Yep. It’s embedded in the add-on now. 
Yes but the usual work around is to do a Promise and await but that only works when you have a loop which normal JS in the browser and Node have but seems to be lacking in GraalVM JavaScript. So you make the promise and try to await and the rule just exits.
We might have to do something ugly in the library like a busy while loop. It’ll be super ugly though because we can’t even yield or nice the loop so it will spike the CPU while “sleeping”.