Bouncing this thread up as I am interested in this too. I use Appium from source but when it comes to debugging with breakpoints, I haven't found anything that works well. Visual Studio code does a good job of hitting breakpoints in files under /build but I haven't been able to get sourcemaps working so debugging is a pain. Sometimes, it doesn't hit the breakpoints and at other times, all the async and generator calls make it dizzy. Tried the Theseus debugger as well - apparently it doesn't support breakpoints.
So, what do people developing/contributing to Appium use for debugging Appium itself?
