CODEWITHSUNDEEP
javascripteventemitter
nicholaswmin
nicholaswmin

Reputation: 22999

Node.js EventEmitter2; How to remove listeners added with onAny

How can I remove all event listeners that listen on any event?

I've tried removeAllListeners() but it's not working. Am I missing something?

const ee = new EventEmitter2()
  
ee.onAny(() => console.log('hello was fired'))
setInterval(() => ee.emit('hello'), 500)

setTimeout(() => {
  ee.removeAllListeners()
  console.log('removed all listeners')
}, 1500)
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/eventemitter2.min.js"></script>

Upvotes: 0

Views: 821

Answers (1)

zero298
zero298

Reputation: 26930

It seems as though the API for this library is somewhat confusing. To deregister onAny() listeners, you use offAny().

Drilling down into the source reveals that removeAllListeners() doesn't really touch the _all array that tracks the listeners for any event. It just runs init() and configure() on the listener again none of which touches that _all array.

Also note your issue on the GitHub page here: removeAllListeners does not remove listeners added with onAny #235

If you want to actually remove them all do something like this:

const ee = new EventEmitter2();

ee.onAny(() => console.log("any event was fired"));
ee.on("hello", () => console.log("hello event was fired"));

setInterval(() => ee.emit("hello"), 500);

setTimeout(() => {
  console.log("Removing any listener");
  ee.offAny();
}, 1500);

setTimeout(() => {
  console.log("Removing all listeners");
  ee.removeAllListeners();
}, 3000);
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lib/eventemitter2.min.js"></script>

Upvotes: 1

Related Questions