update RN to 0.70 (untested)

ios/.xcode.env

@@ -0,0 +1,11 @@
+
+# This `.xcode.env` file is versioned and is used to source the environment
+# used when running script phases inside Xcode.
+# To customize your local environment, you can create an `.xcode.env.local`
+# file that is not versioned.
+# NODE_BINARY variable contains the PATH to the node executable.
+#
+# Customize the NODE_BINARY variable here.
+# For example, to use nvm with brew, add the following line
+# . "$(brew --prefix nvm)/nvm.sh" --no-use
+export NODE_BINARY=$(command -v node)

ios/Podfile

@@ -13,9 +13,13 @@ target 'app' do
 
   use_react_native!(
     :path => config[:reactNativePath],
-    # to enable hermes on iOS, change `false` to `true` and then install pods
-    :hermes_enabled => flags[:hermes_enabled],
+        # Hermes is now enabled by default. Disable by setting this flag to false.
+    # Upcoming versions of React Native may rely on get_default_flags(), but
+    # we make it explicit here to aid in the React Native upgrade process.
+    :hermes_enabled => true,
     :fabric_enabled => flags[:fabric_enabled],
+
+    :flipper_configuration => FlipperConfiguration.enabled,
     # An absolute path to your application root.
     :app_path => "#{Pod::Config.instance.installation_root}/.."
   )
@@ -25,14 +29,13 @@ target 'app' do
     # Pods for testing
   end
 
-  # Enables Flipper.
-  #
-  # Note that if you have use_frameworks! enabled, Flipper will not work and
-  # you should disable the next line.
-  #use_flipper!()
-
   post_install do |installer|
-    react_native_post_install(installer)
+    react_native_post_install(
+      installer,
+      # Set `mac_catalyst_enabled` to `true` in order to apply patches
+      # necessary for Mac Catalyst builds
+      :mac_catalyst_enabled => false
+    )
     __apply_Xcode_12_5_M1_post_install_workaround(installer)
 
     # iOS fix

ios/app.xcodeproj/project.pbxproj

@@ -264,7 +264,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "set -e\n\nexport NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh\n";
+			shellScript = "set -e\n\nWITH_ENVIRONMENT=\"../node_modules/react-native/scripts/xcode/with-environment.sh\"\nREACT_NATIVE_XCODE=\"../node_modules/react-native/scripts/react-native-xcode.sh\"\n\n/bin/sh -c \"$WITH_ENVIRONMENT $REACT_NATIVE_XCODE\"\n";
 		};
 		8DC349844744C81F79F94A1E /* [CP] Copy Pods Resources */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -405,7 +405,7 @@
 					"$(inherited)",
 				);
 				INFOPLIST_FILE = appTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -430,7 +430,7 @@
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				COPY_PHASE_STRIP = NO;
 				INFOPLIST_FILE = appTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -552,7 +552,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					/usr/lib/swift,
 					"$(inherited)",
@@ -616,7 +616,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.4;
 				LD_RUNPATH_SEARCH_PATHS = (
 					/usr/lib/swift,
 					"$(inherited)",

ios/app/AppDelegate.mm

@@ -22,6 +22,8 @@
 
 #import <react/config/ReactNativeConfig.h>
 
+static NSString *const kRNConcurrentRoot = @"concurrentRoot";
+
 @interface AppDelegate () <RCTCxxBridgeDelegate, RCTTurboModuleManagerDelegate> {
   RCTTurboModuleManager *_turboModuleManager;
   RCTSurfacePresenterBridgeAdapter *_bridgeAdapter;
@@ -47,7 +49,8 @@
   bridge.surfacePresenter = _bridgeAdapter.surfacePresenter;
 #endif
 
-  UIView *rootView = RCTAppSetupDefaultRootView(bridge, @"xyz.blueskyweb.app", nil);
+  NSDictionary *initProps = [self prepareInitialProps];
+  UIView *rootView = RCTAppSetupDefaultRootView(bridge, @"RnDiffApp", initProps);
 
   if (@available(iOS 13.0, *)) {
     rootView.backgroundColor = [UIColor systemBackgroundColor];
@@ -67,6 +70,25 @@
   return YES;
 }
 
+/// This method controls whether the `concurrentRoot`feature of React18 is turned on or off.
+///
+/// @see: https://reactjs.org/blog/2022/03/29/react-v18.html
+/// @note: This requires to be rendering on Fabric (i.e. on the New Architecture).
+/// @return: `true` if the `concurrentRoot` feture is enabled. Otherwise, it returns `false`.
+- (BOOL)concurrentRootEnabled
+{
+  // Switch this bool to turn on and off the concurrent root
+  return true;
+}
+- (NSDictionary *)prepareInitialProps
+{
+  NSMutableDictionary *initProps = [NSMutableDictionary new];
+#ifdef RCT_NEW_ARCH_ENABLED
+  initProps[kRNConcurrentRoot] = @([self concurrentRootEnabled]);
+#endif
+  return initProps;
+}
+
 - (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
 {
 #if DEBUG