redux-devtools/packages/redux-devtools-app/src/index.tsx

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import { Store } from 'redux';
import { Persistor } from 'redux-persist';
import { PersistGate } from 'redux-persist/integration/react';
import configureStore from './store/configureStore';
import { CONNECT_REQUEST } from './constants/socketActionTypes';
import App from './containers/App';
import { StoreState } from './reducers';
import { StoreAction, applyMediaFeaturesPreferences } from './actions';

class Root extends Component {
  store?: Store<StoreState, StoreAction>;
  persistor?: Persistor;

  UNSAFE_componentWillMount() {
    const { store, persistor } = configureStore(
      (store: Store<StoreState, StoreAction>) => {
        if (store.getState().connection.type !== 'disabled') {
          store.dispatch({
            type: CONNECT_REQUEST,
          });
        }
      }
    );
    this.store = store;
    this.persistor = persistor;
  }

  /**
   * @hidden
   * @private
   */
  private _checkMediaFeaturesPreferences = () => {
    if (this.store) {
      this.store.dispatch(applyMediaFeaturesPreferences());
    }
  };

  render() {
    if (!this.store) return null;

    return (
      <Provider store={this.store}>
        <PersistGate
          loading={null}
          persistor={this.persistor!}
          onBeforeLift={this._checkMediaFeaturesPreferences}
        >
          <App />
        </PersistGate>
      </Provider>
    );
  }
}

export default Root;