diff --git a/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h b/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
index 873ce233db..437b6550f8 100644
--- a/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
+++ b/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
@@ -202,6 +202,11 @@ namespace JS {
       NSString *cancelButtonKey() const;
       NSString *destructiveButtonKey() const;
       NSString *keyboardType() const;
+#if TARGET_OS_OSX // [TODO(macOS ISS#2323203)
+      bool critical() const;
+      bool modal() const;
+     folly::Optional<facebook::react::LazyVector<id<NSObject>>> defaultInputs() const;
+#endif // ]TODO(macOS ISS#2323203)b
 
       Args(NSDictionary *const v) : _v(v) {}
     private:
@@ -3040,6 +3045,23 @@ inline NSString *JS::NativeAlertManager::Args::keyboardType() const
   id const p = _v[@"keyboardType"];
   return RCTBridgingToString(p);
 }
+#if TARGET_OS_OSX // [TODO(macOS ISS#2323203)
+inline bool JS::NativeAlertManager::Args::critical() const
+{
+  id const p = _v[@"critical"];
+  return RCTBridgingToBool(p);
+}
+inline bool JS::NativeAlertManager::Args::modal() const
+{
+  id const p = _v[@"modal"];
+  return RCTBridgingToBool(p);
+}
+inline folly::Optional<facebook::react::LazyVector<id<NSObject>>> JS::NativeAlertManager::Args::defaultInputs() const
+{
+  id const p = _v[@"defaultInputs"];
+  return RCTBridgingToOptionalVec(p, ^id<NSObject>(id itemValue_0) { return itemValue_0; });
+}
+#endif // ]TODO(macOS ISS#2323203)b
 inline bool JS::NativeAnimatedModule::EndResult::finished() const
 {
   id const p = _v[@"finished"];
diff --git a/Libraries/Image/RCTImageView.mm b/Libraries/Image/RCTImageView.mm
index 8f82b6687c..177992d727 100644
--- a/Libraries/Image/RCTImageView.mm
+++ b/Libraries/Image/RCTImageView.mm
@@ -187,8 +187,8 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
     image = [image imageWithRenderingMode:_renderingMode];
   }
 #else // [TODO(macOS ISS#2323203)
-  if ((_renderingMode == UIImageRenderingModeAlwaysTemplate) != image.template) {
-    image.template = (_renderingMode == UIImageRenderingModeAlwaysTemplate);
+  if ((_renderingMode == UIImageRenderingModeAlwaysTemplate) != [image isTemplate]) {
+    [image setTemplate:(_renderingMode == UIImageRenderingModeAlwaysTemplate)];
   }
 #endif // ]TODO(macOS ISS#2323203)
 
diff --git a/Libraries/LinkingIOS/React-RCTLinking.podspec b/Libraries/LinkingIOS/React-RCTLinking.podspec
index 577350a435..ee64763e8f 100644
--- a/Libraries/LinkingIOS/React-RCTLinking.podspec
+++ b/Libraries/LinkingIOS/React-RCTLinking.podspec
@@ -31,6 +31,10 @@ Pod::Spec.new do |s|
   s.compiler_flags         = folly_compiler_flags + ' -Wno-nullability-completeness'
   s.source                 = source
   s.source_files           = "*.{m,mm}"
+# [TODO(macOS ISS#2323203)
+  s.osx.exclude_files      = "RCTLinkingManager.mm"
+  s.osx.source_files       = "macos/RCTLinkingManager.m"
+# ]TODO(macOS ISS#2323203)
   s.preserve_paths         = "package.json", "LICENSE", "LICENSE-docs"
   s.header_dir             = "RCTLinking"
   s.pod_target_xcconfig    = {
diff --git a/Libraries/Network/React-RCTNetwork.podspec b/Libraries/Network/React-RCTNetwork.podspec
index dc90bc9abb..2e575fec72 100644
--- a/Libraries/Network/React-RCTNetwork.podspec
+++ b/Libraries/Network/React-RCTNetwork.podspec
@@ -37,7 +37,7 @@ Pod::Spec.new do |s|
                                "CLANG_CXX_LANGUAGE_STANDARD" => "c++14",
                                "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/Folly\""
                              }
-  s.frameworks             = "MobileCoreServices"
+	s.ios.frameworks         = "MobileCoreServices" # TODO(macOS GH#214) - Restrict to iOS
 
   s.dependency "Folly", folly_version
   s.dependency "FBReactNativeSpec", version
diff --git a/Libraries/PushNotificationIOS/RCTPushNotificationManager.mm b/Libraries/PushNotificationIOS/RCTPushNotificationManager.mm
index e631bdb6da..e517c518e5 100644
--- a/Libraries/PushNotificationIOS/RCTPushNotificationManager.mm
+++ b/Libraries/PushNotificationIOS/RCTPushNotificationManager.mm
@@ -45,11 +45,9 @@ RCT_ENUM_CONVERTER(NSCalendarUnit,
 
