/** Colours (`#RRGGBB`) for the bold header row. */
export interface XlsxHeaderColors {
    fill: string;
    text: string;
}
/**
 * Build the `.xlsx` for a data table: one sheet, a bold header row on a filled
 * background, then one row per record. Pure: no DOM, no grid. The workbook
 * library is dynamic-imported so it stays out of a consumer's main bundle
 * until someone exports.
 */
export declare function buildDataTableXlsx(headers: readonly string[], rows: readonly (readonly unknown[])[], colors: XlsxHeaderColors): Promise<Blob>;
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