Closure to pass navigation instance to onCompleted function

NewTweet.tsx

const NewTweet: NavigationScreenComponent = ({ navigation }) => {
  const [content, setContent] = useState("");

  const handleCreateTweet = () => {
    const input = {
      content
    };

    // TODO: implement optimistic to update the Relay store
    const onCompleted = (() => {
      const nav = navigation;

      return function(response: TweetCreateMutationResponse) {
        if (!response.TweetCreate) return;

        const { content: success, error } = response.TweetCreate;

        error && Alert.alert(error);

        success && setContent("") && nav.goBack();
      };
    })();

    const onError = () => {
      Alert.alert("Algo deu errado ao criar o tweet");
    };

    TweetCreateMutation.commit(input, onCompleted, onError);
  };

  return (
    <View>
      <Buttons>
        <CancelarButton />
        <TweetarButton disabled={!content.length} onPress={handleCreateTweet} />
      </Buttons>
      <TweetInput
        value={content}
        onChangeText={t => setContent(t)}
        placeholder="O que está acontecendo?"
        autoFocus
        multiline
      />
    </View>
  );
};

// TODO: implement optimistic to update the Relay store
    const onCompleted = (response: TweetCreateMutationResponse) => {
      if (!response.TweetCreate) return;

      const { content: success, error } = response.TweetCreate;

      error && Alert.alert(error);

      success && setContent("") && navigation.goBack();
    };