Created a new Expo app

.expo-shared/assets.json

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+{
+  "e997a5256149a4b76e6bfd6cbf519c5e5a0f1d278a3d8fa1253022b03c90473b": true,
+  "af683c96e0ffd2cf81287651c9433fa44debc1220ca7cb431fe482747f34a505": true,
+  "12bb71342c6255bbf50437ec8f4441c083f47cdb74bd89160c15e4f43e52a1cb": true,
+  "40b842e832070c58deac6aa9e08fa459302ee3f9da492c7e77d93d2fbf4a56fd": true
+}

.gitignore

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+node_modules/**/*
+.expo/*
+npm-debug.*
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+*.orig.*
+web-build/
+
+# macOS
+.DS_Store

App.tsx

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+import { StatusBar } from 'expo-status-bar';
+import React from 'react';
+import { SafeAreaProvider } from 'react-native-safe-area-context';
+
+import useCachedResources from './hooks/useCachedResources';
+import useColorScheme from './hooks/useColorScheme';
+import Navigation from './navigation';
+
+export default function App() {
+  const isLoadingComplete = useCachedResources();
+  const colorScheme = useColorScheme();
+
+  if (!isLoadingComplete) {
+    return null;
+  } else {
+    return (
+      <SafeAreaProvider>
+        <Navigation colorScheme={colorScheme} />
+        <StatusBar />
+      </SafeAreaProvider>
+    );
+  }
+}

app.json

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+{
+  "expo": {
+    "name": "naga",
+    "slug": "naga",
+    "version": "1.0.0",
+    "orientation": "portrait",
+    "icon": "./assets/images/icon.png",
+    "scheme": "myapp",
+    "userInterfaceStyle": "automatic",
+    "splash": {
+      "image": "./assets/images/splash.png",
+      "resizeMode": "contain",
+      "backgroundColor": "#ffffff"
+    },
+    "updates": {
+      "fallbackToCacheTimeout": 0
+    },
+    "assetBundlePatterns": [
+      "**/*"
+    ],
+    "ios": {
+      "supportsTablet": true
+    },
+    "android": {
+      "adaptiveIcon": {
+        "foregroundImage": "./assets/images/adaptive-icon.png",
+        "backgroundColor": "#FFFFFF"
+      }
+    },
+    "web": {
+      "favicon": "./assets/images/favicon.png"
+    }
+  }
+}

babel.config.js

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+module.exports = function(api) {
+  api.cache(true);
+  return {
+    presets: ['babel-preset-expo'],
+  };
+};

components/EditScreenInfo.tsx

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+import * as WebBrowser from 'expo-web-browser';
+import React from 'react';
+import { StyleSheet, TouchableOpacity } from 'react-native';
+
+import Colors from '../constants/Colors';
+import { MonoText } from './StyledText';
+import { Text, View } from './Themed';
+
+export default function EditScreenInfo({ path }: { path: string }) {
+  return (
+    <View>
+      <View style={styles.getStartedContainer}>
+        <Text
+          style={styles.getStartedText}
+          lightColor="rgba(0,0,0,0.8)"
+          darkColor="rgba(255,255,255,0.8)">
+          Open up the code for this screen:
+        </Text>
+
+        <View
+          style={[styles.codeHighlightContainer, styles.homeScreenFilename]}
+          darkColor="rgba(255,255,255,0.05)"
+          lightColor="rgba(0,0,0,0.05)">
+          <MonoText>{path}</MonoText>
+        </View>
+
+        <Text
+          style={styles.getStartedText}
+          lightColor="rgba(0,0,0,0.8)"
+          darkColor="rgba(255,255,255,0.8)">
+          Change any of the text, save the file, and your app will automatically update.
+        </Text>
+      </View>
+
+      <View style={styles.helpContainer}>
+        <TouchableOpacity onPress={handleHelpPress} style={styles.helpLink}>
+          <Text style={styles.helpLinkText} lightColor={Colors.light.tint}>
+            Tap here if your app doesn't automatically update after making changes
+          </Text>
+        </TouchableOpacity>
+      </View>
+    </View>
+  );
+}
+
+function handleHelpPress() {
+  WebBrowser.openBrowserAsync(
+    'https://docs.expo.io/get-started/create-a-new-app/#opening-the-app-on-your-phonetablet'
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+  },
+  developmentModeText: {
+    marginBottom: 20,
+    fontSize: 14,
+    lineHeight: 19,
+    textAlign: 'center',
+  },
+  contentContainer: {
+    paddingTop: 30,
+  },
+  welcomeContainer: {
+    alignItems: 'center',
+    marginTop: 10,
+    marginBottom: 20,
+  },
+  welcomeImage: {
+    width: 100,
+    height: 80,
+    resizeMode: 'contain',
+    marginTop: 3,
+    marginLeft: -10,
+  },
+  getStartedContainer: {
+    alignItems: 'center',
+    marginHorizontal: 50,
+  },
+  homeScreenFilename: {
+    marginVertical: 7,
+  },
+  codeHighlightText: {
+    color: 'rgba(96,100,109, 0.8)',
+  },
+  codeHighlightContainer: {
+    borderRadius: 3,
+    paddingHorizontal: 4,
+  },
+  getStartedText: {
+    fontSize: 17,
+    lineHeight: 24,
+    textAlign: 'center',
+  },
+  helpContainer: {
+    marginTop: 15,
+    marginHorizontal: 20,
+    alignItems: 'center',
+  },
+  helpLink: {
+    paddingVertical: 15,
+  },
+  helpLinkText: {
+    textAlign: 'center',
+  },
+});

