From c5c5c38eff5faaa8fdb21ccd6934948a865668b9 Mon Sep 17 00:00:00 2001
From: Phil Blais <phil_blais@hotmail.com>
Date: Wed, 4 Mar 2020 20:17:30 -0500
Subject: [PATCH 1/2] Add polyfill for CustomEvent to fix #1186

---
 src/gridstack-poly.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/gridstack-poly.js b/src/gridstack-poly.js
index 3f69a3a92..657ceaf1c 100644
--- a/src/gridstack-poly.js
+++ b/src/gridstack-poly.js
@@ -5,6 +5,18 @@
  * gridstack.js may be freely distributed under the MIT license.
 */
 
+// https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent
+if (typeof window.CustomEvent !== "function") {
+  function CustomEvent (event, params) {
+    params = params || {bubbles: false, cancelable: false, detail: null};
+    var evt = document.createEvent('CustomEvent');
+    evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
+    return evt;
+  }
+
+  window.CustomEvent = CustomEvent;
+}
+
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN
 Number.isNaN = Number.isNaN || function isNaN(input) {
   return typeof input === 'number' && input !== input;

From f1ec3e2f1226e0ebc9981f39dec9c8ec0c979bc4 Mon Sep 17 00:00:00 2001
From: Phil Blais <phil_blais@hotmail.com>
Date: Wed, 4 Mar 2020 21:06:14 -0500
Subject: [PATCH 2/2] Scope the CustomEvent polyfill

---
 src/gridstack-poly.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/gridstack-poly.js b/src/gridstack-poly.js
index 657ceaf1c..5ec62d795 100644
--- a/src/gridstack-poly.js
+++ b/src/gridstack-poly.js
@@ -6,7 +6,11 @@
 */
 
 // https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent
-if (typeof window.CustomEvent !== "function") {
+(function () {
+  if (typeof window.CustomEvent === "function") {
+    return false;
+  }
+
   function CustomEvent (event, params) {
     params = params || {bubbles: false, cancelable: false, detail: null};
     var evt = document.createEvent('CustomEvent');
@@ -15,7 +19,7 @@ if (typeof window.CustomEvent !== "function") {
   }
 
   window.CustomEvent = CustomEvent;
-}
+})();
 
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN
 Number.isNaN = Number.isNaN || function isNaN(input) {