From eb868d6677d76e3f370420c3e668fc86adfda3d6 Mon Sep 17 00:00:00 2001
From: Jinesh Shah <jineshshah36@users.noreply.github.com>
Date: Thu, 5 Jul 2018 13:14:11 -0400
Subject: [PATCH] Fixed headerLeft and headerRight props (#26881)

* Update index.d.ts

Fixed headerLeft and headerRight types

* Update index.d.ts
---
 types/react-navigation/index.d.ts | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/types/react-navigation/index.d.ts b/types/react-navigation/index.d.ts
index b58f3778ae..02dc72d98f 100644
--- a/types/react-navigation/index.d.ts
+++ b/types/react-navigation/index.d.ts
@@ -395,22 +395,24 @@ export interface NavigationSwitchRouterConfig {
 export interface NavigationStackScreenOptions {
   title?: string;
   header?:
-  | (
-    | React.ReactElement<any>
-    | ((headerProps: HeaderProps) => React.ReactElement<any>))
+  | React.ReactElement<any>
+  | ((headerProps: HeaderProps) => React.ReactElement<any>)
   | null;
   headerTransparent?: boolean;
   headerTitle?: string | React.ReactElement<any>;
   headerTitleStyle?: StyleProp<TextStyle>;
   headerTitleAllowFontScaling?: boolean;
   headerTintColor?: string;
-  headerLeft?: React.ReactElement<any>;
+  headerLeft?:
+  | React.ReactElement<any>
+  | ((backButtonProps: HeaderBackButtonProps) => React.ReactElement<any>)
+  | null;
   headerBackTitle?: string | null;
   headerBackImage?: React.ReactElement<any>;
   headerTruncatedBackTitle?: string;
   headerBackTitleStyle?: StyleProp<TextStyle>;
   headerPressColorAndroid?: string;
-  headerRight?: React.ReactElement<any>;
+  headerRight?: React.ReactElement<any> | null;
   headerStyle?: StyleProp<ViewStyle>;
   headerForceInset?: HeaderForceInset;
   headerBackground?: React.ReactNode | React.ReactType;