create stub nativescript_init() method

Author: shirakaba

packages/jsi/android/src/main/java/com/nativescriptjsi/NativescriptJsiModule.kt

@@ -9,6 +9,11 @@ class NativescriptJsiModule(reactContext: ReactApplicationContext) :
     return a * b
   }
 
+  override fun nativescript_init(metadata_path: String?) {
+    // NativeScript JSI is not currently supported on Android. For now, we just
+    // no-op.
+  }
+
   companion object {
     const val NAME = NativeNativescriptJsiSpec.NAME
   }

packages/jsi/apple/NativescriptJsi.mm

@@ -2,15 +2,19 @@
 
 @implementation NativescriptJsi
 - (NSNumber *)multiply:(double)a b:(double)b {
-    NSNumber *result = @(a * b);
+  NSNumber *result = @(a * b);
 
-    return result;
+  return result;
+}
+
+- (void)nativescript_init:(NSString *)metadata_path {
+  // TODO
 }
 
 - (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:
     (const facebook::react::ObjCTurboModule::InitParams &)params
 {
-    return std::make_shared<facebook::react::NativeNativescriptJsiSpecJSI>(params);
+  return std::make_shared<facebook::react::NativeNativescriptJsiSpecJSI>(params);
 }
 
 + (NSString *)moduleName

packages/jsi/example/src/App.tsx

@@ -1,12 +1,22 @@
-import { Text, View, StyleSheet } from 'react-native';
-import { multiply } from 'nativescript-jsi';
+import { Text, View, StyleSheet, Button } from 'react-native';
+import { multiply, nativescript_init } from 'nativescript-jsi';
 
 const result = multiply(3, 7);
 
 export default function App() {
   return (
     <View style={styles.container}>
       <Text>Result: {result}</Text>
+      <Button
+        title="Init NativeScript"
+        onPress={() => {
+          try {
+            nativescript_init('abc');
+          } catch (error) {
+            console.log('Error initialising NativeScript:', error);
+          }
+        }}
+      />
     </View>
   );
 }

packages/jsi/src/NativeNativescriptJsi.ts

@@ -2,6 +2,7 @@ import { TurboModuleRegistry, type TurboModule } from 'react-native';
 
 export interface Spec extends TurboModule {
   multiply(a: number, b: number): number;
+  nativescript_init(metadata_path: string | null): void;
 }
 
 export default TurboModuleRegistry.getEnforcing<Spec>('NativescriptJsi');

packages/jsi/src/index.tsx

@@ -3,3 +3,17 @@ import NativescriptJsi from './NativeNativescriptJsi';
 export function multiply(a: number, b: number): number {
   return NativescriptJsi.multiply(a, b);
 }
+
+/**
+ * Initialise NativeScript JSI. This installs its bindings to the Objective-C
+ * runtime. It will bind to whatever APIs are referenced in in the metadata
+ * bundle.
+ *
+ * @platform Only currently supported on iOS and macOS. Will no-op on Android.
+ *
+ * @param metadata_path A path to the metadata bundle (or null, if you'd
+ * rather use metadata_ptr).
+ */
+export function nativescript_init(metadata_path: string | null): void {
+  return NativescriptJsi.nativescript_init(metadata_path);
+}