From 74b6802bb463688256c7ba80eb25105a45b3b09a Mon Sep 17 00:00:00 2001
From: Justin Brumley <justinbrumley012@gmail.com>
Date: Wed, 24 Jun 2020 03:31:27 -0500
Subject: [PATCH] fix(polyfill): check that window exists before defining
 CustomEvent (#1855)

---
 src/polyfill.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/polyfill.js b/src/polyfill.js
index 3c08c3e3e..a234ee5e0 100644
--- a/src/polyfill.js
+++ b/src/polyfill.js
@@ -1,5 +1,5 @@
 (() => {
-  if ( typeof window.CustomEvent === 'function' ) return;
+  if ( typeof window !== 'object' || typeof window.CustomEvent === 'function' ) return;
 
   const CustomEvent = (( event, params ) => {
     params = params || { bubbles: false, cancelable: false, detail: null };