From f395292876cf2659ce780677759611573f902e7b Mon Sep 17 00:00:00 2001
From: Stephan Meijer <stephan.meijer@gmail.com>
Date: Mon, 13 Apr 2020 16:01:12 +0200
Subject: [PATCH] fix incorrect window check

---
 docs/hooks/useConfigureLeaflet.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/hooks/useConfigureLeaflet.ts b/docs/hooks/useConfigureLeaflet.ts
index 961b909f..63c66a52 100644
--- a/docs/hooks/useConfigureLeaflet.ts
+++ b/docs/hooks/useConfigureLeaflet.ts
@@ -7,11 +7,13 @@ const viewport: Viewport = {
 };
 
 export interface LeafletConfig {
-  viewport: Viewport;
+  viewport?: Viewport;
 }
 
 const useConfigureLeaflet = (): LeafletConfig => {
-  if (!window) return;
+  if (typeof window === 'undefined') {
+    return {};
+  }
 
   // To get around an issue with the default icon not being set up right between using React
   // and importing the leaflet library, we need to reset the image imports