export declare const AUDIO_TRACK_CONSTRAINTS: MediaTrackConstraints;
export declare const VIDEO_TRACK_CONSTRAINTS: MediaTrackConstraints;
export declare const SCREEN_SHARING_MEDIA_CONSTRAINTS: MediaStreamConstraints;
export declare const prepareMediaTrackConstraints: (deviceId: string | undefined, constraints: MediaTrackConstraints | undefined | boolean) => MediaTrackConstraints | boolean;
export declare const prepareConstraints: (deviceIdToStart: string | undefined, constraints: MediaTrackConstraints | undefined | boolean) => MediaTrackConstraints | undefined | boolean;
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