Configuring the store

Since we know what a store is in Redux, let's get started with creating a store file. We can keep our store in a separate file. Let's call it configureStore.js:

import { createStore, applyMiddleware, compose } from "redux";

import createReducer from "./reducers";

export default function configureStore(initialState = {}, history) {
 const store = createStore(
   createReducer(),
 );

 // Extensions
 store.injectedReducers = {}; // Reducer registry

 return store;
}