export declare const isMobile: boolean;
export declare function removeUndefineds<T>(obj: T): T;
export declare function getDeviceInfo(): Promise<{
    audioInputDevices: MediaDeviceInfo[];
    videoInputDevices: MediaDeviceInfo[];
    audioOutputDevices: MediaDeviceInfo[];
    hasAudioInputDevices: boolean;
    hasVideoInputDevices: boolean;
}>;
export declare function isPermissionDenied(name: PermissionName): Promise<boolean>;