Run Prettier on Flow libdef on precommit (#3495)

packages/react-navigation/flow/react-navigation.js

@@ -332,12 +332,12 @@ declare module 'react-navigation' {
     navigationOptions?: ?NavigationScreenConfig<Options>,
   };
 
-  declare export type NavigationRouteConfig = 
-  | NavigationComponent
-  | {
-    navigationOptions?: NavigationScreenConfig<*>,
-    path?: string,
-  } & NavigationScreenRouteConfig;
+  declare export type NavigationRouteConfig =
+    | NavigationComponent
+    | ({
+        navigationOptions?: NavigationScreenConfig<*>,
+        path?: string,
+      } & NavigationScreenRouteConfig);
 
   declare export type NavigationScreenRouteConfig =
     | NavigationComponent

packages/react-navigation/package.json

@@ -72,6 +72,10 @@
     "modulePathIgnorePatterns": ["examples"]
   },
   "lint-staged": {
-    "*.js": ["eslint --fix", "git add"]
+    "*.js": [
+      "eslint --fix",
+      "prettier --write flow/react-navigation.js",
+      "git add"
+    ]
   }
 }