import { HMSAudioTrackSettings, HMSVideoTrackSettings } from '../media/settings';
export declare function getAudioTrack(settings: HMSAudioTrackSettings): Promise<MediaStreamTrack>;
export declare function getVideoTrack(settings: HMSVideoTrackSettings): Promise<MediaStreamTrack>;
export declare function isEmptyTrack(track: MediaStreamTrack): boolean;
export declare const listenToPermissionChange: (permissionName: 'camera' | 'microphone', onChange: (state: PermissionState) => any) => void;