I updgraded from react 16.2 -> 16.3-alpha-1 and react-native 0.52->0.54 and I get the warning above in the simulator.
To fix the error in any list components where a keyExtractor is in use, update the Component (FlatList etc) to have a string key with .toString(). All keys must now be string values.
Like below;
keyExtractor={item => item.index_id}
to
keyExtractor={item => item.index_id.toString()}
This change is a requirement for all uses of a keyExtractor so that would include React-Native components like; FlatList and ActionSheet.
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