From 1673e00e2ba3c5a1f2517df1df8da2d6d6972c84 Mon Sep 17 00:00:00 2001
From: Naman Goel <naman34@gmail.com>
Date: Mon, 16 May 2016 07:47:56 -0700
Subject: [PATCH] correct flow types

Summary:
The function should have optional arguments, but not nullable types.
Closes https://github.com/facebook/react-native/pull/7580

Differential Revision: D3304994

Pulled By: davidaurelio

fbshipit-source-id: 9918817429126ea16dd3076b61a3493c3a3a8388
---
 .../Navigator/Navigation/NavigationRouteStack.js                | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js b/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
index fd0d93222..486285177 100644
--- a/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
+++ b/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
@@ -117,7 +117,7 @@ class RouteStack {
     return this._routeNodes.findIndex(finder, this);
   }
 
-  slice(begin: ?number, end: ?number): RouteStack {
+  slice(begin?: number, end?: number): RouteStack {
     var routeNodes = this._routeNodes.slice(begin, end);
     var index = Math.min(this._index, routeNodes.size - 1);
     return this._update(index, routeNodes);