I was waiting for this to appear in 4.2 as well, but unfortunately it obviously didn't make it. I needed some drawing capability so created a class to do it.
Have put it in this github repo - https://github.com/nickcam/angular2-esri-netcore
It's an angular2 and .Net core project but the drawTools class within the project itself doesn't use anything angular2 related so you could just copy it and use it somewhere else.
Hope it helps.