/**
 * Attaches virtual scrolling to a table host.
 * Renders only a window of rows around the viewport using IntersectionObserver sentinel rows.
 */
export type VirtualTableOptions = {
    rowHeightPx?: number;
    bufferRows?: number;
};
export declare function attachVirtualTableScroll(tableHost: HTMLElement, allRows: string[][], headerRow: string[] | null, options?: VirtualTableOptions): () => void;
/** Extract rows from a SheetJS worksheet as string[][] */
export declare function sheetToRows(sheet: Record<string, unknown>, range?: {
    s: {
        r: number;
        c: number;
    };
    e: {
        r: number;
        c: number;
    };
}): string[][];
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