 @end
 
-#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 @interface RCTPushNotificationManager () <NativePushNotificationManagerIOSSpec>
 @property (nonatomic, strong) NSMutableDictionary *remoteNotificationCallbacks;
 @end
-#endif // TODO(macOS ISS#2323203)
 
 @implementation RCTConvert (UILocalNotification)
 
@@ -466,18 +464,14 @@ RCT_EXPORT_METHOD(requestPermissions:(JS::NativePushNotificationManagerIOS::Spec
   [RCTSharedApplication() registerUserNotificationSettings:notificationSettings];
 #else // [TODO(macOS ISS#2323203)
   NSRemoteNotificationType types = NSRemoteNotificationTypeNone;
-  if (permissions) {
-    if ([RCTConvert BOOL:permissions[@"alert"]]) {
-      types |= NSRemoteNotificationTypeAlert;
-    }
-    if ([RCTConvert BOOL:permissions[@"badge"]]) {
-      types |= NSRemoteNotificationTypeBadge;
-    }
-    if ([RCTConvert BOOL:permissions[@"sound"]]) {
-      types |= NSRemoteNotificationTypeSound;
-    }
-  } else {
-    types = NSRemoteNotificationTypeAlert | NSRemoteNotificationTypeBadge | NSRemoteNotificationTypeSound;
+  if (permissions.alert()) {
+    types |= NSRemoteNotificationTypeAlert;
+  }
+  if (permissions.badge()) {
+    types |= NSRemoteNotificationTypeBadge;
+  }
+  if (permissions.badge()) {
+    types |= NSRemoteNotificationTypeSound;
   }
   [RCTSharedApplication() registerForRemoteNotificationTypes:types];
 #endif // ]TODO(macOS ISS#2323203)
diff --git a/Libraries/Text/TextInput/RCTBackedTextInputDelegateAdapter.m b/Libraries/Text/TextInput/RCTBackedTextInputDelegateAdapter.m
index 8833dfb56a..b8e4d70881 100644
--- a/Libraries/Text/TextInput/RCTBackedTextInputDelegateAdapter.m
+++ b/Libraries/Text/TextInput/RCTBackedTextInputDelegateAdapter.m
@@ -103,6 +103,7 @@ static void *TextFieldSelectionObservingContext = &TextFieldSelectionObservingCo
   [attributedString replaceCharactersInRange:range withString:newText];
   [_backedTextInputView setAttributedText:[attributedString copy]];
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   // Setting selection to the end of the replaced text.
   UITextPosition *position =
     [_backedTextInputView positionFromPosition:_backedTextInputView.beginningOfDocument
@@ -110,6 +111,7 @@ static void *TextFieldSelectionObservingContext = &TextFieldSelectionObservingCo
   [_backedTextInputView setSelectedTextRange:[_backedTextInputView textRangeFromPosition:position toPosition:position]
                               notifyDelegate:YES];
 
+#endif // TODO(macOS ISS#2323203)
   [self textFieldDidChange];
 
   return NO;
@@ -325,12 +327,14 @@ static void *TextFieldSelectionObservingContext = &TextFieldSelectionObservingCo
   [attributedString replaceCharactersInRange:range withString:newText];
   [_backedTextInputView setAttributedText:[attributedString copy]];
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   // Setting selection to the end of the replaced text.
   UITextPosition *position =
     [_backedTextInputView positionFromPosition:_backedTextInputView.beginningOfDocument
                                         offset:(range.location + newText.length)];
   [_backedTextInputView setSelectedTextRange:[_backedTextInputView textRangeFromPosition:position toPosition:position]
                               notifyDelegate:YES];
+#endif // TODO(macOS ISS#2323203)
 
   [self textViewDidChange:_backedTextInputView];
 
diff --git a/Libraries/Text/TextInput/Singleline/RCTUITextField.m b/Libraries/Text/TextInput/Singleline/RCTUITextField.m
index 3151e2b20e..68338ba5bd 100644
--- a/Libraries/Text/TextInput/Singleline/RCTUITextField.m
+++ b/Libraries/Text/TextInput/Singleline/RCTUITextField.m
@@ -230,7 +230,9 @@ static RCTUIColor *defaultPlaceholderTextColor()
 - (void)setDefaultTextAttributes:(NSDictionary<NSAttributedStringKey, id> *)defaultTextAttributes
 {
   _defaultTextAttributes = defaultTextAttributes;
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   [super setDefaultTextAttributes:defaultTextAttributes];
+#endif // TODO(macOS ISS#2323203)
   [self _updatePlaceholder];
 }
 
