From 6395aa610fbce612a69cc20f30df80a3869d2b56 Mon Sep 17 00:00:00 2001
From: Yagiz Nizipli <yagiz@nizipli.com>
Date: Tue, 13 Sep 2022 12:18:56 -0400
Subject: [PATCH] events: improve event performance

---
 lib/events.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/events.js b/lib/events.js
index 7abf18f42c0064..a5b1b058561168 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -58,6 +58,9 @@ const {
   identicalSequenceRange,
 } = require('internal/util/inspect');
 
+function NullObject() {}
+NullObject.prototype = ObjectCreate(null);
+
 let spliceOne;
 
 const {
@@ -338,7 +341,7 @@ EventEmitter.init = function(opts) {
 
   if (this._events === undefined ||
       this._events === ObjectGetPrototypeOf(this)._events) {
-    this._events = ObjectCreate(null);
+    this._events = new NullObject();
     this._eventsCount = 0;
   }
 
@@ -547,7 +550,7 @@ function _addListener(target, type, listener, prepend) {
 
   events = target._events;
   if (events === undefined) {
-    events = target._events = ObjectCreate(null);
+    events = target._events = new NullObject();
     target._eventsCount = 0;
   } else {
     // To avoid recursion in the case that type === "newListener"! Before
@@ -685,7 +688,7 @@ EventEmitter.prototype.removeListener =
 
       if (list === listener || list.listener === listener) {
         if (--this._eventsCount === 0)
-          this._events = ObjectCreate(null);
+          this._events = new NullObject();
         else {
           delete events[type];
           if (events.removeListener)
@@ -740,11 +743,11 @@ EventEmitter.prototype.removeAllListeners =
       // Not listening for removeListener, no need to emit
       if (events.removeListener === undefined) {
         if (arguments.length === 0) {
-          this._events = ObjectCreate(null);
+          this._events = new NullObject();
           this._eventsCount = 0;
         } else if (events[type] !== undefined) {
           if (--this._eventsCount === 0)
-            this._events = ObjectCreate(null);
+            this._events = new NullObject();
           else
             delete events[type];
         }
@@ -758,7 +761,7 @@ EventEmitter.prototype.removeAllListeners =
           this.removeAllListeners(key);
         }
         this.removeAllListeners('removeListener');
-        this._events = ObjectCreate(null);
+        this._events = new NullObject();
         this._eventsCount = 0;
         return this;
       }