import { ElementRef, EventEmitter, Renderer2 } from '@angular/core';
export declare class VirtualScrollDirective {
    private el;
    private renderer;
    private _totalCount;
    top: HTMLElement;
    bottom: HTMLElement;
    scrollOffset: number;
    itemHeight: number;
    set totalCount(count: number);
    get totalCount(): number;
    rangeChanged: EventEmitter<any>;
    private scrollTimer;
    private lastScrollFireTime;
    constructor(el: ElementRef, renderer: Renderer2);
    reset(): void;
    throttleScroll(target: any): void;
    onscroll({ target }: Event): void;
    initialSetup(): void;
}