fix: resolve JS subclass registered prototypes

Author: DjDeveloperr

NativeScript/ffi/shared/bridge/HostObjects.mm

@@ -1203,24 +1203,7 @@ Value prototypeFunctionForProperty(Runtime& runtime,
       return Value::undefined();
     }
 
-    Value classWrapperValue = bridge_->findObjectExpando(
-        runtime, object_, "__nativeApiClassWrapper");
-    if (!classWrapperValue.isObject()) {
-      classWrapperValue = bridge_->findClassValue(runtime, object_getClass(object_));
-    }
-    if (!classWrapperValue.isObject()) {
-      if (const NativeApiSymbol* symbol =
-              bridge_->findClassForRuntimeClass(object_getClass(object_))) {
-        classWrapperValue = bridge_->findClassValue(
-            runtime, objc_lookUpClass(symbol->runtimeName.c_str()));
-      }
-    }
-    if (!classWrapperValue.isObject()) {
-      return Value::undefined();
-    }
-
-    Object classWrapper = classWrapperValue.asObject(runtime);
-    Value prototypeValue = classWrapper.getProperty(runtime, "prototype");
+    Value prototypeValue = enginePrototypeForObject(runtime);
     if (!prototypeValue.isObject()) {
       return Value::undefined();
     }
@@ -1257,6 +1240,48 @@ Value prototypeFunctionForProperty(Runtime& runtime,
     return Value::undefined();
   }
 
+  Value enginePrototypeForObject(Runtime& runtime) {
+    if (object_ == nil) {
+      return Value::undefined();
+    }
+
+    Value classWrapperValue = bridge_->findObjectExpando(
+        runtime, object_, "__nativeApiClassWrapper");
+    if (!classWrapperValue.isObject()) {
+      classWrapperValue = bridge_->findClassValue(runtime, object_getClass(object_));
+    }
+    if (!classWrapperValue.isObject()) {
+      if (const NativeApiSymbol* symbol =
+              bridge_->findClassForRuntimeClass(object_getClass(object_))) {
+        classWrapperValue = bridge_->findClassValue(
+            runtime, objc_lookUpClass(symbol->runtimeName.c_str()));
+      }
+    }
+    if (classWrapperValue.isObject()) {
+      Object classWrapper = classWrapperValue.asObject(runtime);
+      Value prototypeValue = classWrapper.getProperty(runtime, "prototype");
+      if (prototypeValue.isObject()) {
+        return prototypeValue;
+      }
+    }
+
+    Value prototypeValue =
+        bridge_->findClassPrototype(runtime, object_getClass(object_));
+    if (prototypeValue.isObject()) {
+      return prototypeValue;
+    }
+    if (const NativeApiSymbol* symbol =
+            bridge_->findClassForRuntimeClass(object_getClass(object_))) {
+      prototypeValue = bridge_->findClassPrototype(
+          runtime, objc_lookUpClass(symbol->runtimeName.c_str()));
+      if (prototypeValue.isObject()) {
+        return prototypeValue;
+      }
+    }
+
+    return Value::undefined();
+  }
+
   // Invoke a JS-prototype getter accessor with this instance as the receiver.
   // Sets *found and returns the resolved value.
   Value resolveEnginePrototypeGetter(Runtime& runtime,
@@ -1265,17 +1290,7 @@ Value resolveEnginePrototypeGetter(Runtime& runtime,
     if (object_ == nil || property.empty()) {
       return Value::undefined();
     }
-    Value classWrapperValue =
-        bridge_->findObjectExpando(runtime, object_, "__nativeApiClassWrapper");
-    if (!classWrapperValue.isObject()) {
-      classWrapperValue =
-          bridge_->findClassValue(runtime, object_getClass(object_));
-    }
-    if (!classWrapperValue.isObject()) {
-      return Value::undefined();
-    }
-    Value prototypeValue =
-        classWrapperValue.asObject(runtime).getProperty(runtime, "prototype");
+    Value prototypeValue = enginePrototypeForObject(runtime);
     if (!prototypeValue.isObject()) {
       return Value::undefined();
     }
@@ -1324,17 +1339,7 @@ bool invokeEnginePrototypeSetter(Runtime& runtime, const std::string& property,
     if (object_ == nil || property.empty()) {
       return false;
     }
-    Value classWrapperValue =
-        bridge_->findObjectExpando(runtime, object_, "__nativeApiClassWrapper");
-    if (!classWrapperValue.isObject()) {
-      classWrapperValue =
-          bridge_->findClassValue(runtime, object_getClass(object_));
-    }
-    if (!classWrapperValue.isObject()) {
-      return false;
-    }
-    Value prototypeValue =
-        classWrapperValue.asObject(runtime).getProperty(runtime, "prototype");
+    Value prototypeValue = enginePrototypeForObject(runtime);
     if (!prototypeValue.isObject()) {
       return false;
     }
@@ -1377,17 +1382,7 @@ bool enginePrototypeHasSetter(Runtime& runtime,
     if (object_ == nil || property.empty()) {
       return false;
     }
-    Value classWrapperValue =
-        bridge_->findObjectExpando(runtime, object_, "__nativeApiClassWrapper");
-    if (!classWrapperValue.isObject()) {
-      classWrapperValue =
-          bridge_->findClassValue(runtime, object_getClass(object_));
-    }
-    if (!classWrapperValue.isObject()) {
-      return false;
-    }
-    Value prototypeValue =
-        classWrapperValue.asObject(runtime).getProperty(runtime, "prototype");
+    Value prototypeValue = enginePrototypeForObject(runtime);
     if (!prototypeValue.isObject()) {
       return false;
     }

