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

MessageEvent: ports property - Web APIs

MessageEvent: ports property

Baseline Widely available

Note: This feature is available in Web Workers.

The ports read-only property of the MessageEvent interface is an array of MessagePort objects containing all MessagePort objects sent with the message, in order.

Value

An array of MessagePort objects.

Examples
onconnect = (e) => {
  const port = e.ports[0];

  port.addEventListener("message", (e) => {
    const workerResult = `Result: ${e.data[0] * e.data[1]}`;
    port.postMessage(workerResult);
  });

  port.start(); // Required when using addEventListener. Otherwise called implicitly by onmessage setter.
};
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