cluster property
An option to optimize treemap series rendering by grouping smaller leaf
nodes below a certain square area threshold in pixels. If the square area
of a point becomes smaller than the specified threshold, determined by
the pixelWidth and/or pixelHeight options, then this point is moved
into one group point per series.
API Docs: https://api.highcharts.com/highcharts/series.treemap.cluster
Implementation
HighchartsTreemapSeriesClusterOptions? cluster;