/**
 * Copyright (c) 2017-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

export default (function() {
  if (typeof window === 'undefined') {
    return null;
  }

  return {
    onRouteUpdate({location}) {
      // Set page so that subsequent hits on this page are attributed
      // to this page. This is recommended for Single-page Applications.
      window.ga('set', 'page', location.pathname);
      // Always refer to the variable on window in-case it gets overridden elsewhere.
      window.ga('send', 'pageview');
    },
  };
})();