type Device = 'camera' | 'microphone';
type PermissionStatusState = typeof PermissionStatus.prototype.state;
type EventListener = (name: Device, state: PermissionStatusState) => void;
export declare class NavigatorPermissions {
    private _cameraPermissionStatus;
    private _microphonePermissionStatus;
    private _listener;
    static isSupported(): boolean;
    init(listener: EventListener): Promise<void>;
    private handlePermissionChange;
    getPermissionState(device: Device): PermissionState | null;
}
export {};