metamask-extension/ui/app/helpers/higher-order-components/initialized/initialized.container.js

import { connect } from 'react-redux';
import Initialized from './initialized.component';

const mapStateToProps = (state) => {
  const {
    metamask: { completedOnboarding },
  } = state;

  return {
    completedOnboarding,
  };
};

export default connect(mapStateToProps)(Initialized);