Add explicit destructor

android/src/main/java/xyz/twenty_two/react_native/LibportalReactNativeModule.kt

@@ -11,6 +11,7 @@ import com.facebook.react.bridge.WritableNativeMap
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.launch
 
 import xyz.twenty_two.PortalSdk
@@ -19,7 +20,7 @@ import xyz.twenty_two.GenerateMnemonicWords
 class LibportalReactNativeModule(reactContext: ReactApplicationContext) :
   ReactContextBaseJavaModule(reactContext) {
 
-  val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
+  var scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
   var instance: PortalSdk? = null
 
   override fun getName(): String {
@@ -28,10 +29,15 @@ class LibportalReactNativeModule(reactContext: ReactApplicationContext) :
 
   @ReactMethod
   fun constructor(useFastOps: Boolean, promise: Promise) {
-    if (instance == null) {
-      instance = PortalSdk(useFastOps)
-      promise.resolve(null)
-    }
+    scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
+    instance = PortalSdk(useFastOps)
+    promise.resolve(null)
+  }
+
+  @ReactMethod
+  fun destructor() {
+    scope.cancel()
+    instance = null
   }
 
   @ReactMethod

ios/LibportalReactNative.mm

@@ -6,6 +6,8 @@ RCT_EXTERN_METHOD(constructor: (BOOL)useFastOps
                  withResolver:(RCTPromiseResolveBlock)resolve
                  withRejecter:(RCTPromiseRejectBlock)reject)
 
+RCT_EXTERN_METHOD(destructor)
+
 RCT_EXTERN_METHOD(poll: (RCTPromiseResolveBlock)resolve
                  withRejecter:(RCTPromiseRejectBlock)reject)
 

ios/LibportalReactNative.swift

@@ -29,6 +29,8 @@ class LibportalReactNative: NSObject {
         self.sdk = PortalSdk(useFastOps: useFastOps)
         resolve(nil)
     }
+
+    @objc func destructor() -> Void {}
     
     @objc func poll(_ resolve: @escaping RCTPromiseResolveBlock, withRejecter reject: @escaping RCTPromiseRejectBlock) -> Void {
         Task {

src/index.tsx

@@ -23,6 +23,10 @@ export class PortalSdk {
       .catch((e: any) => console.warn(e))
   }
 
+  destroy() {
+    LibportalReactNative.destructor()
+  }
+
   poll(): Promise<NfcOut> {
     return LibportalReactNative.poll()
   }