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// When MessagePort.onmessage is set to a value that is not a function, the
// setter should call .unref() and .stop(), clearing a previous onmessage
// listener from holding the event loop open. This test confirms that
// functionality.
'use strict';
const common = require('../common');
const { Worker, parentPort } = require('worker_threads');
// Do not use isMainThread so that this test itself can be run inside a Worker.
if (!process.env.HAS_STARTED_WORKER) {
process.env.HAS_STARTED_WORKER = 1;
const w = new Worker(__filename);
w.postMessage(2);
} else {
// .onmessage uses a setter. Set .onmessage to a function that ultimately
// should not be called. This will call .ref() and .start() which will keep
// the event loop open (and prevent this from exiting) if the subsequent
// assignment of a value to .onmessage doesn't call .unref() and .stop().
parentPort.onmessage = common.mustNotCall();
// Setting `onmessage` to a value that is not a function should clear the
// previous value and also should allow the event loop to exit. (In other
// words, this test should exit rather than run indefinitely.)
parentPort.onmessage = 'fhqwhgads';
}
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