import { ElementRef, OnInit, Renderer2, OnDestroy } from '@angular/core';
import { ScrollSpyService } from './scroll-spy.service';
import * as i0 from "@angular/core";
export declare class SpyTargetDirective implements OnInit, OnDestroy {
    private el;
    private spyService;
    private renderer;
    spyTarget: string;
    constructor(el: ElementRef, spyService: ScrollSpyService, renderer: Renderer2);
    ngOnInit(): void;
    private get htmlElement();
    ngOnDestroy(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SpyTargetDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<SpyTargetDirective, "[spyTarget]", never, { "spyTarget": "spyTarget"; }, {}, never, never, false>;
}