@@ -241,8 +243,13 @@ static RCTUIColor *defaultPlaceholderTextColor()
 
 - (void)_updatePlaceholder
 {
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder ?: @""
                                                                attributes:[self _placeholderTextAttributes]];
+#else // [TODO(macOS ISS#2323203)
+  self.placeholderAttributedString = [[NSAttributedString alloc] initWithString:self.placeholder ?: @""
+																	 attributes:[self _placeholderTextAttributes]];
+#endif // ]TODO(macOS ISS#2323203)
 }
 
 - (BOOL)isEditable
@@ -287,6 +294,9 @@ static RCTUIColor *defaultPlaceholderTextColor()
   self.attributedText = originalText;
 }
 
+#endif // ]TODO(macOS ISS#2323203)
+
+
 #pragma mark - Placeholder
 
 - (NSDictionary<NSAttributedStringKey, id> *)_placeholderTextAttributes
@@ -309,6 +319,8 @@ static RCTUIColor *defaultPlaceholderTextColor()
 
 #pragma mark - Context Menu
 
+#if !TARGET_OS_OSX // [TODO(macOS ISS#2323203)
+
 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
 {
   if (_contextMenuHidden) {
diff --git a/RNTester/Podfile.lock b/RNTester/Podfile.lock
index a972080ce7..a23e0d7e30 100644
--- a/RNTester/Podfile.lock
+++ b/RNTester/Podfile.lock
@@ -466,8 +466,8 @@ SPEC CHECKSUMS:
   RCTTypeSafety: ede90b8a90e0dd629d19984788d434ae23828a64
   React: b8f3da30d525b068a54ac964abe933c8ca617dce
   React-ART: d45ff8a3eb41b11513259371573fe77100d64b79
-  React-Core: bd1d31a06447d4fad4e657c6c2d99e006e6ae92e
-  React-CoreModules: 23c507e49f1c010f776e7e2b7f258b73835bde41
+  React-Core: 33a4fc04428a5b8cb2dd73bd9ffed77e09f9fad2
+  React-CoreModules: 03d31048f14293cca7076cfa5bc4ca474c128a5d
   React-cxxreact: c190cf3bfc4cf67f5578bd7d1875b1e027d218c7
   React-jsi: 1e2cdb8a09f8dac172b58882e11229af86d4f708
   React-jsiexecutor: 3d3137d20b4b1df8d2f23fc51315922fd46d13d3
@@ -476,8 +476,8 @@ SPEC CHECKSUMS:
   React-RCTAnimation: b65edfef9cfd54789b7ab5aab9974425dc67a983
   React-RCTBlob: 01d56c23e12074993ef274a55d2c7f9d0e39dc2a
   React-RCTImage: 4515f301f1812f7bda3a7e0b5473be237c8cec60
-  React-RCTLinking: dad12f504ec7f0539384514ecb8b83ab837acda4
-  React-RCTNetwork: c5e806d73a29181a210d92f3772b255474404aa3
+  React-RCTLinking: 0b6246bfbc4e6e01ebe5cca631ea2917e2ad66d2
+  React-RCTNetwork: 14c6996d9c4695bd03ff94bf1aee8d2dd4eb9000
   React-RCTPushNotification: 8006d2b1b0d3e1972cae2c97e6708f17ff8479d8
   React-RCTSettings: 0bc4c586dd2841e6764092ff67081d1047bef8ce
   React-RCTTest: 537fa13cbf082a64b29fa815dde8a1e03b0e9b9b
diff --git a/RNTester/RNTesterPods.xcodeproj/project.pbxproj b/RNTester/RNTesterPods.xcodeproj/project.pbxproj
index 68f2c64b1d..a231082130 100644
--- a/RNTester/RNTesterPods.xcodeproj/project.pbxproj
+++ b/RNTester/RNTesterPods.xcodeproj/project.pbxproj
@@ -1813,6 +1813,27 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
+				HEADER_SEARCH_PATHS = (
+					"$(inherited)",
+					"\"${PODS_ROOT}/Headers/Public\"",
+					"\"${PODS_ROOT}/Headers/Public/DoubleConversion\"",
+					"\"${PODS_ROOT}/Headers/Public/FBLazyVector\"",
+					"\"${PODS_ROOT}/Headers/Public/FBReactNativeSpec\"",
+					"\"${PODS_ROOT}/Headers/Public/RCTRequired\"",
+					"\"${PODS_ROOT}/Headers/Public/RCTTypeSafety\"",
+					"\"${PODS_ROOT}/Headers/Public/React-Core\"",
+					"\"${PODS_ROOT}/Headers/Public/React-RCTTest\"",
+					"\"${PODS_ROOT}/Headers/Public/React-RCTText\"",
+					"\"${PODS_ROOT}/Headers/Public/React-cxxreact\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsi\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsiexecutor\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsinspector\"",
