From 85e85153595dc7ef6dad1b2cd8447be70ae3ad6c Mon Sep 17 00:00:00 2001
From: Filip Spiridonov <filip.spiridonov@gmail.com>
Date: Tue, 28 Jan 2020 18:21:15 -0800
Subject: [PATCH] Fix "ReferenceError: self is not defined" (#4593)

---
 src/util/browser/window.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/util/browser/window.js b/src/util/browser/window.js
index 7a525659dbb..ad29b1edbfa 100644
--- a/src/util/browser/window.js
+++ b/src/util/browser/window.js
@@ -2,4 +2,6 @@
 /* eslint-env browser */
 import type {Window} from '../../types/window';
 
-export default (self: Window);
+const win: ?Window = typeof self !== 'undefined' ? self : undefined;
+
+export default win;