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diff --git a/Firebase/Database/Utilities/FTypedefs.h b/Firebase/Database/Utilities/FTypedefs.h
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+++ b/Firebase/Database/Utilities/FTypedefs.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 <Foundation/Foundation.h>
+
+#ifndef Firebase_FTypedefs_h
+#define Firebase_FTypedefs_h
+
+/**
+ * Stub...
+ */
+@class FIRDataSnapshot;
+@class FIRDatabaseReference;
+@class FAuthData;
+@protocol FNode;
+
+// fbt = Firebase Block Typedef
+
+typedef void (^fbt_void_void)(void);
+typedef void (^fbt_void_datasnapshot_nsstring) (FIRDataSnapshot *snapshot, NSString *prevName);
+typedef void (^fbt_void_datasnapshot) (FIRDataSnapshot *snapshot);
+typedef void (^fbt_void_user)(FAuthData *user);
+typedef void (^fbt_void_nsstring_id)(NSString* status, id data);
+typedef void (^fbt_void_nserror_id)(NSError* error, id data);
+typedef void (^fbt_void_nserror)(NSError *error);
+typedef void (^fbt_void_nserror_ref)(NSError* error, FIRDatabaseReference * ref);
+typedef void (^fbt_void_nserror_user)(NSError* error, FAuthData * user);
+typedef void (^fbt_void_nserror_json)(NSError* error, NSDictionary* json);
+typedef void (^fbt_void_nsdictionary)(NSDictionary *data);
+typedef id (^fbt_id_node_nsstring)(id<FNode> node, NSString* childName);
+
+#endif