diff --git a/RNTester/Podfile.lock b/RNTester/Podfile.lock
index 9383de51ea..487ff013c0 100644
--- a/RNTester/Podfile.lock
+++ b/RNTester/Podfile.lock
@@ -348,34 +348,34 @@ EXTERNAL SOURCES:
 SPEC CHECKSUMS:
   boost-for-react-native: a110407d9db2642fd2e1bcd7c5a51c81f2521dc9
   DoubleConversion: a1bc12a74baa397a2609e0f10e19b8062d864053
-  FBLazyVector: c1a4e0c7c94510ed45096fd47fce665424d8c00a
-  FBReactNativeSpec: 9ae539b7e366b481cd690a3241bdd677af33bde1
+  FBLazyVector: f0e0df84578f80a66fd746f051e447b860b47bf3
+  FBReactNativeSpec: d3e3e305a38696069a21420e6c2dd79d067c73a9
   Folly: feff29ba9d0b7c2e4f793a94942831d6cc5bbad7
   glog: b3f6d74f3e2d33396addc0ee724d2b2b79fc3e00
-  RCTRequired: 313773d7d9e5e30b68fba394a49755ef2cbe2741
-  RCTTypeSafety: cdd9e2617c3692199c3bc5da791730472d440ae2
-  React: 151e5b0a6dbee207a711306a2ab3cf6b2d3059ea
-  React-ART: 7f68acd3818c6fe7e6430e0c0ef009383e68aee3
-  React-Core: fb668c18bbeb6812d55e86019e1bec201c3a059d
-  React-CoreModules: 396acc98714e3af464f1153252f8dfdb8507d016
-  React-cxxreact: 30dd117c1143c92c3cbb74b761bb44edbad801bd
-  React-jsi: c38f0d09305a4afa22e5d54f3a1622dd1d6be644
-  React-jsiexecutor: 72399803b25bafec90791d56c21f20f0240d32ce
-  React-jsinspector: 3513ab27e5587f87ee8e295c4a2b54485424547a
-  React-RCTActionSheet: 07e9fac815d5399b12a7f79a5593ce23135bcd1f
-  React-RCTAnimation: 3dd140a28b092e8a2562bcda3dfecf30ae07f064
-  React-RCTBlob: 602e263532c6bbfa9a6feedaac177b13eeeb8ff5
-  React-RCTImage: 54934276dea15f319e768b45f711e07009a2fdba
-  React-RCTLinking: 86c0eb052a95ae447e0d2b666ba6523b26ca58e1
-  React-RCTNetwork: 0b8a8d1e18a66dafced8c2cfc369a53ac68dce34
-  React-RCTPushNotification: dfce10fd71a0d171a64668156f4d8356ee1a9e82
-  React-RCTSettings: 59554f1a1a762c845997e380b83fd8041e29facd
-  React-RCTTest: 9ab0918fa68e349e0d0347a81e3404104037d88d
-  React-RCTText: 00a855d78dcaa9b992ff12e6fd282d654e8e300b
-  React-RCTVibration: 67d42e894e29edf4b33ba729e9f5885c04e41303
-  ReactCommon: 1ec21feb4a8d44be66747bd06134f587b8ae499f
-  Yoga: 22ba96ecfbe709bfef9b658a631013af9f6ebd45
+  RCTRequired: a573cb908cfc02fdaaf6e63e7e1c55e8153fc977
+  RCTTypeSafety: d58e22c29cb25122c11172a3121484a517b48ca5
+  React: 2b0d09dac43fd5a442dd412b2a07dcba5038b223
+  React-ART: 8b1fba341468349688d8c055d7305ee2b9fb0ac9
+  React-Core: 118f5e89b085aa6be453da4c31e30fd38c7bd7e3
+  React-CoreModules: 1eccf9a46ef23e9a31fc445a01225ee0a2a05936
+  React-cxxreact: 4c23c5df9b8d304a7daf572152bd0155ba38ca00
+  React-jsi: 54f8e7208d44c3f4cacbdee580c8bff7dc9a6655
+  React-jsiexecutor: 42cb111d20bee4f18a994f6c33a9973f3157da65
+  React-jsinspector: 60e026ea8263b4dcea8df64b12fac06642f6fdda
+  React-RCTActionSheet: 99c8723f606fd1b55cd5a3b794fd86d8b14677a5
+  React-RCTAnimation: bd0ee82d577e61e2c485903bf387d36294d954ac
+  React-RCTBlob: 20e60087c155b0f3bd0b2401ea43ffdd4a625648
+  React-RCTImage: 9afd4553833185d6099e82c990ff604ebc0a3804
+  React-RCTLinking: 9c03f63acb0da803efc3218509743e63d22256c0
+  React-RCTNetwork: 0893c8dff3c0cbf2bdb61444e9aae842f7824399
+  React-RCTPushNotification: 416b0e93705ca217c63e1ecd6d6b494281bea375
+  React-RCTSettings: 1778d7ecf07703bbfc7f565eac820447355513c0
+  React-RCTTest: 53a3563d3bf54d4342dd599518748f62cd0def14
+  React-RCTText: 8d87a5dcd9a50bfef8ae61d4a6da95e39dc9d2b3
+  React-RCTVibration: b7b18d0cf7cffa5ba48a006b13e5cac337b61701
+  ReactCommon: a309e51dec398e5095e9e07410fa25d9ef0fd4c2
+  Yoga: 135abc3b97d777f821297e5dff54e5cec85568f8
 
