import PropTypes from 'prop-types';

import semver from 'semver';

export function semverString(props, propName, componentName) {

  let version = props[propName];

  let error = PropTypes.string(...arguments);

  if (!error && version != null && !semver.valid(version))

    error = new Error(

      `\`${propName}\` should be a valid "semantic version" matching ` +

        'an existing React version'

    );

  return error || null;

}