store.js

import { createStore, applyMiddleware, compose } from "redux";
import history from "./history";
import { routerMiddleware } from "connected-react-router";
import thunk from "redux-thunk";
import rootReducer from "./reducers";
const initialState = {};
const enhancers = [];
const middleware = [thunk, routerMiddleware(history)];
if (process.env.NODE_ENV === "development") {
  const devToolsExtension = window.__REDUX_DEVTOOLS_EXTENSION__;
  if (typeof devToolsExtension === "function") {
    enhancers.push(devToolsExtension());
  }
}
const composedEnhancers = compose(
 applyMiddleware(...middleware),
 ...enhancers
);
export default createStore(rootReducer, initialState, composedEnhancers);