modernjs/chapter12/App.js

import React from "react";
import { StyleSheet, Text, View } from "react-native";

export default class App extends React.Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>Open up App.js to start working on your app!</Text>
                <Text>Changes you make will automatically reload.</Text>
                <Text>Shake your phone to open the developer menu.</Text>
            </View>
        );
    }
}

const white: string = "#fff";

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: white,
        alignItems: "center",
        justifyContent: "center"
    }
});