From 690be82d4a87de3264bcf49d1e45eedeecce66fb Mon Sep 17 00:00:00 2001
From: Ashoat Tevosyan <ashoat@gmail.com>
Date: Mon, 5 Mar 2018 14:04:29 -0500
Subject: [PATCH] Fix NavigationEventPayload.lastState type (#3664)

Should be nullable, since it is initially called as `null` in `src/createNavigationContainer.js` (and in `react-navigation-redux-helpers`, where it is causing a Flow error)
---
 packages/react-navigation/flow/react-navigation.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-navigation/flow/react-navigation.js b/packages/react-navigation/flow/react-navigation.js
index 4354d541..bfb8b580 100644
--- a/packages/react-navigation/flow/react-navigation.js
+++ b/packages/react-navigation/flow/react-navigation.js
@@ -459,7 +459,7 @@ declare module 'react-navigation' {
     type: EventType,
     action: NavigationAction,
     state: NavigationState,
-    lastState: NavigationState,
+    lastState: ?NavigationState,
   };
 
   declare export type NavigationEventCallback = (