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Worker threads aren't share-nothing, you can share data through SharedArrayBuffer which lets you share arbitrary binary data.

If they were share nothing, we probably wouldn't have shipped them.

Source: I'm Node.js core and one of the people who worked on them

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You can also share arbitrary binary data between processes by using shared memory (e.g. Python has support for this in multiprocessing.shared_memory module).

Sorry, I realized after posting that I should have said "share-nothing by default". There are ways to share memory with a worker, but it's explicit and opt-in via a dedicated API. It's not like in Python where you can arbitrarily change global state from any thread.

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