Response and other stuff from the js package, but there is no js package, or well, there is one but I don't think it's related, there is no Response in that package. Then if I go to this example https://github.com/cloudflare/python-worker-hello-world/blob/master/index.py there is an addEventListener which afaik is not part of python.on_fetch() function and call other functions from there as that's the only part where I can actually access the environment variables, is this right?functions subdirectory to store the workers.