+					"\"${PODS_ROOT}/Headers/Public/ReactCommon\"",
+					"\"${PODS_ROOT}/Headers/Public/Yoga\"",
+					"\"${PODS_ROOT}/Headers/Public/glog\"",
+					"\"$(PODS_ROOT)/Headers/Private/React-Core\"",
+					"\"$(PODS_ROOT)/Folly\"",
+				);
 				INFOPLIST_FILE = "RNTester-macOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -1847,6 +1868,27 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
+				HEADER_SEARCH_PATHS = (
+					"$(inherited)",
+					"\"${PODS_ROOT}/Headers/Public\"",
+					"\"${PODS_ROOT}/Headers/Public/DoubleConversion\"",
+					"\"${PODS_ROOT}/Headers/Public/FBLazyVector\"",
+					"\"${PODS_ROOT}/Headers/Public/FBReactNativeSpec\"",
+					"\"${PODS_ROOT}/Headers/Public/RCTRequired\"",
+					"\"${PODS_ROOT}/Headers/Public/RCTTypeSafety\"",
+					"\"${PODS_ROOT}/Headers/Public/React-Core\"",
+					"\"${PODS_ROOT}/Headers/Public/React-RCTTest\"",
+					"\"${PODS_ROOT}/Headers/Public/React-RCTText\"",
+					"\"${PODS_ROOT}/Headers/Public/React-cxxreact\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsi\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsiexecutor\"",
+					"\"${PODS_ROOT}/Headers/Public/React-jsinspector\"",
+					"\"${PODS_ROOT}/Headers/Public/ReactCommon\"",
+					"\"${PODS_ROOT}/Headers/Public/Yoga\"",
+					"\"${PODS_ROOT}/Headers/Public/glog\"",
+					"\"$(PODS_ROOT)/Headers/Private/React-Core\"",
+					"\"$(PODS_ROOT)/Folly\"",
+				);
 				INFOPLIST_FILE = "RNTester-macOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
diff --git a/React-Core.podspec b/React-Core.podspec
index 5fd9d05ab7..762f947ab6 100644
--- a/React-Core.podspec
+++ b/React-Core.podspec
@@ -63,12 +63,11 @@ Pod::Spec.new do |s|
     # [TODO(macOS ISS#2323203)
                                 "**/MacOS/*"
     ss.osx.exclude_files      = "React/Modules/RCTRedBoxExtraDataViewController.{h,m}",
-                                "React/Profiler/{RCTFPSGraph,RCTPerfMonitor}.*",
                                 "React/Profiler/RCTProfileTrampoline-{arm,arm64,i386}.S",
                                 "React/Base/RCTKeyCommands.*",
                                 "React/Base/RCTTV*.*",
-                                "React/Base/RCTReloadCommand.*",
-                                "React/Views/{RCTModal*,RCTMasked*,RCTTV*,RCTRefreshControl*,RCTWrapperViewController}.*",
+                                "React/Views/{RCTModal*,RCTMasked*,RCTTV*,RCTWrapperViewController}.*",
+                                "React/Views/RefreshControl/*",
                                 "React/Views/SafeAreaView/*"
     # ]TODO(macOS ISS#2323203)
 
diff --git a/React/Base/RCTBridge.m b/React/Base/RCTBridge.m
index c6261a3e26..8edbea05b4 100644
--- a/React/Base/RCTBridge.m
+++ b/React/Base/RCTBridge.m
@@ -366,10 +366,12 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   // Sanitize the bundle URL
   _bundleURL = [RCTConvert NSURL:_bundleURL.absoluteString];
 
+#if !TARGET_OS_OSX
   RCTExecuteOnMainQueue(^{
     RCTRegisterReloadCommandListener(self);
     RCTReloadCommandSetBundleURL(self->_bundleURL);
   });
+#endif // !TARGET_OS_OSX
 
   self.batchedBridge = [[bridgeClass alloc] initWithParentBridge:self];
   [self.batchedBridge start];
diff --git a/React/Base/RCTReloadCommand.m b/React/Base/RCTReloadCommand.m
index 43faf6e0bf..bd63549d2c 100644
--- a/React/Base/RCTReloadCommand.m
+++ b/React/Base/RCTReloadCommand.m
@@ -8,7 +8,9 @@
 #import "RCTReloadCommand.h"
 
