import { OnDestroy } from '@angular/core';
import { Observable } from 'rxjs';
import { SpyTarget } from './models/spy-target';
import { SpyTargetIsIntersectingEvent } from './models/spy-target-is-intersecting-event';
import * as i0 from "@angular/core";
/**
 * Scroll spy service.
 *
 * Creates a scroll-spy on the Document/Body per default and destroys it when the service is destroyed.
 *
 * Allows you to create (and destroy) scroll-spy on a scroll-container (any scrollable element).
 */
export declare class ScrollSpyService implements OnDestroy {
    private platformId;
    /**
     * Default scroll-spy on the default scroll element (Document/Body).
     */
    private readonly defaultScrollSpy;
    /**
     * Map containing created scroll-spies (on any scrollable elements).
     *
     * @key scrollContainerId
     * @value ScrollSpy
     */
    private readonly scrollSpies;
    constructor(platformId: string);
    ngOnDestroy(): void;
    /**
     * Create a scroll-spy for the provided `scrollContainer`.
     */
    createScrollSpy(scrollContainerId: string, scrollContainer: Element): void;
    /**
     * Destroy the scroll-spy with ID equals the provided `scrollContainerId`.
     */
    destroyScrollSpy(scrollContainerId: string): void;
    /**
     * Get the `spyTargetIsIntersecting$` observable for the provided `scrollContainerId`,
     *
     * Or the `spyTargetIsIntersecting$` of the `defaultScrollSpy` when `scrollContainerId` is `undefined`.
     */
    getSpyTargetIsIntersecting$(scrollContainerId?: string): Observable<SpyTargetIsIntersectingEvent>;
    /**
     * Adds a spy-target and starts to observe that target.
     */
    addTarget(spyTarget: SpyTarget): void;
    /**
     * Removes a spy-target and stops observing that target.
     */
    removeTarget(spyTarget: SpyTarget): void;
    /**
     * Get the scroll-spy for the proivded `scrollContainerId`.
     *
     * When `scrollContainerId` is `undefined` the `defaultScrollSpy` is returned.
     */
    private getScrollSpy;
    static ɵfac: i0.ɵɵFactoryDeclaration<ScrollSpyService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ScrollSpyService>;
}