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src/index.js

@@ -6,9 +6,15 @@ import App from "./App";
 import * as serviceWorker from "./serviceWorker";
 import rootReducer from "./reducers";
 import thunk from "redux-thunk";
-import { createStore, applyMiddleware } from "redux";
+import { createStore, applyMiddleware, compose } from "redux";
 
-const store = createStore(rootReducer, applyMiddleware(thunk));
+const store = createStore(
+  rootReducer,
+  compose(
+    applyMiddleware(thunk),
+    window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()
+  )
+);
 
 ReactDOM.render(
   <Provider store={store}>