From ef82822b422b2764c9fa045323a0349c042da839 Mon Sep 17 00:00:00 2001
From: alpadev <alpa.muc@gmail.com>
Date: Wed, 31 Mar 2021 14:29:31 +0200
Subject: [PATCH] refactor: simplify custom events regex and move it to a
 variable

requested by GeoSot - https://github.com/twbs/bootstrap/pull/33310#discussion_r601925640
---
 js/src/dom/event-handler.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/js/src/dom/event-handler.js b/js/src/dom/event-handler.js
index 834f5b2fe8bf..8ccb887fc3bf 100644
--- a/js/src/dom/event-handler.js
+++ b/js/src/dom/event-handler.js
@@ -22,6 +22,7 @@ const customEvents = {
   mouseenter: 'mouseover',
   mouseleave: 'mouseout'
 }
+const customEventsRegex = /^(mouseenter|mouseleave)/i
 const nativeEvents = new Set([
   'click',
   'dblclick',
@@ -165,8 +166,8 @@ function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
   }
 
   // in case of mouseenter or mouseleave wrap the handler within a function that checks for its DOM position
-  // this prevents the handler getting triggered the same way as mouseover or mouseout does
-  if (/^mouse(enter|leave)/i.test(originalTypeEvent)) {
+  // this prevents the handler from being dispatched the same way as mouseover or mouseout does
+  if (customEventsRegex.test(originalTypeEvent)) {
     const wrapFn = fn => {
       return function (event) {
         if (!event.relatedTarget || (event.relatedTarget !== event.delegateTarget && event.relatedTarget.contains(event.delegateTarget))) {