Is a nullable

pkgs/ffigen/CHANGELOG.md

@@ -21,6 +21,8 @@
   change to something more sensible.
 - __Breaking change__: Deleted the config option `Output.sort`. Sorting is now
   always enabled.
+- Fix(https://github.com/dart-lang/native/issues/2877) 
+  such that ObjCObject `isA` now accepts a nullable `ObjCObject?` and returns `false` when called with `null`, aligning its behavior with Dart’s `is`operator. 
 
 ## 20.1.1
 

pkgs/ffigen/example/objective_c/avf_audio_bindings.dart

@@ -563,11 +563,13 @@ extension type AVAudioPlayer._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [AVAudioPlayer].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_AVAudioPlayer,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_AVAudioPlayer,
+        );
 
   /// alloc
   static AVAudioPlayer alloc() {

pkgs/ffigen/lib/src/code_generator/objc_interface.dart

@@ -152,7 +152,7 @@ ${generateInstanceMethodBindings(w, this)}
 
     s.write('''
   /// Returns whether [obj] is an instance of [$name].
-  static bool isA($wrapObjType obj) => $isKindOfClass;
+  static bool isA($wrapObjType? obj) => obj == null ? false : $isKindOfClass;
 ''');
 
     s.write(generateStaticMethodBindings(w, this));

pkgs/ffigen/test/native_objc_test/is_instance_test.dart

@@ -48,5 +48,11 @@ void main() {
       expect(IsInstanceChildClass.isA(base), isFalse);
       expect(IsInstanceChildClass.isA(child), isTrue);
     });
+
+    test('Null input', () {
+      expect(IsInstanceBaseClass.isA(null), isFalse);
+      expect(IsInstanceChildClass.isA(null), isFalse);
+      expect(IsInstanceUnrelatedClass.isA(null), isFalse);
+    });
   });
 }

pkgs/objective_c/CHANGELOG.md

@@ -1,3 +1,6 @@
+## 9.4.0
+- Fix (https://github.com/dart-lang/native/issues/2877) such that all occurances of ObjCObject `isA` now accepts a nullable `ObjCObject?` and returns `false` when input is`null`
+
 ## 9.3.0
 - `autoReleasePool` now returns the value produced by its callback.