/*! Copyright (c) 2018 Siemens AG. Licensed under the MIT License. */
import { Observable } from "rxjs";
import { Controller } from "..";
/**
 * A convenience controller that monitors the connection state (online or offline)
 * of the associated communication manager.
 */
export declare class ConnectionStateController extends Controller {
    /**
     * Gets a boolean observable that emits `true` if the
     * connection state of the associated communication manager
     * transitions to offline, and `false` if it transitions to
     * online. When subscribed, the current connection state is
     * emitted immediately.
     */
    get isOffline(): Observable<boolean>;
}