2.0.0
This a rewrite of the app for Mojave-only. The app should be faster to launch and it will be easier to add additional features in future versions.
Important: When opening the app for the first time, click somewhere inside the Touch Bar, and you'll be prompted to allow the app to access accessibility features. Click "Open System Preferences" and check "Touch Bar Simulator.app" in the list.
Full details
Xcode 10 moved the required private symbols needed to trigger the Touch Bar simulator into the main IDEKit framework, which has a lot of dependencies on its own. I managed to get it working by including all those frameworks, but the app ended up being 700 MB... I then went back to the drawing board. I discovered a way to communicate with the Touch Bar simulator directly.