From 5db9488c07b60336f889c1681e910cb41a8f8298 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noel=20Kim=20=28=EA=B9=80=EB=AF=BC=ED=98=81=29?=
 <noel@chequer.io>
Date: Wed, 18 May 2022 17:55:10 +0900
Subject: [PATCH] fix(chore): type guard for globalWindow

---
 lib/channel-postmessage/src/index.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/channel-postmessage/src/index.ts b/lib/channel-postmessage/src/index.ts
index c4221f5509d4..c14dc401cd6f 100644
--- a/lib/channel-postmessage/src/index.ts
+++ b/lib/channel-postmessage/src/index.ts
@@ -35,7 +35,9 @@ export class PostmsgTransport {
   constructor(private readonly config: Config) {
     this.buffer = [];
     this.handler = null;
-    globalWindow.addEventListener('message', this.handleEvent.bind(this), false);
+    if (globalWindow) {
+      globalWindow.addEventListener('message', this.handleEvent.bind(this), false);
+    }
 
     // Check whether the config.page parameter has a valid value
     if (config.page !== 'manager' && config.page !== 'preview') {