ect with an associated callback.
This callback may be called multiple times, for example, the <code>'connection'</code>
event in <code>net.createServer()</code>, or just a single time like in <code>fs.open()</code>.
A resource can also be closed before the callback is called. <code>AsyncHook</code> does
not explicitly distinguish between these different cases but will represent them
as the abstract concept that is a resource.</p>
<p>If <a href="worker_threads.html#worker_threads_class_worker"><code>Worker</