mastodon/app/javascript/mastodon/store/configureStore.js

import { configureStore } from '@reduxjs/toolkit';
import thunk from 'redux-thunk';
import appReducer from '../reducers';
import loadingBarMiddleware from '../middleware/loading_bar';
import errorsMiddleware from '../middleware/errors';
import soundsMiddleware from '../middleware/sounds';

export const store = configureStore({
  reducer: appReducer,
  middleware: [
    thunk,
    loadingBarMiddleware({ promiseTypeSuffixes: ['REQUEST', 'SUCCESS', 'FAIL'] }),
    errorsMiddleware(),
    soundsMiddleware(),
  ],
});