components/StyledText.tsx

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+import * as React from 'react';
+
+import { Text, TextProps } from './Themed';
+
+export function MonoText(props: TextProps) {
+  return <Text {...props} style={[props.style, { fontFamily: 'space-mono' }]} />;
+}

components/Themed.tsx

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+import * as React from 'react';
+import { Text as DefaultText, View as DefaultView } from 'react-native';
+
+import Colors from '../constants/Colors';
+import useColorScheme from '../hooks/useColorScheme';
+
+export function useThemeColor(
+  props: { light?: string; dark?: string },
+  colorName: keyof typeof Colors.light & keyof typeof Colors.dark
+) {
+  const theme = useColorScheme();
+  const colorFromProps = props[theme];
+
+  if (colorFromProps) {
+    return colorFromProps;
+  } else {
+    return Colors[theme][colorName];
+  }
+}
+
+type ThemeProps = {
+  lightColor?: string;
+  darkColor?: string;
+};
+
+export type TextProps = ThemeProps & DefaultText['props'];
+export type ViewProps = ThemeProps & DefaultView['props'];
+
+export function Text(props: TextProps) {
+  const { style, lightColor, darkColor, ...otherProps } = props;
+  const color = useThemeColor({ light: lightColor, dark: darkColor }, 'text');
+
+  return <DefaultText style={[{ color }, style]} {...otherProps} />;
+}
+
+export function View(props: ViewProps) {
+  const { style, lightColor, darkColor, ...otherProps } = props;
+  const backgroundColor = useThemeColor({ light: lightColor, dark: darkColor }, 'background');
+
+  return <DefaultView style={[{ backgroundColor }, style]} {...otherProps} />;
+}

components/__tests__/StyledText-test.js

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+import * as React from 'react';
+import renderer from 'react-test-renderer';
+
+import { MonoText } from '../StyledText';
+
+it(`renders correctly`, () => {
+  const tree = renderer.create(<MonoText>Snapshot test!</MonoText>).toJSON();
+
+  expect(tree).toMatchSnapshot();
+});

constants/Colors.ts

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+const tintColorLight = '#2f95dc';
+const tintColorDark = '#fff';
+
+export default {
+  light: {
+    text: '#000',
+    background: '#fff',
+    tint: tintColorLight,
+    tabIconDefault: '#ccc',
+    tabIconSelected: tintColorLight,
+  },
+  dark: {
+    text: '#fff',
+    background: '#000',
+    tint: tintColorDark,
+    tabIconDefault: '#ccc',
+    tabIconSelected: tintColorDark,
+  },
+};

constants/Layout.ts

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+import { Dimensions } from 'react-native';
+
+const width = Dimensions.get('window').width;
+const height = Dimensions.get('window').height;
+
+export default {
+  window: {
+    width,
+    height,
+  },
+  isSmallDevice: width < 375,
+};

hooks/useCachedResources.ts

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+import { Ionicons } from '@expo/vector-icons';
+import * as Font from 'expo-font';
+import * as SplashScreen from 'expo-splash-screen';
+import * as React from 'react';
+
+export default function useCachedResources() {
+  const [isLoadingComplete, setLoadingComplete] = React.useState(false);
+
+  // Load any resources or data that we need prior to rendering the app
+  React.useEffect(() => {
+    async function loadResourcesAndDataAsync() {
+      try {
+        SplashScreen.preventAutoHideAsync();
+
+        // Load fonts
+        await Font.loadAsync({
+          ...Ionicons.font,
+          'space-mono': require('../assets/fonts/SpaceMono-Regular.ttf'),
+        });
+      } catch (e) {
+        // We might want to provide this error information to an error reporting service
+        console.warn(e);
+      } finally {
+        setLoadingComplete(true);
+        SplashScreen.hideAsync();
+      }
+    }
+
+    loadResourcesAndDataAsync();
+  }, []);
+
+  return isLoadingComplete;
+}

