import { DeviceReturnType } from "./types";
export declare const isGranted: (mediaDeviceInfo: MediaDeviceInfo) => boolean;
export declare const isNotGranted: (mediaDeviceInfo: MediaDeviceInfo) => boolean;
export declare const isVideo: (it: MediaDeviceInfo) => boolean;
export declare const isAudio: (it: MediaDeviceInfo) => boolean;
export declare const toMediaTrackConstraints: (constraint?: boolean | MediaTrackConstraints) => MediaTrackConstraints | undefined;
export declare const prepareReturn: (isInterested: boolean, mediaDeviceInfo: MediaDeviceInfo[], permissionError: string | null) => DeviceReturnType;
export declare const NOOP: () => void;
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