/**
 * A modern "chartEx" chart layout (`cx:series/@layoutId`, OOXML `ST_SeriesLayout`),
 * transliterated from ooxmlsdk `SeriesLayout`. These charts live in a separate
 * `chartEx{N}.xml` part (`cx:` namespace) referenced from the drawing, distinct
 * from the legacy `c:` charts authored via {@link ChartPatch}.
 *
 * `histogram` and `pareto` are authored as `clusteredColumn` / `paretoLine`
 * series under the hood; this enum collapses those to the user-facing layout.
 * All eight are renderer-visible in xlsx-preview.
 */
export type ChartExKind = "waterfall" | "funnel" | "treemap" | "sunburst" | "histogram" | "pareto" | "boxWhisker" | "regionMap";