frontend-bootcamp/playground/src/index.tsx

import React from 'react';
import ReactDOM from 'react-dom';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import { reducer } from './reducers';
import TodoAppContainer from './components/TodoAppContainer';
import { initializeIcons } from '@uifabric/icons';

declare var window: any;

const store = createStore(reducer, window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__());
initializeIcons();
ReactDOM.render(
  <Provider store={store}>
    <TodoAppContainer />
  </Provider>,
  document.getElementById('app')
);