export function isMediaPlaying(media: any): boolean;
export function getVideoPlaybackQuality(video: any): {
    droppedVideoFrames?: undefined;
    totalVideoFrames?: undefined;
    creationTime?: undefined;
} | {
    droppedVideoFrames: any;
    totalVideoFrames: any;
    creationTime: any;
};
/**
 * @param {Array.<Uint8Array>} arr
 * @returns
 */
export function concatUint8Array(...arr: Array<Uint8Array>): Uint8Array;
export function sleep(t?: number): Promise<any>;