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test/parallel/test-worker-ref-onexit.js

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+'use strict';
+const common = require('../common');
+const { Worker } = require('worker_threads');
+
+// Check that worker.unref() makes the 'exit' event not be emitted, if it is
+// the only thing we would otherwise be waiting for.
+
+// Use `setInterval()` to make sure the worker is alive until the end of the
+// event loop turn.
+const w = new Worker('setInterval(() => {}, 100);', { eval: true });
+w.unref();
+w.on('exit', common.mustNotCall());