Type Warning

[xiaosenmao]

1. react-native-tab-navigator/TabNavigator.js

   Line 51 in 5004fa9

   _updateRenderedSceneKeys(children, oldSceneKeys = Set()): Set {

2. react-native-tab-navigator/TabNavigator.js

   Line 47 in 5004fa9

   _getSceneKey(item, index): string {