In the Github issue linked by z77dj3kl I found a link to this vector port by ESRI : http://esri.maps.arcgis.com/apps/View/index.html?appid=d6b18a2e774c4959ba85

In the Github issue linked by z77dj3kl I found a link to this vector port by ESRI : http://esri.maps.arcgis.com/apps/View/index.html?appid=d6b18a2e774c4959ba855f6ac90952a2 http://esri.maps.arcgis.com/apps/View/index.html?appid=d6b18... Closed source but very impressive