AngularJs: Measure digest timings for a specific scope

angular-digest.js

  // Modify angular.js $rootScope.Scope#$digest. Replace the depth-first traversal chunk with what is below.
  // Then within your app assign window.trackScopeId = $scope.$id;

            // Insanity Warning: scope depth-first traversal
            // yes, this code is a bit crazy, but it works and we have tests to prove it!
            // this piece should be kept in sync with the traversal in $broadcast
            if (!(next = (current.$$childHead ||
                (current !== target && current.$$nextSibling)))) {
              while (current !== target && !(next = current.$$nextSibling)) {

                if(current.$id === window.trackScopeId && current.$$digestStart) {
                  var deltaTime = (performance.now() - next.$$digestStart);

                  if(deltaTime > 1000) {
                    // debugger;
                  }

                  console.log('watch $digest', deltaTime, 'ms ttl', TTL - ttl, 'digest trigger by', this.$id);

                  next.$$digestStart = null;
                }

                current = current.$parent;
              }
            }

            if(next && next.$id === window.trackScopeId) {
              if(!next.$$digestStart) {
                next.$$digestStart = performance.now();
              } else {
                var deltaTime = (performance.now() - next.$$digestStart);

                if(deltaTime > 1000) {
                  // debugger;
                }

                console.log('watch $digest', deltaTime, 'ms ttl', TTL - ttl, 'digest trigger by', this.$id);

                next.$$digestStart = null;
              }
            }