import React from 'react';
export declare type VirtualScrollY = {
    height: number;
    itemHeight: number;
};
export default function useVirtualScrollY(itemLength: number, virtualScroll?: VirtualScrollY): {
    handleScroll: (e: React.UIEvent<HTMLDivElement, UIEvent>) => void;
    startShow: number;
    endShow: number | undefined;
    wrapperStyle: React.CSSProperties;
    itemsStyle: React.CSSProperties;
};