An extension of VerticalLayout that additionally has a Map. This object is returned by SODA’s default layout functions, and the Map is used to build the row() callback.
row: GlyphCallback <Annotation, Chart <any>, number>
This callback is used by default to place a glyph in a Chart’s row.
This value is used by default to set the height of a Chart to display the required number of rows.
rowMap: Map <string, number>