 #import "RCTAssert.h"
+#if !TARGET_OS_OSX
 #import "RCTKeyCommands.h"
+#endif
 #import "RCTUtils.h"
 
 static NSHashTable<id<RCTReloadListener>> *listeners;
@@ -28,7 +30,7 @@ void RCTRegisterReloadCommandListener(id<RCTReloadListener> listener)
   if (!listeners) {
     listeners = [NSHashTable weakObjectsHashTable];
   }
-#if RCT_DEV
+#if RCT_DEV && !TARGET_OS_OSX
   RCTAssertMainQueue(); // because registerKeyCommandWithInput: must be called on the main thread
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
diff --git a/React/Base/RCTUIKit.h b/React/Base/RCTUIKit.h
index 8a8f6e5e2a..a0479a343f 100644
--- a/React/Base/RCTUIKit.h
+++ b/React/Base/RCTUIKit.h
@@ -322,6 +322,9 @@ NS_INLINE NSEdgeInsets UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat botto
 // UIImage
 @compatibility_alias UIImage NSImage;
 
+#ifdef __cplusplus
+extern "C"
+#endif
 CGFloat UIImageGetScale(NSImage *image);
 
 CGImageRef UIImageGetCGImageRef(NSImage *image);
diff --git a/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingView.mm b/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingView.mm
index 38e21b76f8..45b17317d1 100644
--- a/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingView.mm
+++ b/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingView.mm
@@ -211,6 +211,7 @@ RCT_NOT_IMPLEMENTED(- (nullable instancetype)initWithCoder:(NSCoder *)coder)
 
 #pragma mark - UITraitCollection updates
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 - (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
 {
   [super traitCollectionDidChange:previousTraitCollection];
@@ -220,6 +221,7 @@ RCT_NOT_IMPLEMENTED(- (nullable instancetype)initWithCoder:(NSCoder *)coder)
                                                       RCTUserInterfaceStyleDidChangeNotificationTraitCollectionKey: self.traitCollection,
                                                     }];
 }
+#endif // TODO(macOS ISS#2323203)
 
 #pragma mark - Private stuff
 
diff --git a/React/CoreModules/CoreModulesPlugins.mm b/React/CoreModules/CoreModulesPlugins.mm
index dfd937c538..149a1970b5 100644
--- a/React/CoreModules/CoreModulesPlugins.mm
+++ b/React/CoreModules/CoreModulesPlugins.mm
@@ -18,8 +18,10 @@
 
 Class RCTCoreModulesClassProvider(const char *name) {
   static std::unordered_map<std::string, Class (*)(void)> sCoreModuleClassMap = {
+#if !TARGET_OS_OSX // TODO(macOS) = Do we need these?
     {"AccessibilityManager", RCTAccessibilityManagerCls},
     {"Appearance", RCTAppearanceCls},
+#endif // TODO(macOS)
     {"DeviceInfo", RCTDeviceInfoCls},
     {"ExceptionsManager", RCTExceptionsManagerCls},
     {"PlatformConstants", RCTPlatformCls},
@@ -33,11 +35,15 @@ Class RCTCoreModulesClassProvider(const char *name) {
     {"StatusBarManager", RCTStatusBarManagerCls},
     {"KeyboardObserver", RCTKeyboardObserverCls},
     {"AppState", RCTAppStateCls},
+#if !TARGET_OS_OSX // TODO(macOS) = Do we need these?
     {"PerfMonitor", RCTPerfMonitorCls},
+#endif // TODO(macOS)
     {"DevMenu", RCTDevMenuCls},
     {"DevSettings", RCTDevSettingsCls},
     {"RedBox", RCTRedBoxCls},
+#if !TARGET_OS_OSX // TODO(macOS) = Do we need these?
     {"LogBox", RCTLogBoxCls},
+#endif // TODO(macOS)
     {"TVNavigationEventEmitter", RCTTVNavigationEventEmitterCls},
     {"WebSocketExecutor", RCTWebSocketExecutorCls},
     {"WebSocketModule", RCTWebSocketModuleCls},
diff --git a/React/CoreModules/RCTActionSheetManager.mm b/React/CoreModules/RCTActionSheetManager.mm
index 4d11c79568..42660c3ade 100644
--- a/React/CoreModules/RCTActionSheetManager.mm
+++ b/React/CoreModules/RCTActionSheetManager.mm
@@ -37,7 +37,7 @@ NSSharingServicePickerDelegate
 #if TARGET_OS_OSX // [TODO(macOS ISS#2323203)
   NSArray<NSSharingService*> *_excludedActivities;
   NSString *_sharingSubject;
-  RCTResponseErrorBlock _failureCallback;
+  RCTResponseSenderBlock _failureCallback;
   RCTResponseSenderBlock _successCallback;
 #endif // ]TODO(macOS ISS#2323203)
 }
@@ -99,9 +99,11 @@ RCT_EXPORT_METHOD(showActionSheetWithOptions:(JS::NativeActionSheetManager::Spec
     destructiveButtonIndices = @[destructiveButtonIndex];
 #endif // TODO(macOS ISS#2323203)
   }
+
+  NSNumber *anchor = [RCTConvert NSNumber:options.anchor() ? @(*options.anchor()) : nil];
+
 #if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   UIViewController *controller = RCTPresentedViewController();
-  NSNumber *anchor = [RCTConvert NSNumber:options.anchor() ? @(*options.anchor()) : nil];
   UIColor *tintColor = [RCTConvert UIColor:options.tintColor() ? @(*options.tintColor()) : nil];
 
