Reads the geometry types actually present in the data.
Unlike detectGeometryTypes, it answers an EMPTY set when the data shows none — no
feature, or features without a geometry — instead of assuming the three families. A caller
that must tell "shows nothing" from "shows everything" reads this one.
Parameters
data: unknown
The GeoJSON to scan: a collection, or a single feature.
Returns Set<string>
The geometry types found. Empty when there are none.
Reads the geometry types actually present in the data.
Unlike detectGeometryTypes, it answers an EMPTY set when the data shows none — no feature, or features without a geometry — instead of assuming the three families. A caller that must tell "shows nothing" from "shows everything" reads this one.