import { DocumentWriter, WriteResult } from '../core/ir/adapters.js';
import { SheetDoc } from '../core/ir/sheet.js';
/**
 * Serialize a {@link SheetDoc} back to a `.xlsx` (E-SHEET SD1). The first writer
 * that consumes the SpreadsheetML IR node directly (not the FlowDoc projection),
 * so the cells keep their RAW value + style index and the SheetDoc is a stable
 * round-trip fixpoint (SD2). Re-emits the full grid surface — values, shared
 * strings, styles, merges, column/row geometry, the page model, conditional
 * formatting, sparklines, table parts and embedded charts — through the core OPC
 * writer.
 *
 * @param sheet The spreadsheet IR tree to write.
 * @returns The encoded `.xlsx` bytes and any write-time losses (e.g. a chart
 *   frame whose data could not be resolved).
 */
export declare function writeXlsx(sheet: SheetDoc): WriteResult;
/** The `.xlsx` {@link DocumentWriter}: a thin wrapper over {@link writeXlsx}. */
export declare const xlsxWriter: DocumentWriter<SheetDoc>;