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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/lastEventId below:

MessageEvent: lastEventId property

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Note: This feature is available in Web Workers.

The lastEventId read-only property of the MessageEvent interface is a string representing a unique ID for the event.

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A string representing the ID.

js

myWorker.onmessage = (e) => {
  result.textContent = e.data;
  console.log("Message received from worker");
  console.log(e.lastEventId);
};

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