Test code that is run in browser devtools/console window proving out javascipt code for mimicing Protractor's waitForAngular function.

waitForAngularCore.js

    var callback = function () {console.log('*')};
    var el = document.querySelector('[ng-app]');
    var h = setInterval(function w4ng() {
        console.log('.');
        try {
            if (window.angular && !(window.angular.version &&
                  window.angular.version.major > 1)) {
              /* ng1 */
              angular.element(el).injector().get('$browser').
                  notifyWhenNoOutstandingRequests(callback);      
            } else if (window.getAngularTestability) {
              window.getAngularTestability(el).whenStable(callback);
            } else if (window.getAllAngularTestabilities) {
              var testabilities = window.getAllAngularTestabilities();
              var count = testabilities.length;
              var decrement = function() {
                count--;
                if (count === 0) {
                  callback();
                }
              };
              testabilities.forEach(function(testability) {
                testability.whenStable(decrement);
              });
            }
        } catch (err) {
          console.log(err.message);
          callback(err.message);
        }
      }, 10);