/**
 * Excel Format Handler
 * Reads and writes Excel files (.xlsx, .xls, .xlsm)
 * Preserves formulas, supports multiple sheets
 */
export interface ExcelReadOptions {
    sheet?: string | number;
    range?: string;
    includeFormulas?: boolean;
}
export interface ExcelWriteOptions {
    sheet?: string;
    overwrite?: boolean;
}
export interface ExcelSheetInfo {
    name: string;
    rowCount: number;
    colCount: number;
    index: number;
}
/**
 * Read Excel file and return as 2D array
 */
export declare function readExcel(filePath: string, options?: ExcelReadOptions): Promise<any[][]>;
/**
 * Write 2D array to Excel file
 */
export declare function writeExcel(filePath: string, data: any[][] | {
    [sheetName: string]: any[][];
}, options?: ExcelWriteOptions): Promise<void>;
/**
 * Get metadata about Excel file (sheet names, sizes)
 */
export declare function getExcelInfo(filePath: string): Promise<{
    sheets: ExcelSheetInfo[];
    fileName: string;
}>;
/**
 * Convert column number to letter (1=A, 2=B, ..., 26=Z, 27=AA)
 */
export declare function columnNumberToLetter(num: number): string;
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