mastodon/app/assets/javascripts/components/store/configureStore.jsx

import { createStore, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk';
import appReducer from '../reducers';
import loadingBarMiddleware from '../middleware/loading_bar';
import errorsMiddleware from '../middleware/errors';
import Immutable from 'immutable';

export default function configureStore() {
  return createStore(appReducer, compose(applyMiddleware(thunk, loadingBarMiddleware({
    promiseTypeSuffixes: ['REQUEST', 'SUCCESS', 'FAIL'],
  }), errorsMiddleware()), window.devToolsExtension ? window.devToolsExtension() : f => f));
};