This documentation is for OpenLayers v5.3.2. The latest is v.
ol/geom/GeometryLayout
Members
GeometryLayout{string}
The coordinate layout for geometries, indicating whether a 3rd or 4th z ('Z')
or measure ('M') coordinate is available. Supported values are 'XY',
'XYZ', 'XYM', 'XYZM'.