JS is single-threaded by design and node encourages use of asynchronous operations and then runs callbacks on the event loop. Node provides higher-level non-blo

JS is single-threaded by design and node encourages use of asynchronous operations and then runs callbacks on the event loop. Node provides higher-level non-blocking function spawn, so closh currently does not need to do forking directly. I hope this can get us far before the need to drop into lower level and start dealing with threads. I am curious, what does fish use threads for and how does it handle them?