export type CellValue = string | number | null | undefined;
/** Build a single-sheet .xlsx workbook from headers + rows. */
export declare function buildXlsx(sheetName: string, headers: string[], rows: CellValue[][]): Buffer;
/** 0 → A, 25 → Z, 26 → AA, … */
export declare function colRef(index: number): string;
/** Standard CRC-32 (exported for tests). */
export declare function crc32(buf: Buffer): number;
//# sourceMappingURL=xlsx.d.ts.map