content: import {connect} from 'react-redux';
  import React from 'react';
  import PropTypes from 'prop-types';
  
  function Loading(props) {
      if (props.isLoading) {
          return <div className='_dash-loading-callback' />;
      }
      return null;
  }
  
  Loading.propTypes = {
      isLoading: PropTypes.bool.isRequired
  };
  
  export default connect(state => ({
      isLoading: state.isLoading
  }))(Loading);
  