import { HttpClient } from '@angular/common/http';
import { NgZone } from '@angular/core';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class NgConnectionMonitorService {
    private http;
    private ngZone;
    private readonly onlineStatus$;
    private readonly pingInterval;
    private pingUrl;
    constructor(http: HttpClient, ngZone: NgZone);
    get isOnline$(): Observable<boolean>;
    private monitorNetworkStatus;
    private pingBackend;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgConnectionMonitorService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgConnectionMonitorService>;
}