This looks awesome, I had two questions:

Is there a structured concurrency library being used to manage the chained promise calls and lazy evaluation (IE when the final promise result is actually awaited) of the chained functions?

If an await call is never added, would function calls continue to build up taking up more and more memory - I imagine the system would return an error and clear out the stack of calls before it became overwhelmed, what would these errors look like if they do indeed exist?