import EnhancedEventEmitter from '../../EnhancedEventEmitter';
import Logger from '../Logger';
declare class System {
    #private;
    private readonly clientEventEmitter;
    isEnableVideoDevicesLock: boolean;
    isEnableAudioDevicesLock: boolean;
    isDevicesDetected: boolean;
    availableVideoDevices: MediaDeviceInfo[];
    availableAudioDevices: MediaDeviceInfo[];
    constructor(clientEventEmitter: EnhancedEventEmitter, loggerFactory: (namespace: string) => Logger);
    setIsEnableVideoDevicesLock(value: boolean): void;
    setIsEnableAudioDevicesLock(value: boolean): void;
    setAvailableVideoDevices(availableVideoDevices: MediaDeviceInfo[]): void;
    setAvailableAudioDevices(availableAudioDevices: MediaDeviceInfo[]): void;
    requestMediaDevicesAccess(constraints?: MediaStreamConstraints): Promise<MediaStreamTrack[]>;
    hasAvailableMediaDevicesList(): Promise<boolean>;
    refreshAvailableMediaDevicesList(): Promise<MediaDeviceInfo[]>;
    detectDevices(force?: boolean): Promise<void>;
    deviceChangeHandler(): Promise<void>;
    listenDevices(): void;
    private assertHasAccessToMediaDevices;
    private tryToAccessDevices;
}
export default System;