import type { ExportCellValue, ExportOptions } from 'apex-grid/internal';
/** Excel column letter for zero-based column index (0 → A, 26 → AA). */
export declare function columnLetter(index: number): string;
/**
 * Converts a `Date` to the Excel serial date number (days since the 1899-12-30
 * epoch, with the day rolling over at the user's local midnight). Time of day
 * is preserved as the fractional part.
 */
export declare function toExcelSerial(date: Date): number;
/** A worksheet representation passed to {@link buildXLSX}. */
export interface XLSXSheetData {
    /** Worksheet tab name. */
    name?: string;
    /** Header row labels (rendered with bold styling). */
    headers: string[];
    /** Data rows. Each row is an array of cell values, aligned to `headers`. */
    rows: ExportCellValue[][];
}
/**
 * Options for {@link ApexGridEnterprise.exportToXLSX}. Mirrors the community
 * grid's CSV options, plus an optional worksheet name.
 */
export interface XLSXExportOptions<T extends object> extends ExportOptions<T> {
    /** Worksheet tab name. Defaults to `'Sheet1'`. Trimmed to 31 chars. */
    sheetName?: string;
}
/**
 * Builds the complete `.xlsx` bytes for a single-sheet workbook.
 */
export declare function buildXLSX(sheet: XLSXSheetData): Uint8Array;