content: import React from 'react';
  import { StyleSheet, Text, View } from 'react-native';
  
  class App extends React.Component {
    render() {
      return (
        <View style={styles.box}>
          <Text style={styles.text}>Hello, world!</Text>
        </View>
      );
    }
  }
  
  const styles = StyleSheet.create({
    box: { padding: 10 },
    text: { fontWeight: 'bold' },
  });
  
  export default App;
  