How to convert Angular code to ES5

Question

  $rootScope.$on("$routeChangeStart",
    (event, current, previous, rejection) => {
      if (/#\//.test($window.location.hash)) {
        $location.path($window.location.hash.replace('#', ''));
      }
});

how to convert to ES5?

I want to remove => code because uglify can not work with it ...

Answer 1

  $rootScope.$on("$routeChangeStart",
   function(event, current, previous, rejection) {
    if (/#\//.test($window.location.hash)) {
      $location.path($window.location.hash.replace('#', ''));
    }
 });