import type { ChartExcelExtractor } from "./types.js";
/**
 * Sankey is a graph, so it has no one-row-per-point form and is the only series type
 * emitting two tables: its nodes and its links.
 *
 * After defaultizing, d3-sankey has replaced the link `source` and `target` ids with
 * references to the node objects, so the ids have to be read back off those.
 *
 * The sankey series has no `label` prop, so the `series` column is always the series id.
 */
export declare const sankeyExtractor: ChartExcelExtractor<'sankey'>;