import { ElementRef, OnInit, OnDestroy } from '@angular/core';
import { FetchMoreCallback } from '../../core/types';
export declare class LazyScrollDirective implements OnInit, OnDestroy {
    private el;
    items: any[];
    itemHeight: number;
    viewportHeight: number;
    bufferSize: number;
    fetchMore: FetchMoreCallback;
    visibleRangeChange: any;
    loadingChange: any;
    private engine;
    private scrollListener;
    constructor(el: ElementRef);
    ngOnInit(): void;
    ngOnDestroy(): void;
    private onScroll;
    refresh(): void;
    getVisibleRange(): import("../../core/types").VisibleRange;
}
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