chore: experiments app

experiments-app/.gitignore

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+node_modules/
+.expo/
+dist/
+npm-debug.*
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+*.orig.*
+web-build/
+
+# macOS
+.DS_Store
+
+# Temporary files created by Metro to check the health of the file watcher
+.metro-health-check*

experiments-app/.prettierrc.js

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+// added for Jest inline snapshots to not use default Prettier config
+module.exports = {
+  singleQuote: true,
+  trailingComma: "es5"
+}

experiments-app/app.json

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+{
+  "expo": {
+    "name": "experiments-app",
+    "slug": "experiments-app",
+    "version": "1.0.0",
+    "orientation": "portrait",
+    "icon": "./assets/icon.png",
+    "userInterfaceStyle": "light",
+    "splash": {
+      "image": "./assets/splash.png",
+      "resizeMode": "contain",
+      "backgroundColor": "#ffffff"
+    },
+    "assetBundlePatterns": [
+      "**/*"
+    ],
+    "ios": {
+      "supportsTablet": true
+    },
+    "android": {
+      "adaptiveIcon": {
+        "foregroundImage": "./assets/adaptive-icon.png",
+        "backgroundColor": "#ffffff"
+      }
+    },
+    "web": {
+      "favicon": "./assets/favicon.png"
+    }
+  }
+}

experiments-app/babel.config.js

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

experiments-app/index.js

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+import registerRootComponent from 'expo/build/launch/registerRootComponent';
+import App from './src/App';
+
+registerRootComponent(App);

experiments-app/package.json

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+{
+  "name": "experiments-app",
+  "private": true,
+  "description": "Expo app for conducting experiments of React Native behaviour.",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "typecheck": "tsc -noEmit",
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web"
+  },
+  "dependencies": {
+    "@react-navigation/native": "^6.1.6",
+    "@react-navigation/native-stack": "^6.9.12",
+    "add": "^2.0.6",
+    "expo": "~48.0.11",
+    "expo-status-bar": "~1.4.4",
+    "react": "18.2.0",
+    "react-native": "0.71.6",
+    "react-native-safe-area-context": "4.5.0",
+    "react-native-screens": "~3.20.0",
+    "yarn": "^1.22.19"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.20.0",
+    "@types/react": "~18.0.14",
+    "typescript": "^4.9.4"
+  }
+}

experiments-app/src/App.tsx

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+import * as React from 'react';
+import { StatusBar } from 'expo-status-bar';
+import { NavigationContainer } from '@react-navigation/native';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
+import { MainScreen } from './MainScreen';
+import { experiments } from './experiments';
+
+const Stack = createNativeStackNavigator();
+
+export default function App() {
+  return (
+    <NavigationContainer>
+      <Stack.Navigator>
+        <Stack.Screen
+          name="main"
+          component={MainScreen}
+          options={{ title: 'Experiments' }}
+        />
+        {experiments.map((exp) => (
+          <Stack.Screen
+            key={exp.key}
+            name={exp.key}
+            component={exp.component}
+            options={{ title: exp.title }}
+          />
+        ))}
+      </Stack.Navigator>
+      <StatusBar style="auto" />
+    </NavigationContainer>
+  );
+}

experiments-app/src/Experiments/TextInputEventPropagation.tsx

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+import * as React from 'react';
+import { StyleSheet, SafeAreaView, TextInput, Pressable } from 'react-native';
+import { buildEventLogger } from '../utils/helpers';
+
+const handlePressIn = buildEventLogger('TextInput.pressIn');
+const handlePressOut = buildEventLogger('TextInput.pressOut');
+const handleFocus = buildEventLogger('TextInput.focus');
+const handleBlur = buildEventLogger('TextInput.blur');
+const handleChange = buildEventLogger('TextInput.change');
+const handleSubmitEditing = buildEventLogger('TextInput.submitEditing');
+
+const handlePressablePress = buildEventLogger('Pressable.press');
+
+export function TextInputEventPropagation() {
+  const [value, setValue] = React.useState('');
+
+  const handleChangeText = (value: string) => {
+    setValue(value);
+    console.log(`Event: changeText`, value);
+  };
+
+  return (
+    <SafeAreaView style={styles.container}>
+      <Pressable onPress={handlePressablePress}>
+        <TextInput
+          style={styles.textInput}
+          value={value}
+          editable={true}
+          onChangeText={handleChangeText}
+          onPressIn={handlePressIn}
+          onPressOut={handlePressOut}
+          onFocus={handleFocus}
+          onBlur={handleBlur}
+          onChange={handleChange}
+          onSubmitEditing={handleSubmitEditing}
+        />
+      </Pressable>
+    </SafeAreaView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  textInput: {
+    backgroundColor: 'white',
+    margin: 20,
+    padding: 8,
+    fontSize: 18,
+    borderWidth: 1,
+    borderColor: 'grey',
+  },
+});

