We have a web GIS project that would be best served with the ability to edit topologies. As far as I can tell, this is still not possible with the ArcGIS API for JavaScript nor the ArcGIS REST API? Am I missing something obvious?
What we are looking for is something similar to: https://github.com/UW-Macrostrat/Leaflet.draw.topology
Also in API v4.x there's still no way to do that. We really appreciate of that's coming.