events: speed up newListener/removeListener events

Author: bnoordhuis

lib/events.js

@@ -133,8 +133,10 @@ EventEmitter.prototype.addListener = function(type, listener) {
 
   // To avoid recursion in the case that type == "newListeners"! Before
   // adding it to the listeners, first emit "newListeners".
-  this.emit('newListener', type, typeof listener.listener === 'function' ?
-            listener.listener : listener);
+  if (this._events.newListener) {
+    this.emit('newListener', type, typeof listener.listener === 'function' ?
+              listener.listener : listener);
+  }
 
   if (!this._events[type]) {
     // Optimize the case of one listener. Don't need the extra array object.
@@ -217,12 +219,18 @@ EventEmitter.prototype.removeListener = function(type, listener) {
     list.splice(position, 1);
     if (list.length == 0)
       delete this._events[type];
-    this.emit('removeListener', type, listener);
+
+    if (this._events.removeListener) {
+      this.emit('removeListener', type, listener);
+    }
   } else if (list === listener ||
              (list.listener && list.listener === listener))
   {
     delete this._events[type];
-    this.emit('removeListener', type, listener);
+
+    if (this._events.removeListener) {
+      this.emit('removeListener', type, listener);
+    }
   }
 
   return this;