experiments-app/src/Experiments/TextInputEvents.tsx

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+import * as React from 'react';
+import { StyleSheet, SafeAreaView, TextInput } from 'react-native';
+import { buildEventLogger } from '../utils/helpers';
+
+const handlePressIn = buildEventLogger('pressIn');
+const handlePressOut = buildEventLogger('pressOut');
+const handleFocus = buildEventLogger('focus');
+const handleBlur = buildEventLogger('blur');
+const handleChange = buildEventLogger('change');
+const handleSubmitEditing = buildEventLogger('submitEditing');
+
+export function TextInputEvents() {
+  const [value, setValue] = React.useState('');
+
+  const handleChangeText = (value: string) => {
+    setValue(value);
+    console.log(`Event: changeText`, value);
+  };
+
+  return (
+    <SafeAreaView style={styles.container}>
+      <TextInput
+        style={styles.textInput}
+        value={value}
+        editable={true}
+        onChangeText={handleChangeText}
+        onPressIn={handlePressIn}
+        onPressOut={handlePressOut}
+        onFocus={handleFocus}
+        onBlur={handleBlur}
+        onChange={handleChange}
+        onSubmitEditing={handleSubmitEditing}
+      />
+    </SafeAreaView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  textInput: {
+    backgroundColor: 'white',
+    margin: 20,
+    padding: 8,
+    fontSize: 18,
+    borderWidth: 1,
+    borderColor: 'grey',
+  },
+});

experiments-app/src/MainScreen.tsx

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+import * as React from 'react';
+import {
+  StyleSheet,
+  SafeAreaView,
+  Text,
+  FlatList,
+  Pressable,
+} from 'react-native';
+import { useNavigation } from '@react-navigation/native';
+import { Experiment, experiments } from './experiments';
+
+export function MainScreen() {
+  return (
+    <SafeAreaView style={styles.container}>
+      <FlatList
+        data={experiments}
+        renderItem={({ item }) => <ListItem item={item} />}
+      />
+    </SafeAreaView>
+  );
+}
+
+interface ListItemProps {
+  item: Experiment;
+}
+
+function ListItem({ item }: ListItemProps) {
+  const navigation = useNavigation();
+
+  const handlePress = () => {
+    navigation.navigate(item.key);
+  };
+
+  return (
+    <Pressable style={styles.item} onPress={handlePress}>
+      <Text style={styles.itemTitle}>{item.title}</Text>
+    </Pressable>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  item: {
+    padding: 20,
+  },
+  itemTitle: {
+    fontSize: 20,
+  },
+});

experiments-app/src/experiments.ts

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+import { TextInputEventPropagation } from './experiments/TextInputEventPropagation';
+import { TextInputEvents } from './experiments/TextInputEvents';
+
+export type Experiment = (typeof experiments)[number];
+
+export const experiments = [
+  {
+    key: 'textInputEvents',
+    title: 'TextInput Events',
+    component: TextInputEvents,
+  },
+  {
+    key: 'textInputEventPropagation',
+    title: 'TextInput Event Propagation',
+    component: TextInputEventPropagation,
+  },
+];

experiments-app/src/utils/helpers.ts

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+import { NativeSyntheticEvent } from 'react-native/types';
+
+export function buildEventLogger(name: string) {
+  return (event: NativeSyntheticEvent<unknown>) => {
+    const eventData = event?.nativeEvent ?? event;
+    console.log(`Event: ${name}`, eventData);
+  };
+}

experiments-app/tsconfig.json

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+{
+  "extends": "expo/tsconfig.base",
+  "compilerOptions": {
+    "strict": true
+  }
+}