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diff --git a/Firebase/Database/Api/FIRDatabaseConfig.h b/Firebase/Database/Api/FIRDatabaseConfig.h
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+++ b/Firebase/Database/Api/FIRDatabaseConfig.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>
+
+@protocol FAuthTokenProvider;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * TODO: Merge FIRDatabaseConfig into FIRDatabase.
+ */
+@interface FIRDatabaseConfig : NSObject
+
+- (id)initWithSessionIdentifier:(NSString *)identifier authTokenProvider:(id<FAuthTokenProvider>)authTokenProvider;
+
+/**
+ * By default the Firebase Database client will keep data in memory while your application is running, but not
+ * when it is restarted. By setting this value to YES, the data will be persisted to on-device (disk)
+ * storage and will thus be available again when the app is restarted (even when there is no network
+ * connectivity at that time). Note that this property must be set before creating your first FIRDatabaseReference
+ * and only needs to be called once per application.
+ *
+ * If your app uses Firebase Authentication, the client will automatically persist the user's authentication
+ * token across restarts, even without persistence enabled. But if the auth token expired while offline and
+ * you've enabled persistence, the client will pause write operations until you successfully re-authenticate
+ * (or explicitly unauthenticate) to prevent your writes from being sent unauthenticated and failing due to
+ * security rules.
+ */
+@property (nonatomic) BOOL persistenceEnabled;
+
+/**
+ * By default the Firebase Database client will use up to 10MB of disk space to cache data. If the cache grows beyond this size,
+ * the client will start removing data that hasn't been recently used. If you find that your application caches too
+ * little or too much data, call this method to change the cache size. This property must be set before creating
+ * your first FIRDatabaseReference and only needs to be called once per application.
+ *
+ * Note that the specified cache size is only an approximation and the size on disk may temporarily exceed it
+ * at times.
+ */
+@property (nonatomic) NSUInteger persistenceCacheSizeBytes;
+
+/**
+ * Sets the dispatch queue on which all events are raised. The default queue is the main queue.
+ */
+@property (nonatomic, strong) dispatch_queue_t callbackQueue;
+
+@end
+
+NS_ASSUME_NONNULL_END