hooks/useColorScheme.ts

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+import { ColorSchemeName, useColorScheme as _useColorScheme } from 'react-native';
+
+// The useColorScheme value is always either light or dark, but the built-in
+// type suggests that it can be null. This will not happen in practice, so this
+// makes it a bit easier to work with.
+export default function useColorScheme(): NonNullable<ColorSchemeName> {
+  return _useColorScheme() as NonNullable<ColorSchemeName>;
+}

hooks/useColorScheme.web.ts

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+// useColorScheme from react-native does not support web currently. You can replace
+// this with react-native-appearance if you would like theme support on web.
+export default function useColorScheme() {
+  return 'light';
+}

navigation/BottomTabNavigator.tsx

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+import { Ionicons } from '@expo/vector-icons';
+import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
+import { createStackNavigator } from '@react-navigation/stack';
+import * as React from 'react';
+
+import Colors from '../constants/Colors';
+import useColorScheme from '../hooks/useColorScheme';
+import TabOneScreen from '../screens/TabOneScreen';
+import TabTwoScreen from '../screens/TabTwoScreen';
+import { BottomTabParamList, TabOneParamList, TabTwoParamList } from '../types';
+
+const BottomTab = createBottomTabNavigator<BottomTabParamList>();
+
+export default function BottomTabNavigator() {
+  const colorScheme = useColorScheme();
+
+  return (
+    <BottomTab.Navigator
+      initialRouteName="TabOne"
+      tabBarOptions={{ activeTintColor: Colors[colorScheme].tint }}>
+      <BottomTab.Screen
+        name="TabOne"
+        component={TabOneNavigator}
+        options={{
+          tabBarIcon: ({ color }) => <TabBarIcon name="ios-code" color={color} />,
+        }}
+      />
+      <BottomTab.Screen
+        name="TabTwo"
+        component={TabTwoNavigator}
+        options={{
+          tabBarIcon: ({ color }) => <TabBarIcon name="ios-code" color={color} />,
+        }}
+      />
+    </BottomTab.Navigator>
+  );
+}
+
+// You can explore the built-in icon families and icons on the web at:
+// https://icons.expo.fyi/
+function TabBarIcon(props: { name: React.ComponentProps<typeof Ionicons>['name']; color: string }) {
+  return <Ionicons size={30} style={{ marginBottom: -3 }} {...props} />;
+}
+
+// Each tab has its own navigation stack, you can read more about this pattern here:
+// https://reactnavigation.org/docs/tab-based-navigation#a-stack-navigator-for-each-tab
+const TabOneStack = createStackNavigator<TabOneParamList>();
+
+function TabOneNavigator() {
+  return (
+    <TabOneStack.Navigator>
+      <TabOneStack.Screen
+        name="TabOneScreen"
+        component={TabOneScreen}
+        options={{ headerTitle: 'Tab One Title' }}
+      />
+    </TabOneStack.Navigator>
+  );
+}
+
+const TabTwoStack = createStackNavigator<TabTwoParamList>();
+
+function TabTwoNavigator() {
+  return (
+    <TabTwoStack.Navigator>
+      <TabTwoStack.Screen
+        name="TabTwoScreen"
+        component={TabTwoScreen}
+        options={{ headerTitle: 'Tab Two Title' }}
+      />
+    </TabTwoStack.Navigator>
+  );
+}

navigation/LinkingConfiguration.ts

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+import * as Linking from 'expo-linking';
+
+export default {
+  prefixes: [Linking.makeUrl('/')],
+  config: {
+    screens: {
+      Root: {
+        screens: {
+          TabOne: {
+            screens: {
+              TabOneScreen: 'one',
+            },
+          },
+          TabTwo: {
+            screens: {
+              TabTwoScreen: 'two',
+            },
+          },
+        },
+      },
+      NotFound: '*',
+    },
+  },
+};

navigation/index.tsx

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+import { NavigationContainer, DefaultTheme, DarkTheme } from '@react-navigation/native';
+import { createStackNavigator } from '@react-navigation/stack';
+import * as React from 'react';
+import { ColorSchemeName } from 'react-native';
+
+import NotFoundScreen from '../screens/NotFoundScreen';
+import { RootStackParamList } from '../types';
+import BottomTabNavigator from './BottomTabNavigator';
+import LinkingConfiguration from './LinkingConfiguration';
+
+// If you are not familiar with React Navigation, we recommend going through the
+// "Fundamentals" guide: https://reactnavigation.org/docs/getting-started
+export default function Navigation({ colorScheme }: { colorScheme: ColorSchemeName }) {
+  return (
+    <NavigationContainer
+      linking={LinkingConfiguration}
+      theme={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
+      <RootNavigator />
+    </NavigationContainer>
+  );
+}
+
+// A root stack navigator is often used for displaying modals on top of all other content
+// Read more here: https://reactnavigation.org/docs/modal
+const Stack = createStackNavigator<RootStackParamList>();
+
+function RootNavigator() {
+  return (
+    <Stack.Navigator screenOptions={{ headerShown: false }}>
+      <Stack.Screen name="Root" component={BottomTabNavigator} />
+      <Stack.Screen name="NotFound" component={NotFoundScreen} options={{ title: 'Oops!' }} />
+    </Stack.Navigator>
+  );
+}