-PODFILE CHECKSUM: 9bfdd5bfee61814974e42ca8fda603a38c2e241e
+PODFILE CHECKSUM: 2bf56de39dc7e153b4f1637e0f4874f2591fc55a
 
 COCOAPODS: 1.8.4
diff --git a/React-Core.podspec b/React-Core.podspec
index ecc14336dd..b69127dea4 100644
--- a/React-Core.podspec
+++ b/React-Core.podspec
@@ -64,7 +64,6 @@ Pod::Spec.new do |s|
     # [TODO(macOS ISS#2323203)
                                 "**/MacOS/*"
     ss.osx.exclude_files      = "React/Modules/RCTRedBoxExtraDataViewController.{h,m}",
-                                "React/UIUtils/*",
                                 "React/Profiler/{RCTFPSGraph,RCTPerfMonitor}.*",
                                 "React/Profiler/RCTProfileTrampoline-{arm,arm64,i386}.S",
                                 "React/Base/RCTKeyCommands.*",
diff --git a/React/Modules/RCTDeviceInfo.m b/React/Modules/RCTDeviceInfo.m
index 25e7d012a2..78a8d4d8bf 100644
--- a/React/Modules/RCTDeviceInfo.m
+++ b/React/Modules/RCTDeviceInfo.m
@@ -10,9 +10,7 @@
 #import "RCTAccessibilityManager.h"
 #import "RCTAssert.h"
 #import "RCTEventDispatcher.h"
-#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 #import "RCTUIUtils.h"
-#endif // TODO(macOS ISS#2323203)
 #import "RCTUtils.h"
 #import <React/RCTUIKit.h> // TODO(macOS ISS#2323203)
 #import "UIView+React.h" // TODO(macOS ISS#2323203)
@@ -98,6 +96,10 @@ NSDictionary *RCTExportedDimensions(RCTPlatformView *rootView)
 
 #if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
   RCTDimensions dimensions = RCTGetDimensions(bridge.accessibilityManager.multiplier);
+#else // [TODO(macOS ISS#2323203)
+  RCTDimensions dimensions = RCTGetDimensions(rootView);
+#endif // ]TODO(macOS ISS#2323203)
+
   typeof (dimensions.window) window = dimensions.window;
   NSDictionary<NSString *, NSNumber *> *dimsWindow = @{
       @"width": @(window.width),
@@ -116,32 +118,6 @@ NSDictionary *RCTExportedDimensions(RCTPlatformView *rootView)
       @"window": dimsWindow,
       @"screen": dimsScreen
   };
-#else // [TODO(macOS ISS#2323203)
-	if (rootView != nil) {
-		NSWindow *window = rootView.window;
-		if (window != nil) {
-			NSSize size = rootView.bounds.size;
-			return @{
-				@"window": @{
-					@"width": @(size.width),
-					@"height": @(size.height),
-					@"scale": @(window.backingScaleFactor),
-				},
-        @"rootTag" : rootView.reactTag,
-			};
-		}
-	}
-
-  // We don't have a root view or window yet so make something up
-  NSScreen *screen = [NSScreen screens].firstObject;
-  return @{
-      @"window": @{
-        @"width": @(screen.frame.size.width),
-        @"height": @(screen.frame.size.height),
-        @"scale": @(screen.backingScaleFactor),
-      },
-  };
-#endif // ]TODO(macOS ISS#2323203)
 }
 
