Counts the number of listeners attached to a pubsub listener tree.

eventemitter2-listenerCount.js

function countListeners(tree) {
  
	var count = 0

	for (var i in tree) {
		if (tree.hasOwnProperty(i) && typeof tree[i] === "object") {
			count += countListeners(tree[i])
		}

		if (typeof tree._listeners === "function") {
			count += 1
		} else if ( tree._listeners instanceof Array ) {
			count += tree._listeners.length
		}
	}

	return count
}

Usage:

countListeners(pubsubInstance.listenerTree)