Example of calling swift code from RN

App.tsx

@@ -1,12 +1,13 @@
 import { NewAppScreen } from '@react-native/new-app-screen'
 import { useEffect, useState } from 'react'
-import { StatusBar, Text, StyleSheet, useColorScheme, ScrollView } from 'react-native'
+import { StatusBar, Text, StyleSheet, useColorScheme, ScrollView, Button, Alert } from 'react-native'
 import { NativeEventEmitter, NativeModules } from 'react-native'
 
-const { Emitter } = NativeModules
+const { Emitter, TestingServiceModule } = NativeModules
 
 import { requireNativeComponent } from 'react-native'
 import type { StyleProp, ViewStyle } from 'react-native'
+
 type CustomButtonProps = {
   style?: StyleProp<ViewStyle>
 }
@@ -15,9 +16,23 @@ const BaseButton = requireNativeComponent<CustomButtonProps>('BaseButton')
 
 export default function App() {
   const isDarkMode = useColorScheme() === 'dark'
-  const [message, setMessage] = useState(null)
+  const [message, setMessage] = useState<string|null>(null)
   const [color, setColor] = useState("#FFF")
   
+
+  const onPress = async () => {
+    if (!TestingServiceModule?.greet) {
+      Alert.alert('Module not found', 'MyNativeModule is not linked or not exported.')
+      return
+    }
+    try {
+      const result = await TestingServiceModule.greet('John')
+      setMessage(result);
+    } catch (e) {
+      //Alert.alert('Error', String(e?.message ?? e))
+    }
+  }
+
   useEffect(() => {
     const emitter = new NativeEventEmitter(Emitter);
     const subscription = emitter.addListener('onMessage', (event) => {
@@ -28,6 +43,14 @@ export default function App() {
           setColor("#00F")
         }
       }
+
+      TestingServiceModule.greet('John')
+        .then((message: string) => {
+          setMessage(message)
+        })
+        .catch((error: string) => {
+          console.error(error);
+        });
     })
 
     return () => {
@@ -41,6 +64,7 @@ export default function App() {
       <Text>{message ?? 'Waiting for message...'}</Text>
       <CustomButton style={{ height: 200 }} />
       <BaseButton style={{ height: 200 }} />
+      <Button title="Call Swift greet()" onPress={onPress} />
     </ScrollView>
   );
 }