The *ol/source/Delaunay* computes a
Delaunay triangulation
of a vector source (points).

Experimental this feature is still in progress and may be buggy.

NB: the algorithm is incremental and not very efficient but it computes the triangulation directly in a *ol/source/Vector*.

You can add/remove vertex from the point source and get the resulting triangles directly in the triangle source.

If you're looking for you'd better see an other algorithme like
mapbox/delaunator

This is more to use with interactive processes to maintains a triangulation on state while interacting.