PROGRESS.md

@@ -17,6 +17,43 @@ TypeScript/UI worklets.
 
 ## Latest Update - 2026-06-30
 
+### 2026-06-30 03:12 EDT - JS subclass accessors use registered class prototype fallback
+
+- Scope check:
+  - Still generic NativeScript runtime behavior required by the RN-module
+    branch. No RNS-specific native implementation and no direct-engine backend
+    refactor work.
+  - Simulator-only rule remains active; no physical devices were used.
+- CI finding:
+  - GitHub Actions run `28425597293` on `353e7274` kept setup, FFI boundary
+    check, native build, CLI build, and macOS tests green.
+  - iOS still had one failure:
+    `ApiTests.js SpecialCaseProperty_When_CustomSelector_ImplementedInJS`.
+  - The failure remained at the final `TNSGetOutput()` assertion, so the values
+    were correct but native getter/setter dispatch still produced repeated JS
+    `getter` logs.
+- Change:
+  - JS-subclass method/getter/setter resolution now shares an
+    `enginePrototypeForObject` helper.
+  - The helper still checks the per-object class-wrapper expando and class
+    wrapper cache, but now also falls back to the registered class prototype
+    (`findClassPrototype`) that `extend()` stores for dynamic subclasses.
+  - This lets JS subclass accessors resolve through their JS prototype before
+    falling back to Objective-C runtime properties even when the wrapper object
+    lookup is unavailable.
+- Verification:
+  - Focused construction/property guard test passed:
+    `node packages/react-native/test/runtime-instance-selector-base-dispatch.test.js`.
+  - Runtime RN JS tests passed:
+    `for f in packages/react-native/test/*.test.js; do node "$f" || exit 1; done`.
+  - `git diff --check` passed.
+  - `npm run check:ffi-boundaries` passed.
+  - Existing generated macOS project compile/link passed with
+    `xcodebuild -project dist/intermediates/macos/NativeScript.xcodeproj ...`.
+- Still next:
+  - Commit/push this prototype-resolver fix and watch fresh PR CI. If iOS goes
+    green, resume the RNS simulator parity sweep from this handoff.
+
 ### 2026-06-30 02:42 EDT - JS subclass setters invoke prototype accessors directly on V8
 
 - Scope check:

packages/react-native/test/runtime-instance-selector-base-dispatch.test.js

@@ -84,6 +84,12 @@ for (const relativePath of [
       guardedIndex < branchIndex,
     `${relativePath}: JS-subclassed property reads should prefer prototype getters before native runtime getters on every backend`,
   );
+  assert(
+    source.includes("Value enginePrototypeForObject(Runtime& runtime)") &&
+      source.includes("bridge_->findClassPrototype(runtime, object_getClass(object_))") &&
+      source.match(/Value prototypeValue = enginePrototypeForObject\(runtime\);/g)?.length >= 4,
+    `${relativePath}: JS-subclassed prototype lookup should use the registered class prototype fallback for methods, getters, and setters`,
+  );
 
   const nilObjectSetIndex = source.indexOf(
     'throw JSError(runtime, "Cannot set property on nil object.");',