Count the number of watchers in AngularJS 1 include in bookmarklet

How long is a digest cycle ?

javascript:(function() {
  if (!angular) {
        alert('Not a angular application or window.angular not found');
        return;
    }
  
  var entryNode = document.querySelector('[ng-app]') || document.querySelector('.ng-scope');
  
  if (!entryNode) {
    alert('No entryPoint found');
    return;
  }
  
  angular.element(entryNode)
  .injector()
  .invoke(function($rootScope) { 
    var a = performance.now(); 
    $rootScope.$apply();
    alert('A digest cycle took ' + (performance.now()-a).toString() + ' ms '); 
  })
})();

howManyWatchers.js

javascript:(function () { 
    if (!angular) {
        alert('Not a angular application or window.angular not found');
        return;
    }
    
    var root = angular.element(document.getElementsByTagName('body'));

    var watchers = [];

    var f = function (element) {
        angular.forEach(['$scope', '$isolateScope'], function (scopeProperty) { 
            if (element.data() && element.data().hasOwnProperty(scopeProperty)) {
                angular.forEach(element.data()[scopeProperty].$$watchers, function (watcher) {
                    watchers.push(watcher);
                });
            }
        });

        angular.forEach(element.children(), function (childElement) {
            f(angular.element(childElement));
        });
    };

    f(root);

    var watchersWithoutDuplicates = [];
    angular.forEach(watchers, function(item) {
        if(watchersWithoutDuplicates.indexOf(item) < 0) {
             watchersWithoutDuplicates.push(item);
        }
    });

    alert('There is ' + watchersWithoutDuplicates.length + ' watcher(s) in the page');
})();