/**
 * XLSX codec — minimal OOXML SpreadsheetML reader/writer.
 * Documented subset (see ARCHITECTURE.md §3.4): cell values (string/number/
 * boolean), multiple sheets, sheet names. NOT supported yet: styles, merged
 * cells, formulas-in-file (formulas are exported as their last computed
 * value), charts, comments. Uses inline strings (t="inlineStr") rather than
 * a shared-strings table, trading a slightly larger file for a much simpler
 * — and therefore more auditable — writer.
 */
import { Workbook } from '../core/model.js';
import { ReadZipOptions } from './zip.js';
import { ImportResult } from './csv.js';
export declare function encodeXlsx(workbook: Workbook): Buffer;
export declare function decodeXlsx(buf: Buffer, opts?: ReadZipOptions): ImportResult;