worker.onmessage is not called

@addaleax

// 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

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

Refs: #34057

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

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

There has been no activity on this feature request for 5 months and it is unlikely to be implemented. It will be closed 6 months after the last non-automated comment.

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worker.onmessage is not called #26856

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worker.onmessage is not called #26856

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GrosSacASac commented on Apr 1, 2019

jasnell commented on Jun 26, 2020

addaleax commented on Jun 26, 2020

jasnell commented on Jun 26, 2020

github-actions commented on Mar 8, 2022

github-actions commented on Apr 8, 2022

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