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As opposed to what, threads? They have contributed towards improving software quality? In most languages with mutable state they've been a disaster -- correct me if I'm wrong.

Adding threads in JavaScript would also be a disaster. Practically everything is mutable and there are absolutely no locking mechanisms.

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One possible solution to introduce threads to JS is to isolate threads from each other and use only message-passing:

https://github.com/audreyt/node-webworker-threads/

Sorry, but share-nothing threads that can only communicate via (afaics) serialized message passing are no longer threads. There is very little benefit to those compared to just spawning child processes.

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