import { OnDestroy } from '@angular/core';
import { Observable } from 'rxjs';
import { ToggleSubject } from '@rxap/rxjs';
import * as i0 from "@angular/core";
export declare class WindowInstanceService implements OnDestroy {
    readonly loading$: ToggleSubject;
    private readonly _attachedLoadingSubscription;
    attachLoading(loading$: Observable<any>): void;
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<WindowInstanceService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<WindowInstanceService>;
}
