worker.onmessage is not called

[surma]

// main.mjs
import {Worker} from 'worker_threads';

const worker = new Worker("./worker.mjs");
worker.onmessage = ev => console.log("onmessage", ev);
worker.on("message", ev => console.log("EventEmitter", ev));
worker.postMessage("from main to worker")

// worker.mjs
import {parentPort} from 'worker_threads';

parentPort.onmessage = ev => console.log(ev);
parentPort.postMessage("from worker to main");

If you run the main.mjs file above, you’ll see only the EventEmitter handler is called, but not the one registered via onmessage.

I think for consistence (as well as the fake MessageEvent handling introduced in #26082), it is desirable to add support for onmessage on Worker.

cc @addaleax

[GrosSacASac]

Thanks, we should also consider supporting .addEventListener and .removeEventListener as well.
Web Worker in the browser support it.

[jasnell]

Refs: #34057

[addaleax]

To be clear, #34057 does this for MessagePort, not Worker. I’m not sure whether we really want this for the Worker class itself.

[jasnell]

Yep, not really seeing much value in having Worker extend EventTarget right now.

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[github-actions]

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