4 files changed, 7 insertions, 11 deletions
diff --git a/src/background/components/operation.js b/src/background/components/operation.js
index 58edb8c..465baf0 100644
--- a/src/background/components/operation.js
+++ b/src/background/components/operation.js
@@ -28,7 +28,7 @@ export default class BackgroundComponent {
     }
   }
 
-  // eslint-disable-next-line complexity
+  // eslint-disable-next-line complexity, max-lines-per-function
   exec(operation, tab) {
     let tabState = this.store.getState().tab;
 
diff --git a/src/background/reducers/find.js b/src/background/reducers/find.js
index 4ded801..bbc6b36 100644
--- a/src/background/reducers/find.js
+++ b/src/background/reducers/find.js
@@ -7,9 +7,8 @@ const defaultState = {
 export default function reducer(state = defaultState, action = {}) {
   switch (action.type) {
   case actions.FIND_SET_KEYWORD:
-    return Object.assign({}, state, {
-      keyword: action.keyword,
-    });
+    return { ...state,
+      keyword: action.keyword, };
   default:
     return state;
   }
diff --git a/src/background/reducers/index.js b/src/background/reducers/index.js
index 5729f0a..78f855c 100644
--- a/src/background/reducers/index.js
+++ b/src/background/reducers/index.js
@@ -10,9 +10,8 @@ const defaultState = {
 };
 
 export default function reducer(state = defaultState, action = {}) {
-  return Object.assign({}, state, {
+  return { ...state,
     setting: settingReducer(state.setting, action),
     find: findReducer(state.find, action),
-    tab: tabReducer(state.tab, action),
-  });
+    tab: tabReducer(state.tab, action), };
 }
diff --git a/src/background/reducers/setting.js b/src/background/reducers/setting.js
index 045a654..8dbc1b4 100644
--- a/src/background/reducers/setting.js
+++ b/src/background/reducers/setting.js
@@ -12,10 +12,8 @@ export default function reducer(state = defaultState, action = {}) {
     };
   case actions.SETTING_SET_PROPERTY:
     return {
-      value: Object.assign({}, state.value, {
-        properties: Object.assign({}, state.value.properties,
-          { [action.name]: action.value })
-      })
+      value: { ...state.value,
+        properties: { ...state.value.properties, [action.name]: action.value }}
     };
   default:
     return state;