   if (controller == nil) {
@@ -261,26 +263,27 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(JS::NativeActionSheetManager:
 
   [self presentViewController:shareController onParentViewController:controller anchorViewTag:anchorViewTag];
 #else // [TODO(macOS ISS#2323203)
+  NSArray *excludedActivityTypes = RCTConvertOptionalVecToArray(options.excludedActivityTypes(), ^id(NSString *element) { return element; });
   NSMutableArray<NSSharingService*> *excludedTypes = [NSMutableArray array];
-  for (NSString *excludeActivityType in [RCTConvert NSStringArray:options[@"excludedActivityTypes"]]) {
+  for (NSString *excludeActivityType in excludedActivityTypes) {
     NSSharingService *sharingService = [NSSharingService sharingServiceNamed:excludeActivityType];
     if (sharingService) {
       [excludedTypes addObject:sharingService];
     }
   }
   _excludedActivities = excludedTypes.copy;
-  _sharingSubject = [RCTConvert NSString:options[@"subject"]];
+  _sharingSubject = options.subject();
   _failureCallback = failureCallback;
   _successCallback = successCallback;
   RCTPlatformView *view = nil;
-  NSNumber *anchorViewTag = [RCTConvert NSNumber:options[@"anchor"]];
+  NSNumber *anchorViewTag = [RCTConvert NSNumber:options.anchor() ? @(*options.anchor()) : nil];
   if (anchorViewTag) {
     view = [self.bridge.uiManager viewForReactTag:anchorViewTag];
   }
   NSView *contentView = view ?: NSApp.keyWindow.contentView;
   NSSharingServicePicker *picker = [[NSSharingServicePicker alloc] initWithItems:items];
   picker.delegate = self;
-  [picker showRelativeToRect:contentView.bounds ofView:contentView preferredEdge:0];
+  [picker showRelativeToRect:contentView.bounds ofView:contentView preferredEdge:NSRectEdgeMinX];
 #endif // ]TODO(macOS ISS#2323203)
 }
 
@@ -310,7 +313,7 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(JS::NativeActionSheetManager:
   
 - (void)sharingService:(NSSharingService *)sharingService didFailToShareItems:(NSArray *)items error:(NSError *)error
 {
-  _failureCallback(error);
+  _failureCallback(@[RCTJSErrorFromNSError(error)]);
 }
 
 - (void)sharingService:(NSSharingService *)sharingService didShareItems:(NSArray *)items
diff --git a/React/CoreModules/RCTAlertManager.mm b/React/CoreModules/RCTAlertManager.mm
index 6066f3b22e..3485e70673 100644
--- a/React/CoreModules/RCTAlertManager.mm
+++ b/React/CoreModules/RCTAlertManager.mm
@@ -87,9 +87,9 @@ RCT_EXPORT_METHOD(alertWithArgs:(JS::NativeAlertManager::Args &)args
   NSString *destructiveButtonKey = [RCTConvert NSString:args.destructiveButtonKey()];
   UIKeyboardType keyboardType = [RCTConvert UIKeyboardType:args.keyboardType()];
 #else // [TODO(macOS ISS#2323203)
-  BOOL critical = [RCTConvert BOOL:args[@"critical"]];
-  BOOL modal = [RCTConvert BOOL:args[@"modal"]];
-  NSArray<NSDictionary *> *defaultInputs = [RCTConvert NSDictionaryArray:args[@"defaultInputs"]];
+  BOOL critical = args.critical();
+  BOOL modal = args.modal();
+  NSArray<NSDictionary *> *defaultInputs = [RCTConvert NSDictionaryArray:RCTConvertOptionalVecToArray(args.defaultInputs(), ^id(id<NSObject> element) { return element; })];
 #endif // ]TODO(macOS ISS#2323203)
 
