interface calculateStartIndexProps {
    top: number;
    itemHeight: number;
    curScrollPos: number;
    viewportSize: number;
}
interface calculateRenderIndexProps {
    startIndex: number;
    renderItemCount: number;
    itemCount: number;
    overscanCount?: number;
}
export declare const calculateStartIndex: ({ top, itemHeight, curScrollPos, viewportSize, }: calculateStartIndexProps) => number;
export declare const calculateRenderIndex: ({ startIndex, renderItemCount, itemCount, overscanCount, }: calculateRenderIndexProps) => {
    renderStartIndex: number;
    renderEndIndex: number;
};
export {};