angularjs-watchers-count.js

function count() {
   var root = angular.element(document.querySelector('[ng-app]')).injector().get('$rootScope');
   
   var count = root.$$watchers ? root.$$watchers.length : 0; // include the current scope
   var countScopes = 1;
   
   var pendingChildHeads = [root.$$childHead];
   var currentScope;

   while (pendingChildHeads.length) 
    {
    currentScope = pendingChildHeads.shift();

    while (currentScope) {
      count += currentScope.$$watchers ? currentScope.$$watchers.length : 0;
      countScopes ++;
      pendingChildHeads.push(currentScope.$$childHead);
      currentScope = currentScope.$$nextSibling;
      }
    }

   console.log("#watchers = " + count);
   console.log("#scopes = " + countScopes);
}