backup. before shop update

lib/store/reducer/device_id_reducer.dart

@@ -0,0 +1,11 @@
+import 'package:redux/redux.dart';
+
+import '../actions.dart';
+
+final deviceIdReducer = combineReducers<String>([
+  TypedReducer<String, UpdateDeviceId>(_updateDeviceId)
+]);
+
+String _updateDeviceId(String deviceId, action) {
+  return action.deviceId;
+}