PropTypes.js

import PropTypes from 'prop-types';

export const timeoutsShape =
  process.env.NODE_ENV !== 'production'
    ? PropTypes.oneOfType([
        PropTypes.number,
        PropTypes.shape({
          enter: PropTypes.number,
          exit: PropTypes.number,
          appear: PropTypes.number,
        }).isRequired
      ])
    : null;

export const classNamesShape =
  process.env.NODE_ENV !== 'production'
    ? PropTypes.oneOfType([
        PropTypes.string,
        PropTypes.shape({
          enter: PropTypes.string,
          exit: PropTypes.string,
          active: PropTypes.string
        }),
        PropTypes.shape({
          enter: PropTypes.string,
          enterDone: PropTypes.string,
          enterActive: PropTypes.string,
          exit: PropTypes.string,
          exitDone: PropTypes.string,
          exitActive: PropTypes.string
        })
      ])
    : null;