diff --git a/lib/ops/base-ops.js b/lib/ops/base-ops.js
new file mode 100644
--- /dev/null
+++ b/lib/ops/base-ops.js
@@ -0,0 +1,18 @@
+// @flow
+
+export type BaseStoreOpsHandlers<
+  Store,
+  Operation,
+  ClientDBOperation,
+  DataType,
+  ClientDBDataType,
+> = {
+  processStoreOperations: (
+    store: Store,
+    ops: $ReadOnlyArray<Operation>,
+  ) => Store,
+  convertOpsToClientDBOps: (
+    ops: $ReadOnlyArray<Operation>,
+  ) => $ReadOnlyArray<ClientDBOperation>,
+  translateClientDBData: (data: $ReadOnlyArray<ClientDBDataType>) => DataType,
+};