Declare RCTBundleURLProviderAllowPackagerServerAccess unconditionally

The function is declared only under RCT_DEV_MENU |
RCT_PACKAGER_LOADING_FUNCTIONALITY, so it vanishes in Release and any
out-of-tree caller fails with "call to undeclared function" (broke
expo/expo Release CI, worked around in expo/expo#47688). Mirror the
RCTDevLoadingViewSetEnabled shape: unconditional declaration and
definition, every read of the flag stays gated, so builds without
packager support get a no-op instead of a compile error.

Author: ramonclaudio

packages/react-native/React/Base/RCTBundleURLProvider.h

@@ -14,15 +14,15 @@
 RCT_EXTERN NSString *_Nonnull const RCTBundleURLProviderUpdatedNotification;
 RCT_EXTERN const NSUInteger kRCTBundleURLProviderDefaultPort;
 
-#if RCT_DEV_MENU | RCT_PACKAGER_LOADING_FUNCTIONALITY
 /**
  * Allow/disallow accessing the packager server for various runtime scenario.
  * For instance, if a test run should never access the packager, disable it
  * by calling this function before initializing React Native (RCTBridge etc).
- * By default the access is enabled.
+ * By default the access is enabled. When packager support is compiled out
+ * (neither RCT_DEV_MENU nor RCT_PACKAGER_LOADING_FUNCTIONALITY is set),
+ * calling this function is a no-op.
  */
 RCT_EXTERN void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed);
-#endif
 
 NS_ASSUME_NONNULL_BEGIN
 

packages/react-native/React/Base/RCTBundleURLProvider.mm

@@ -19,13 +19,14 @@
 
 const NSUInteger kRCTBundleURLProviderDefaultPort = RCT_METRO_PORT;
 
-#if RCT_DEV_MENU | RCT_PACKAGER_LOADING_FUNCTIONALITY
+// Declared unconditionally so out-of-tree callers link in every configuration,
+// same shape as RCTDevLoadingViewSetEnabled. Reads stay gated below, so this is
+// a no-op when packager support is compiled out.
 static BOOL kRCTAllowPackagerAccess = YES;
 void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed)
 {
   kRCTAllowPackagerAccess = allowed;
 }
-#endif
 static NSString *const kRCTPackagerSchemeKey = @"RCT_packager_scheme";
 static NSString *const kRCTJsLocationKey = @"RCT_jsLocation";
 static NSString *const kRCTEnableDevKey = @"RCT_enableDev";