Shell in new Framework?

I’m rebuilding an App that uses MacOSLib because it doesn’t allow me to compile in 64bit with it.
The last thing on the list is rebuilding my Async NSTask Shells. I started using using NSTask because the standard Shell (from the old framework) is unreliable during rapid fire (often, shells aren’t started. Pid is 0 but .isrunning is true). However, I cannot figure out the declares so that I get events like .dataavailable or .iscompleted can be used.

So I was wondering if the Shell from the new framework would work better but I cannot find it anywhere.
Is it called (or does it work differently) now?

There is no Shell in the new framework yet.