is esri-leaflet officially an esri project on github?

Is the information found on github for ESRI-leaflet, officially part of the ESRI development team for Leaflet? What I mean is http://ift.tt/18N35cU officially being developed by ESRI developers. I know this may sound like a pedestrian type of questions since Github is a social network for developers. But I am a bit confused, and trying to figure out if ESRI-Leaflet has been blessed by ESRI, or it is independent project where someone was able to developed an extention for ESRI, but is not really part of the official ESRI developer community.