AsUnion

AsUnion returns a [CustomChartsSectionChartsSingleCustomChartResponseSerializedSeriesGroupByDefinitionsUnion] interface which you can cast to the specific types for more type safety.

Possible runtime types of the union are [CustomChartsSectionChartsSingleCustomChartResponseSerializedSeriesGroupByDefinitionsCustomChartGroupByPlain], [CustomChartsSectionChartsSingleCustomChartResponseSerializedSeriesGroupByDefinitionsCustomChartGroupByComplex].