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diff --git a/Firebase/Core/Private/FIRReachabilityChecker+Internal.h b/Firebase/Core/Private/FIRReachabilityChecker+Internal.h
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+++ b/Firebase/Core/Private/FIRReachabilityChecker+Internal.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FIRReachabilityChecker.h"
+
+typedef SCNetworkReachabilityRef (*FIRReachabilityCreateWithNameFn)(CFAllocatorRef allocator,
+                                                                    const char *host);
+
+typedef Boolean (*FIRReachabilitySetCallbackFn)(SCNetworkReachabilityRef target,
+                                                SCNetworkReachabilityCallBack callback,
+                                                SCNetworkReachabilityContext *context);
+typedef Boolean (*FIRReachabilityScheduleWithRunLoopFn)(SCNetworkReachabilityRef target,
+                                                        CFRunLoopRef runLoop,
+                                                        CFStringRef runLoopMode);
+typedef Boolean (*FIRReachabilityUnscheduleFromRunLoopFn)(SCNetworkReachabilityRef target,
+                                                          CFRunLoopRef runLoop,
+                                                          CFStringRef runLoopMode);
+
+typedef void (*FIRReachabilityReleaseFn)(CFTypeRef cf);
+
+struct FIRReachabilityApi {
+  FIRReachabilityCreateWithNameFn createWithNameFn;
+  FIRReachabilitySetCallbackFn setCallbackFn;
+  FIRReachabilityScheduleWithRunLoopFn scheduleWithRunLoopFn;
+  FIRReachabilityUnscheduleFromRunLoopFn unscheduleFromRunLoopFn;
+  FIRReachabilityReleaseFn releaseFn;
+};
+
+@interface FIRReachabilityChecker (Internal)
+
+- (const struct FIRReachabilityApi *)reachabilityApi;
+- (void)setReachabilityApi:(const struct FIRReachabilityApi *)reachabilityApi;
+
+@end