import { ElementRef, EventEmitter } from '@angular/core';
import * as i0 from "@angular/core";
export declare class ScrollSpyDirective {
    private _el;
    spiedTags: Array<string>;
    querySelector: string;
    sectionChange: EventEmitter<string>;
    private currentSection;
    constructor(_el: ElementRef);
    onScroll(event: any): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<ScrollSpyDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ScrollSpyDirective, "[scrollSpy]", never, { "spiedTags": { "alias": "spiedTags"; "required": false; }; "querySelector": { "alias": "querySelector"; "required": false; }; }, { "sectionChange": "sectionChange"; }, never, never, false, never>;
}