import { CameraController } from '../media-stream/controllers/camera.controller';
import { MicrophoneController } from '../media-stream/controllers/microphone.controller';
import { AudioOutputController } from '../media-stream/controllers/audio-output.controller';
import { PermissionsService } from '../permissions/permissions.service';
import { DiagnosticsReport, DiagnosticsRunOptions, DiagnosticsStepCallback } from './diagnostics.types';

export declare class DiagnosticsService {
    private permissions;
    private camera;
    private microphone;
    private audioOutput;
    private stepCallbacks;
    constructor(permissions: PermissionsService, camera: CameraController, microphone: MicrophoneController, audioOutput: AudioOutputController);
    run(options?: DiagnosticsRunOptions): Promise<DiagnosticsReport>;
    onStep(callback: DiagnosticsStepCallback): VoidFunction;
    destroy(): void;
    private checkBrowser;
    private checkCamera;
    private checkMicrophone;
    private checkSpeaker;
    private measurePeakVolume;
    private emitStep;
    private errorMessage;
}