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diff --git a/Firebase/Storage/Private/FIRStorageTaskSnapshot_Private.h b/Firebase/Storage/Private/FIRStorageTaskSnapshot_Private.h
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+++ b/Firebase/Storage/Private/FIRStorageTaskSnapshot_Private.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 "FIRStorageConstants_Private.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class FIRStorageMetadata;
+@class FIRStorageReference;
+@class FIRStorageTask;
+
+@interface FIRStorageTaskSnapshot ()
+
+@property(readwrite, copy, nonatomic) FIRStorageTask *task;
+@property(readwrite, copy, nonatomic) FIRStorageMetadata *metadata;
+@property(readwrite, copy, nonatomic) FIRStorageReference *reference;
+@property(readwrite, strong, nonatomic) NSProgress *progress;
+@property(readwrite, copy, nonatomic) NSError *error;
+
+/**
+ * Creates a new task snapshot from the given properties.
+ * @param task The task being represented in this snapshot.
+ * @param state The current state of the parent task.
+ * @param metadata The FIRStorageMetadata of a task. Before upload/update, contains the metadata
+ * to be updated; after, contains the returned metadata. May be nil if no metadata is provided
+ * or returned.
+ * @param reference The FIRStorageReference that spawned the task this snapshot is based on.
+ * @param progress An NSProgress object containing progress of the task this snapshot is based on,
+ * or nil if the task doesn't report progress.
+ * @param error An NSError object containing an error that occurred during the task,
+ * if one occurred.
+ * @return Returns the constructed snapshot.
+ */
+- (instancetype)initWithTask:(__kindof FIRStorageTask *)task
+                       state:(FIRStorageTaskState)state
+                    metadata:(nullable FIRStorageMetadata *)metadata
+                   reference:(FIRStorageReference *)reference
+                    progress:(nullable NSProgress *)progress
+                       error:(nullable NSError *)error;
+
+@end
+
+NS_ASSUME_NONNULL_END