   if (!title && !message) {
diff --git a/React/CoreModules/RCTDevMenu.mm b/React/CoreModules/RCTDevMenu.mm
index e5928c8504..4ed6090e51 100644
--- a/React/CoreModules/RCTDevMenu.mm
+++ b/React/CoreModules/RCTDevMenu.mm
@@ -267,7 +267,6 @@ RCT_EXPORT_MODULE()
                                       [RCTPresentedViewController() presentViewController:alertController
                                                                                  animated:YES
                                                                                completion:NULL];
-                                    }]];
 #else // [TODO(macOS ISS#2323203)
                                       NSAlert *alert = [[NSAlert alloc] init];
                                       [alert setMessageText:@"Remote JS Debugger Unavailable"];
@@ -276,6 +275,7 @@ RCT_EXPORT_MODULE()
                                       [alert setAlertStyle:NSWarningAlertStyle];
                                       [alert beginSheetModalForWindow:[NSApp keyWindow] completionHandler:nil];
 #endif // ]TODO(macOS ISS#2323203)
+                                    }]];
     } else {
       [items addObject:[RCTDevMenuItem
                            buttonItemWithTitleBlock:^NSString * {
@@ -293,7 +293,7 @@ RCT_EXPORT_MODULE()
     if (devSettings.isNuclideDebuggingAvailable && !devSettings.isDebuggingRemotely) {
       [items addObject:[RCTDevMenuItem buttonItemWithTitle:@"Debug with Nuclide"
                                                    handler:^{
-#if RCT_ENABLE_INSPECTOR
+#if RCT_ENABLE_INSPECTOR && !TARGET_OS_OSX // TODO(macOS ISS#2323203) - No RCTPresentedViewController on macOS
                                                      [RCTInspectorDevServerHelper
                                                          attachDebugger:@"ReactNative"
                                                           withBundleURL:bridge.bundleURL
diff --git a/React/CoreModules/RCTDeviceInfo.h b/React/CoreModules/RCTDeviceInfo.h
index c879321f2c..c03322da90 100644
--- a/React/CoreModules/RCTDeviceInfo.h
+++ b/React/CoreModules/RCTDeviceInfo.h
@@ -7,6 +7,15 @@
 
 #import <React/RCTBridge.h>
 
+#if !TARGET_OS_OSX // [TODO(macOS ISS#2323203) - RCTExportedDimensions is needed in RCTRootContentView
+NSDictionary *RCTExportedDimensions(RCTBridge *bridge);
+#else
+#ifdef __cplusplus
+extern "C"
+#endif
+NSDictionary *RCTExportedDimensions(RCTPlatformView *rootView);
+#endif // ]TODO(macOS ISS#2323203)
+
 @interface RCTDeviceInfo : NSObject <RCTBridgeModule>
 
 @end
diff --git a/React/CoreModules/RCTRedBox.mm b/React/CoreModules/RCTRedBox.mm
index a13fb504c5..9a3a985009 100644
--- a/React/CoreModules/RCTRedBox.mm
+++ b/React/CoreModules/RCTRedBox.mm
@@ -27,6 +27,7 @@
 
 @class RCTRedBoxWindow;
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 @interface UIButton (RCTRedBox)
 
 @property (nonatomic) RCTRedBoxButtonPressHandler rct_handler;
@@ -61,6 +62,7 @@
 }
 
 @end
+#endif // TODO(macOS ISS#2323203)
 
 @protocol RCTRedBoxWindowActionDelegate <NSObject>
 
@@ -571,7 +573,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
   });
 }
 
-- (void)showErrorMessage:(NSString *)message withStack:(NSArray<RCTJSStackFrame *> *)stack isUpdate:(BOOL)isUpdate
+- (void)showErrorMessage:(NSString *)message withStack:(NSArray<RCTJSStackFrame *> *)stack isUpdate:(BOOL)isUpdate errorCookie:(int)errorCookie
 {
   // Show if this is a new message, or if we're updating the previous message
   if ((!_visible && !isUpdate) || (_visible && isUpdate && [_lastErrorMessage isEqualToString:message])) {
diff --git a/React/CoreModules/RCTStatusBarManager.mm b/React/CoreModules/RCTStatusBarManager.mm
index 2f74040625..4d11bc8f3a 100644
--- a/React/CoreModules/RCTStatusBarManager.mm
+++ b/React/CoreModules/RCTStatusBarManager.mm
@@ -12,7 +12,7 @@
 #import <React/RCTLog.h>
 #import <React/RCTUtils.h>
 
