--- /dev/null
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2016 Realm Inc.
+//
+// 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 "RLMSyncSession.h"
+
+#import "RLMSyncUtil_Private.h"
+#import <memory>
+
+namespace realm {
+class SyncSession;
+}
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RLMSyncSession () {
+@public // So it's visible to tests
+ std::weak_ptr<realm::SyncSession> _session;
+} RLM_SYNC_UNINITIALIZABLE
+
+- (instancetype)initWithSyncSession:(std::shared_ptr<realm::SyncSession>)session;
+
+/// Wait for pending uploads to complete or the session to expire, and dispatch the callback onto the specified queue.
+- (BOOL)waitForUploadCompletionOnQueue:(nullable dispatch_queue_t)queue callback:(void(^)(NSError * _Nullable))callback;
+
+/// Wait for pending downloads to complete or the session to expire, and dispatch the callback onto the specified queue.
+- (BOOL)waitForDownloadCompletionOnQueue:(nullable dispatch_queue_t)queue callback:(void(^)(NSError * _Nullable))callback;
+
+@end
+
+@interface RLMSyncErrorActionToken ()
+
+- (instancetype)initWithOriginalPath:(std::string)originalPath;
+
+@end
+
+NS_ASSUME_NONNULL_END