import { Chart } from '../document-model/index.js';
/**
 * Serialize a {@link Chart} to a DrawingML chart part (chart1.xml) — the inverse
 * of `parseChart`. Emits exactly the cached data the parser reads
 * (`c:numCache` / `c:strCache`), so a parse → serialize → parse round-trip
 * preserves type, series, categories, colours, title, legend and axis titles.
 * Pie/doughnut charts omit axes; scatter emits two value axes (`c:valAx`);
 * everything else gets a category + value axis pair. Shared by the xlsx writer
 * (embedded charts, WT1) and the docx writer (drawing charts, WT3).
 *
 * @param chart The chart to serialize.
 * @returns The chart1.xml document as a string (with the XML declaration).
 */
export declare function chartSpaceXml(chart: Chart): string;