diff --git a/synapse/replication/tcp/streams/__init__.py b/synapse/replication/tcp/streams/__init__.py
new file mode 100644
index 0000000000..5c715e3bfa
--- /dev/null
+++ b/synapse/replication/tcp/streams/__init__.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 Vector Creations Ltd
+# Copyright 2019 New Vector Ltd
+#
+# 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.
+
+"""Defines all the valid streams that clients can subscribe to, and the format
+of the rows returned by each stream.
+
+Each stream is defined by the following information:
+
+ stream name: The name of the stream
+ row type: The type that is used to serialise/deserialse the row
+ current_token: The function that returns the current token for the stream
+ update_function: The function that returns a list of updates between two tokens
+"""
+
+from . import _base, events, federation
+
+STREAMS_MAP = {
+ stream.NAME: stream
+ for stream in (
+ events.EventsStream,
+ _base.BackfillStream,
+ _base.PresenceStream,
+ _base.TypingStream,
+ _base.ReceiptsStream,
+ _base.PushRulesStream,
+ _base.PushersStream,
+ _base.CachesStream,
+ _base.PublicRoomsStream,
+ _base.DeviceListsStream,
+ _base.ToDeviceStream,
+ federation.FederationStream,
+ _base.TagAccountDataStream,
+ _base.AccountDataStream,
+ _base.CurrentStateDeltaStream,
+ _base.GroupServerStream,
+ )
+}
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