freeCodeCamp/client/src/redux/createStore.js

import { createStore as reduxCreateStore, applyMiddleware } from 'redux';
import createSagaMiddleware from 'redux-saga';

import rootReducer from './rootReducer';
import rootSaga from './rootSaga';

const sagaMiddleware = createSagaMiddleware();

export const createStore = () => {
  const store = reduxCreateStore(rootReducer, applyMiddleware(sagaMiddleware));
  sagaMiddleware.run(rootSaga);
  return store;
};