anchor.diff:    return isOnline;
   }
   
  -var FriendListItem = react.registerFunctionComponent(_friendListItem, displayName: 'FriendListItem');
  -
  -_friendListItem(Map props) {
  +var FriendListItem = react.registerFunctionComponent((Map props) {
     final isOnline = useFriendStatus(props['friend']['id']);
   
     return react.li({
  
positive.code:   }, [
      props['friend']['name']
    ]);
  }
  
  void main() {
    setClientConfiguration();
  
negative.code:   'unsubscribeFromFriendStatus': (int id, Function handleStatusChange) => handleStatusChange({'isOnline': false}),
  };
  
  // Custom Hook
  StateHook useFriendStatus(friendID) {
    final isOnline = useState(false);
  
  