import { MediaPermissions, MediaPermissionState, MediaPermissionType, PermissionChangeCallback } from './permissions.types';

export declare class PermissionsService {
    private permissionStatuses;
    private callbacks;
    private changeHandlers;
    constructor();
    checkPermission(type: MediaPermissionType): Promise<MediaPermissionState>;
    checkAll(): Promise<MediaPermissions>;
    requestPermission(type: MediaPermissionType): Promise<boolean>;
    requestAll(): Promise<{
        camera: boolean;
        microphone: boolean;
    }>;
    onPermissionChange(type: MediaPermissionType, callback: PermissionChangeCallback): VoidFunction;
    private setupChangeListener;
    private checkPermissionViaDevices;
    destroy(): void;
}