Lambda questions

First, Hooray for the Xano team and pushing out this power tool! I have some technical questions that may be of interest to the community as well:
1. What version of NodeJS does the lambda use?
2. What is the maximum code size of a lambda?
3. What is the maximum execution time of a lambda?
4. What is the way to return from an asynchronous context in a lambda? Is one to assume we are inside an async function context (e.g. the await keyword works) - but if we are in a callback context, how do we announce 'I'm done!' - is there an output/return function one can call?
5. What is the scope for the dollar-sign variables? Are they inside some wrapper function, or are they direct members of 'global'?

Can't wait to really dig into this!