import { NgZone } from '@angular/core';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * @author mscharf
 */
export declare class TerraLoadingSpinnerService {
    private zone;
    private isRootWindow;
    observable: Observable<boolean>;
    private _isLoading;
    private subscriber;
    constructor(zone: NgZone, isRootWindow: boolean);
    start(): void;
    stop(): void;
    get isLoading(): boolean;
    private runOutsideAngular;
    private notify;
    static ɵfac: i0.ɵɵFactoryDeclaration<TerraLoadingSpinnerService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TerraLoadingSpinnerService>;
}