App.js

import React from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

const App: () => React$Node = () => {
  // ........
};

function WarnLogboxStack() {
  console.warn('I have a useless stack!');
  return <View></View>;
}

function ErrorLogboxStack() {
  console.error('I have a error logbox!');
  return <View></View>;
}

const styles = StyleSheet.create({
  //...........
});

export default App;