 */
export declare enum PlaybackTrackDataEvents {
    dataChange = "dataChange"
}
/**
 * @hidden
 */
export interface IPlaybackTrackDataChangeEvent extends IGroupStateEvent {
    data: object | null;
}
/**
 * @hidden
 */
export declare class GroupPlaybackTrackData extends EventEmitter {
    private _track;
    private _current;
    constructor(track: GroupPlaybackTrack);
    get current(): Readonly<IPlaybackTrackData>;
    get data(): object | null;
    updateData(trackData: IPlaybackTrackData, source: ExtendedMediaSessionActionSource): boolean;
}
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