events: improve listeners() performance

PR-URL: #33863
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

Author: mscdex

benchmark/events/ee-listeners.js

@@ -14,7 +14,7 @@ function main({ n, listeners, raw }) {
 
 for(letk=0;k<listeners;k+=1){
 ee.on('dummy0',()=>{});
-ee.on('dummy1',()=>{});
+ee.once('dummy1',()=>{});
 }
 
 if(raw==='true'){

lib/events.js

@@ -22,7 +22,6 @@
 'use strict';
 
 const{
- Array,
  Boolean,
  Error,
  MathMin,
@@ -613,9 +612,11 @@ function arrayClone(arr) {
 }
 
 functionunwrapListeners(arr){
-constret=newArray(arr.length);
+constret=arrayClone(arr);
 for(leti=0;i<ret.length;++i){
-ret[i]=arr[i].listener||arr[i];
+constorig=ret[i].listener;
+if(typeoforig==='function')
+ret[i]=orig;
 }
 returnret;
 }