Multiple instances in dropdown

import { applyMiddleware, compose, createStore } from "redux";
import thunk from "redux-thunk";
import rootReducer from "./reducers";

const composeEnhancers =
  typeof window === "object" && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
    ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__({
        // Specify extension’s options like name, actionsBlacklist, actionsCreators, serialize...
      })
    : compose;

const enhancer = composeEnhancers(applyMiddleware(thunk));
const store = createStore(rootReducer, enhancer);

export default store;