astuto/app/javascript/stores/index.ts

import { createStore, applyMiddleware } from 'redux';
import thunkMiddleware from 'redux-thunk';

import rootReducer from '../reducers/rootReducer';

const store = createStore(
  rootReducer,
  applyMiddleware(
    thunkMiddleware,
  ),
);

store.subscribe(() => console.log(store.getState()));

export default store;