[Config] Conditionally mark closures as Sendable for Xcode 16

Author: ncooke3

FirebaseRemoteConfig/Sources/Public/FirebaseRemoteConfig/FIRRemoteConfig.h

@@ -223,6 +223,22 @@ NS_SWIFT_NAME(RemoteConfig)
 - (void)ensureInitializedWithCompletionHandler:
     (void (^_Nonnull)(NSError *_Nullable initializationError))completionHandler;
 #pragma mark - Fetch
+
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 180000)
+/// Fetches Remote Config data with a callback. Call `activate()` to make fetched data
+/// available to your app.
+///
+/// Note: This method uses a Firebase Installations token to identify the app instance, and once
+/// it's called, it periodically sends data to the Firebase backend. (see
+/// `Installations.authToken(completion:)`).
+/// To stop the periodic sync, call `Installations.delete(completion:)`
+/// and avoid calling this method again.
+///
+/// @param completionHandler Fetch operation callback with status and error parameters.
+- (void)fetchWithCompletionHandler:
+    (void (^_Nullable NS_SWIFT_SENDABLE)(FIRRemoteConfigFetchStatus status,
+                                         NSError *_Nullable error))completionHandler;
+#else
 /// Fetches Remote Config data with a callback. Call `activate()` to make fetched data
 /// available to your app.
 ///
@@ -235,7 +251,27 @@ NS_SWIFT_NAME(RemoteConfig)
 /// @param completionHandler Fetch operation callback with status and error parameters.
 - (void)fetchWithCompletionHandler:(void (^_Nullable)(FIRRemoteConfigFetchStatus status,
                                                       NSError *_Nullable error))completionHandler;
+#endif
 
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 180000)
+/// Fetches Remote Config data and sets a duration that specifies how long config data lasts.
+/// Call `activateWithCompletion:` to make fetched data available to your app.
+///
+/// Note: This method uses a Firebase Installations token to identify the app instance, and once
+/// it's called, it periodically sends data to the Firebase backend. (see
+/// `Installations.authToken(completion:)`).
+/// To stop the periodic sync, call `Installations.delete(completion:)`
+/// and avoid calling this method again.
+///
+/// @param expirationDuration  Override the (default or optionally set `minimumFetchInterval`
+/// property in RemoteConfigSettings) `minimumFetchInterval` for only the current request, in
+/// seconds. Setting a value of 0 seconds will force a fetch to the backend.
+/// @param completionHandler   Fetch operation callback with status and error parameters.
+- (void)fetchWithExpirationDuration:(NSTimeInterval)expirationDuration
+                  completionHandler:(void (^_Nullable NS_SWIFT_SENDABLE)(
+                                        FIRRemoteConfigFetchStatus status,
+                                        NSError *_Nullable error))completionHandler;
+#else
 /// Fetches Remote Config data and sets a duration that specifies how long config data lasts.
 /// Call `activateWithCompletion:` to make fetched data available to your app.
 ///
@@ -252,7 +288,23 @@ NS_SWIFT_NAME(RemoteConfig)
 - (void)fetchWithExpirationDuration:(NSTimeInterval)expirationDuration
                   completionHandler:(void (^_Nullable)(FIRRemoteConfigFetchStatus status,
                                                        NSError *_Nullable error))completionHandler;
+#endif
 
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 180000)
+/// Fetches Remote Config data and if successful, activates fetched data. Optional completion
+/// handler callback is invoked after the attempted activation of data, if the fetch call succeeded.
+///
+/// Note: This method uses a Firebase Installations token to identify the app instance, and once
+/// it's called, it periodically sends data to the Firebase backend. (see
+/// `Installations.authToken(completion:)`).
+/// To stop the periodic sync, call `Installations.delete(completion:)`
+/// and avoid calling this method again.
+///
+/// @param completionHandler Fetch operation callback with status and error parameters.
+- (void)fetchAndActivateWithCompletionHandler:
+    (void (^_Nullable NS_SWIFT_SENDABLE)(FIRRemoteConfigFetchAndActivateStatus status,
+                                         NSError *_Nullable error))completionHandler;
+#else
 /// Fetches Remote Config data and if successful, activates fetched data. Optional completion
 /// handler callback is invoked after the attempted activation of data, if the fetch call succeeded.
 ///
@@ -266,14 +318,23 @@ NS_SWIFT_NAME(RemoteConfig)
 - (void)fetchAndActivateWithCompletionHandler:
     (void (^_Nullable)(FIRRemoteConfigFetchAndActivateStatus status,
                        NSError *_Nullable error))completionHandler;
+#endif
 
 #pragma mark - Apply
 
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 180000)
+/// Applies Fetched Config data to the Active Config, causing updates to the behavior and appearance
+/// of the app to take effect (depending on how config data is used in the app).
+/// @param completion Activate operation callback with changed and error parameters.
+- (void)activateWithCompletion:
+    (void (^_Nullable NS_SWIFT_SENDABLE)(BOOL changed, NSError *_Nullable error))completion;
+#else
 /// Applies Fetched Config data to the Active Config, causing updates to the behavior and appearance
 /// of the app to take effect (depending on how config data is used in the app).
 /// @param completion Activate operation callback with changed and error parameters.
 - (void)activateWithCompletion:(void (^_Nullable)(BOOL changed,
                                                   NSError *_Nullable error))completion;
+#endif
 
 #pragma mark - Get Config
 /// Enables access to configuration values by using object subscripting syntax.