angular.js Dom based active watchers counter

getWatchers.js

function getWatchers(root) {
  root = angular.element(root || document.documentElement);
  var watcherCount = 0;
  var scopeArr = [];
  function getElemWatchers(element) {
    var isolateWatchers = getWatchersFromScope(element.data().$isolateScope);
    var scopeWatchers = getWatchersFromScope(element.data().$scope);
    var watchers = scopeWatchers.concat(isolateWatchers);
    angular.forEach(element.children(), function (childElement) {
      watchers = watchers.concat(getElemWatchers(angular.element(childElement)));
    });
    return watchers;
  }
 
  function getWatchersFromScope(scope) {
   
    if (scope && scopeArr.indexOf(scope.$id) == -1) {
      scopeArr.push(scope.$id)
      return scope.$$watchers || [];
    } else {
      return [];
    }
  }
 
  return getElemWatchers(root);
}
//usage:
//getWatchers(document.body).length