next.js/examples/with-apollo-and-redux-saga/lib/withReduxSaga.js

import { composeWithDevTools } from 'redux-devtools-extension'

import { createStore, applyMiddleware } from 'redux'
import createSagaMiddleware from 'redux-saga'
import nextReduxWrapper from 'next-redux-wrapper'
import nextReduxSaga from 'next-redux-saga'

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

const sagaMiddleware = createSagaMiddleware()

export function configureStore(initialState = {}) {
  const store = createStore(
    rootReducer,
    initialState,
    composeWithDevTools(applyMiddleware(sagaMiddleware))
  )
  store.sagaTask = sagaMiddleware.run(rootSaga)
  return store
}

export default function (BaseComponent) {
  return nextReduxWrapper(configureStore)(nextReduxSaga(BaseComponent))
}