You realize that "hey" is just the command-line interface to Haiku's view scripting system, right? We don't have a JS/Python interface (yet), but the C++ interface is well documented (see this: https://www.haiku-os.org/legacy-docs/bebook/TheApplicationKi... for an introduction, and also hey's source code: https://github.com/haiku/haiku/blob/master/src/bin/hey.cpp).