old_contents: import { PropTypes } from 'react';
  
  export default {
    message: PropTypes.oneOfType([
      PropTypes.string,
      PropTypes.element
    ]).isRequired,
    action: PropTypes.oneOfType([
      PropTypes.bool,
      PropTypes.string,
      PropTypes.node
    ]),
    onClick: PropTypes.func,
    style: PropTypes.bool,
    actionStyle: PropTypes.object,
    barStyle: PropTypes.object,
    activeBarStyle: PropTypes.object,
    dismissAfter: PropTypes.oneOfType([
      PropTypes.bool,
      PropTypes.number
    ]),
    onDismiss: PropTypes.func,
    className: PropTypes.string,
    activeClassName: PropTypes.string.isRequired,
    isActive: PropTypes.bool,
    title: PropTypes.string
  };
  
new_contents: import { PropTypes } from 'react';
  
  export default {
    message: PropTypes.oneOfType([
      PropTypes.string,
      PropTypes.element
    ]).isRequired,
    action: PropTypes.oneOfType([
      PropTypes.bool,
      PropTypes.string,
      PropTypes.node
    ]),
    onClick: PropTypes.func,
    style: PropTypes.bool,
    actionStyle: PropTypes.object,
    barStyle: PropTypes.object,
    activeBarStyle: PropTypes.object,
    dismissAfter: PropTypes.oneOfType([
      PropTypes.bool,
      PropTypes.number
    ]),
    onDismiss: PropTypes.func,
    className: PropTypes.string,
    activeClassName: PropTypes.string,
    isActive: PropTypes.bool,
    title: PropTypes.string
  };
  
subject: Update activeClassName prop