 - (void)dealloc
diff --git a/React/UIUtils/RCTUIUtils.h b/React/UIUtils/RCTUIUtils.h
index 3abee752ae..c1c4ff006e 100644
--- a/React/UIUtils/RCTUIUtils.h
+++ b/React/UIUtils/RCTUIUtils.h
@@ -22,11 +22,17 @@ typedef struct {
   } window, screen;
 } RCTDimensions;
 extern __attribute__((visibility("default")))
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 RCTDimensions RCTGetDimensions(CGFloat fontScale);
+#else // [TODO(macOS ISS#2323203)
+RCTDimensions RCTGetDimensions(RCTPlatformView *rootView);
+#endif // ]TODO(macOS ISS#2323203)
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 // Get font size multiplier for font base size (Large) by content size category
 extern __attribute__((visibility("default")))
 CGFloat RCTGetMultiplierForContentSizeCategory(UIContentSizeCategory category);
+#endif // TODO(macOS ISS#2323203)
 
 #ifdef __cplusplus
 }
diff --git a/React/UIUtils/RCTUIUtils.m b/React/UIUtils/RCTUIUtils.m
index 961c9426e3..3818ed78b8 100644
--- a/React/UIUtils/RCTUIUtils.m
+++ b/React/UIUtils/RCTUIUtils.m
@@ -9,6 +9,7 @@
 
 #import "RCTUtils.h"
 
+#if !TARGET_OS_OSX // TODO(macOS ISS#2323203)
 RCTDimensions RCTGetDimensions(CGFloat fontScale)
 {
   UIScreen *mainScreen = UIScreen.mainScreen;
@@ -61,3 +62,46 @@ CGFloat RCTGetMultiplierForContentSizeCategory(UIContentSizeCategory category)
   double value = multipliers[category].doubleValue;
   return value > 0.0 ? value : 1.0;
 }
+
+#else // [TODO(macOS ISS#2323203)
+
+RCTDimensions RCTGetDimensions(RCTPlatformView *rootView) {
+  RCTDimensions dimensions = {
+    { 0, 0, 0, /*fontScale*/ 1 },
+    { 0, 0, 0, /*fontScale*/ 1 }
+  };
+  NSScreen *screen = nil;
+  NSWindow *window = nil;
+  NSSize size;
+  if (rootView != nil) {
+    window = [rootView window];
+    size = [rootView frame].size;
+  } else {
+    // We don't have a root view so fall back to the app's key window
+    window = [NSApp keyWindow];
+    size = [window frame].size;
+  }
+
+  if (window != nil) {
+    screen = [window screen];
+    dimensions.window.width = size.width;
+    dimensions.window.height = size.height;
+    dimensions.window.scale = [window backingScaleFactor];
+  } else {
+    // We don't have a window yet so make something up
+    screen = [NSScreen mainScreen];
+    NSSize screenSize = [screen frame].size;
+    dimensions.window.width = screenSize.width;
+    dimensions.window.height = screenSize.height;
+    dimensions.window.scale = [screen backingScaleFactor];
+  }
+
+  NSSize screenSize = [screen frame].size;
+  dimensions.screen.width = screenSize.width;
+  dimensions.screen.height = screenSize.height;
+  dimensions.screen.scale = [screen backingScaleFactor];
+
+  return dimensions;
+}
+
+#endif // ]TODO(macOS ISS#2323203)
diff --git a/scripts/react-native-xcode.sh b/scripts/react-native-xcode.sh
index 31a87ed36a..a1590f3e8e 100755
--- a/scripts/react-native-xcode.sh
+++ b/scripts/react-native-xcode.sh
@@ -32,7 +32,7 @@ fi
 
 case "$CONFIGURATION" in
   *Debug*)
-    if [[ "$PLATFORM_NAME" == *simulator ]]; then
+    if [[ "$PLATFORM_NAME" == *simulator || "$PLATFORM_NAME" == macosx ]]; then
       if [[ "$FORCE_BUNDLING" ]]; then
         echo "FORCE_BUNDLING enabled; continuing to bundle."
       else