How to ensure web worker process only last message?

I have a scenario where it might happen that user produces events rapidly (hovers, e.g.). Each hover sends a message to web worker to do some calculation. Each new message should cancel the previous one and I need to be sure only last one will be processed and its result returned back to UI thread.

How can I make sure that web worker processes only last message it receives? I would like to avoid any debounce time as its important that delay is minimal.

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