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by klibertp 4215 days ago
> the external thread will queue up a V8 event

> So you see, it's parallel but doesn't need any JS synchronizatioon.

I don't know much about V8/Node internals, but I think we can regard the queue as a synchronization primitive? Granted, from what you say it's not in JS, but it's there, so at least some JS implementations need synchronization.