[ReactNative] Fix dev menu customization when JS fails to load

React/Base/RCTBatchedBridge.m

@@ -219,6 +219,9 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
       [_frameUpdateObservers addObject:moduleData];
     }
   }
+
+  [[NSNotificationCenter defaultCenter] postNotificationName:RCTDidCreateNativeModules
+                                                      object:self];
 }
 
 - (void)initJS

React/Base/RCTBridge.h

@@ -33,6 +33,11 @@ RCT_EXTERN NSString *const RCTJavaScriptDidLoadNotification;
  */
 RCT_EXTERN NSString *const RCTJavaScriptDidFailToLoadNotification;
 
+/**
+ * This notification fires when the bridge created all registered native modules
+ */
+RCT_EXTERN NSString *const RCTDidCreateNativeModules;
+
 /**
  * This block can be used to instantiate modules that require additional
  * init parameters, or additional configuration prior to being used.

React/Base/RCTBridge.m

@@ -20,6 +20,7 @@
 NSString *const RCTReloadNotification = @"RCTReloadNotification";
 NSString *const RCTJavaScriptDidLoadNotification = @"RCTJavaScriptDidLoadNotification";
 NSString *const RCTJavaScriptDidFailToLoadNotification = @"RCTJavaScriptDidFailToLoadNotification";
+NSString *const RCTDidCreateNativeModules = @"RCTDidCreateNativeModules";
 
 @class RCTBatchedBridge;