package.json

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+{
+  "main": "node_modules/expo/AppEntry.js",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web",
+    "eject": "expo eject",
+    "test": "jest --watchAll"
+  },
+  "jest": {
+    "preset": "jest-expo"
+  },
+  "dependencies": {
+    "@expo/vector-icons": "^12.0.0",
+    "@react-native-community/masked-view": "0.1.10",
+    "@react-navigation/bottom-tabs": "5.11.2",
+    "@react-navigation/native": "~5.8.10",
+    "@react-navigation/stack": "~5.12.8",
+    "expo": "~40.0.0",
+    "expo-asset": "~8.2.1",
+    "expo-constants": "~9.3.0",
+    "expo-font": "~8.4.0",
+    "expo-linking": "~2.0.0",
+    "expo-splash-screen": "~0.8.0",
+    "expo-status-bar": "~1.0.3",
+    "expo-web-browser": "~8.6.0",
+    "react": "16.13.1",
+    "react-dom": "16.13.1",
+    "react-native": "https://github.com/expo/react-native/archive/sdk-40.0.1.tar.gz",
+    "react-native-gesture-handler": "~1.8.0",
+    "react-native-safe-area-context": "3.1.9",
+    "react-native-screens": "~2.15.0",
+    "react-native-web": "~0.13.12"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.9.0",
+    "@types/react": "~16.9.35",
+    "@types/react-native": "~0.63.2",
+    "jest-expo": "~40.0.0",
+    "typescript": "~4.0.0"
+  },
+  "private": true
+}

screens/NotFoundScreen.tsx

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+import { StackScreenProps } from '@react-navigation/stack';
+import * as React from 'react';
+import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+
+import { RootStackParamList } from '../types';
+
+export default function NotFoundScreen({
+  navigation,
+}: StackScreenProps<RootStackParamList, 'NotFound'>) {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>This screen doesn't exist.</Text>
+      <TouchableOpacity onPress={() => navigation.replace('Root')} style={styles.link}>
+        <Text style={styles.linkText}>Go to home screen!</Text>
+      </TouchableOpacity>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+    alignItems: 'center',
+    justifyContent: 'center',
+    padding: 20,
+  },
+  title: {
+    fontSize: 20,
+    fontWeight: 'bold',
+  },
+  link: {
+    marginTop: 15,
+    paddingVertical: 15,
+  },
+  linkText: {
+    fontSize: 14,
+    color: '#2e78b7',
+  },
+});

screens/TabOneScreen.tsx

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+import * as React from 'react';
+import { StyleSheet } from 'react-native';
+
+import EditScreenInfo from '../components/EditScreenInfo';
+import { Text, View } from '../components/Themed';
+
+export default function TabOneScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Tab One</Text>
+      <View style={styles.separator} lightColor="#eee" darkColor="rgba(255,255,255,0.1)" />
+      <EditScreenInfo path="/screens/TabOneScreen.tsx" />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  title: {
+    fontSize: 20,
+    fontWeight: 'bold',
+  },
+  separator: {
+    marginVertical: 30,
+    height: 1,
+    width: '80%',
+  },
+});

screens/TabTwoScreen.tsx

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+import * as React from 'react';
+import { StyleSheet } from 'react-native';
+
+import EditScreenInfo from '../components/EditScreenInfo';
+import { Text, View } from '../components/Themed';
+
+export default function TabTwoScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Tab Two</Text>
+      <View style={styles.separator} lightColor="#eee" darkColor="rgba(255,255,255,0.1)" />
+      <EditScreenInfo path="/screens/TabTwoScreen.tsx" />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  title: {
+    fontSize: 20,
+    fontWeight: 'bold',
+  },
+  separator: {
+    marginVertical: 30,
+    height: 1,
+    width: '80%',
+  },
+});

tsconfig.json

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+{
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "jsx": "react-native",
+    "lib": ["dom", "esnext"],
+    "moduleResolution": "node",
+    "noEmit": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "strict": true
+  }
+}

types.tsx

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+export type RootStackParamList = {
+  Root: undefined;
+  NotFound: undefined;
+};
+
+export type BottomTabParamList = {
+  TabOne: undefined;
+  TabTwo: undefined;
+};
+
+export type TabOneParamList = {
+  TabOneScreen: undefined;
+};
+
+export type TabTwoParamList = {
+  TabTwoScreen: undefined;
+};