index reducer in background

src/background/reducers/index.js

@@ -0,0 +1,12 @@
+import settingReducer from 'settings/reducers/setting';
+
+// Make setting reducer instead of re-use
+const defaultState = {
+  setting: settingReducer(undefined, {}),
+};
+
+export default function reducer(state = defaultState, action = {}) {
+  return Object.assign({}, state, {
+    setting: settingReducer(state.setting, action),
+  });
+}