From c52a15a998e66d7ea9b42e01ff27325a7166f37f Mon Sep 17 00:00:00 2001
From: Dara Carolan <daraclare@gmail.com>
Date: Thu, 13 Dec 2018 09:20:41 +0000
Subject: [PATCH] make onViewportChange optional

---
 types/react-map-gl/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/react-map-gl/index.d.ts b/types/react-map-gl/index.d.ts
index 2ae7ddbdf9..772e24081f 100644
--- a/types/react-map-gl/index.d.ts
+++ b/types/react-map-gl/index.d.ts
@@ -301,7 +301,7 @@ export class Popup extends BaseControl<PopupProps> {}
 export interface NavigationControlProps extends BaseControlProps {
     className?: string;
     onViewStateChange?: (info: ViewStateChangeInfo) => void;
-    onViewportChange: (viewport: ViewState) => void;
+    onViewportChange?: (viewport: ViewState) => void;
     showCompass?: boolean;
     showZoom?: boolean;
 }