Fix: don't push undefined into middleware

Author: ethanlee16

app/javascript/reducers/initialState.js

@@ -1,4 +1,3 @@
-import { combineReducers } from "redux";
 import { persistCombineReducers } from "redux-persist";
 import storage from "redux-persist/es/storage";
 import { LOAD_INITIAL_STATE } from "../constants";

app/javascript/store/index.js

@@ -1,36 +1,31 @@
-import React from 'react';
+import React from "react";
 
-import { createStore, compose, applyMiddleware } from 'redux';
-import { createDevTools } from 'redux-devtools';
-import { createLogger } from 'redux-logger';
+import { createStore, compose, applyMiddleware } from "redux";
+import { createDevTools } from "redux-devtools";
+import { createLogger } from "redux-logger";
 
-import LogMonitor from 'redux-devtools-log-monitor';
-import DockMonitor from 'redux-devtools-dock-monitor';
+import LogMonitor from "redux-devtools-log-monitor";
+import DockMonitor from "redux-devtools-dock-monitor";
 
-import { persistStore } from 'redux-persist';
-import storage from 'redux-persist/es/storage';
+import { persistStore } from "redux-persist";
 
 const logger = createLogger();
 
 const DevToolsContainer = createDevTools(
-  <DockMonitor
-    toggleVisibilityKey='ctrl-h'
-    changePositionKey='ctrl-q'
-  >
+  <DockMonitor toggleVisibilityKey="ctrl-h" changePositionKey="ctrl-q">
     <LogMonitor />
   </DockMonitor>
 );
 
 let composition = [];
 
-if (process.env.NODE_ENV === 'production') {
+if (process.env.NODE_ENV === "production") {
   // Any production-specific reducers
 } else {
   composition.push(applyMiddleware(logger));
-  composition.push(
-    window.__REDUX_DEVTOOLS_EXTENSION__
-    && window.__REDUX_DEVTOOLS_EXTENSION__()
-  );
+  if (window.__REDUX_DEVTOOLS_EXTENSION__) {
+    composition.push(window.__REDUX_DEVTOOLS_EXTENSION__());
+  }
 }
 
 function initializeStore(rootReducer) {
@@ -39,4 +34,4 @@ function initializeStore(rootReducer) {
   return { store, persistor };
 }
 
-export { DevToolsContainer, initializeStore }; 
+export { DevToolsContainer, initializeStore };