How to check if a directive or controller is available in a module using Angularjs

Question

In angularjs, given a module, how do you check if a directive/controller exists given a module.

I have a module and I want to know if some particular directives have bee

Answer 1

I found some working code here

angular.service('ControllerChecker', ['$controller', function($controller) {
    return {
        exists: function(controllerName) {
            if(typeof window[controllerName] == 'function') {
                return true;
            }
            try {
                $controller(controllerName);
                return true;
            } catch (error) {
                return !(error instanceof TypeError);
            }
        }
    };
}]);

JSFiddle: http://jsfiddle.net/fracz/HB7LU/6780/