-#if !TARGET_OS_TV
+#if !TARGET_OS_TV && !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 #import <FBReactNativeSpec/FBReactNativeSpec.h>
 
 @implementation RCTConvert (UIStatusBar)
@@ -59,7 +59,7 @@ RCT_ENUM_CONVERTER(
 @end
 #endif
 
-#if !TARGET_OS_TV
+#if !TARGET_OS_TV && !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 
 @interface RCTStatusBarManager() <NativeStatusBarManagerIOSSpec>
 @end
@@ -93,7 +93,7 @@ RCT_EXPORT_MODULE()
   return @[ @"statusBarFrameDidChange", @"statusBarFrameWillChange" ];
 }
 
-#if !TARGET_OS_TV
+#if !TARGET_OS_TV && !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 
 - (void)startObserving
 {
diff --git a/React/CoreModules/React-CoreModules.podspec b/React/CoreModules/React-CoreModules.podspec
index ded5ff39a4..86096d40c6 100644
--- a/React/CoreModules/React-CoreModules.podspec
+++ b/React/CoreModules/React-CoreModules.podspec
@@ -30,6 +30,10 @@ Pod::Spec.new do |s|
   s.compiler_flags         = folly_compiler_flags + ' -Wno-nullability-completeness'
   s.source                 = source
   s.source_files           = "**/*.{c,m,mm,cpp}"
+  # [TODO(macOS ISS#2323203)
+                             "**/MacOS/*"
+  s.osx.exclude_files     =  "{RCTAppearance,RCTLogBox,RCTFPSGraph,RCTPerfMonitor,RCTPlatform}.*"
+  # ]TODO(macOS ISS#2323203)
   s.header_dir             = "CoreModules"
   s.pod_target_xcconfig    = {
                                "USE_HEADERMAP" => "YES",
diff --git a/React/Views/RCTSegmentedControl.m b/React/Views/RCTSegmentedControl.m
index 5e52c82eb4..801be6c84e 100644
--- a/React/Views/RCTSegmentedControl.m
+++ b/React/Views/RCTSegmentedControl.m
@@ -52,7 +52,8 @@
   self.selectedSegmentIndex = selectedIndex; // TODO(macOS ISS#2323203)
 }
 
-- (void)setTintColor:(RCTUIColor *)tintColor // TODO(macOS ISS#2323203)
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203) - no concept of tintColor on macOS
+- (void)setTintColor:(UIColor *)tintColor // TODO(macOS ISS#2323203)
 {
   [super setTintColor:tintColor];
 #if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && defined(__IPHONE_13_0) && \
@@ -66,6 +67,7 @@
   }
 #endif
 }
+#endif // TODO(macOS ISS#2323203)
 
 - (void)didChange
 {
diff --git a/React/Views/RCTSlider.m b/React/Views/RCTSlider.m
index f89b16de5c..a857bd8b98 100644
--- a/React/Views/RCTSlider.m
+++ b/React/Views/RCTSlider.m
@@ -327,6 +327,7 @@
 #endif // ]TODO(macOS ISS#2323203)
 }
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203) - accessibility on macOS is on the NSCell rather than the NSControl
 - (void)accessibilityIncrement
 {
   [super accessibilityIncrement];
@@ -346,5 +347,6 @@
     });
   }
 }
+#endif // TODO(macOS ISS#2323203)
 
 @end
diff --git a/ReactCommon/turbomodule/samples/platform/ios/RCTSampleTurboModule.mm b/ReactCommon/turbomodule/samples/platform/ios/RCTSampleTurboModule.mm
index 9ab9d18675..484d1f4adb 100644
--- a/ReactCommon/turbomodule/samples/platform/ios/RCTSampleTurboModule.mm
+++ b/ReactCommon/turbomodule/samples/platform/ios/RCTSampleTurboModule.mm
@@ -45,8 +45,13 @@ RCT_EXPORT_MODULE()
 
 - (NSDictionary *)getConstants
 {
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   UIScreen *mainScreen = UIScreen.mainScreen;
   CGSize screenSize = mainScreen.bounds.size;
+#else // [TODO(macOS ISS#2323203)
+  NSScreen *mainScreen = NSScreen.mainScreen;
+  CGSize screenSize = mainScreen.frame.size;
+#endif // ]TODO(macOS ISS#2323203)
 
   return @{
     @"const1" : @YES,