import { createStore, applyMiddleware, compose } from 'redux'; import { composeWithDevTools } from 'redux-devtools-extension'; import thunk from 'redux-thunk'; import invariant from 'redux-immutable-state-invariant'; import reducer from '../reducers'; import * as actionCreators from '../actions/counter'; export default function configureStore(preloadedState) { const composeEnhancers = composeWithDevTools({ actionCreators, trace: true, traceLimit: 25, }); const store = createStore( reducer, preloadedState, composeEnhancers(applyMiddleware(invariant(), thunk)) ); if (module.hot) { // Enable Webpack hot module replacement for reducers module.hot.accept('../reducers', () => { store.replaceReducer(require('../reducers').default); }); } return store; }