App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow
 */

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";

import { getGlobalData, setGlobalData } from "./TestGlobalVarProblemModule";

const App: () => React$Node = () => {
  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
        <ScrollView
          contentInsetAdjustmentBehavior="automatic"
          style={styles.scrollView}
        >
          <Header />
          {global.HermesInternal == null ? null : (
            <View style={styles.engine}>
              <Text style={styles.footer}>Engine: Hermes</Text>
            </View>
          )}
          <View style={styles.body}>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Test Global Var</Text>
              <Text style={styles.sectionDescription}>
                getGlobalData = {getGlobalData()}
              </Text>
              <Text style={styles.sectionDescription}>
                setGlobalData = {setGlobalData("Bob")}
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Step One</Text>
              <Text style={styles.sectionDescription}>
                Edit <Text style={styles.highlight}>App.js</Text> to change this
                screen and then come back to see your edits.
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>See Your Changes</Text>
              <Text style={styles.sectionDescription}>
                <ReloadInstructions />
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Debug</Text>
              <Text style={styles.sectionDescription}>
                <DebugInstructions />
              </Text>
            </View>
            <View style={styles.sectionContainer}>
              <Text style={styles.sectionTitle}>Learn More</Text>
              <Text style={styles.sectionDescription}>
                Read the docs to discover what to do next:
              </Text>
            </View>
            <LearnMoreLinks />
          </View>
        </ScrollView>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  scrollView: {
    backgroundColor: Colors.lighter
  },
  engine: {
    position: "absolute",
    right: 0
  },
  body: {
    backgroundColor: Colors.white
  },
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: "600",
    color: Colors.black
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: "400",
    color: Colors.dark
  },
  highlight: {
    fontWeight: "700"
  },
  footer: {
    color: Colors.dark,
    fontSize: 12,
    fontWeight: "600",
    padding: 4,
    paddingRight: 12,
    textAlign: "right"
  }
});

export default App;