How to wrap your external callback for AngularJS

apply.js

mymodule.factory('myWrappedService', function($rootScope){
  var originalService; // Must be set from somewhere of course
  
  return {
    myAsyncFunction: function(a,b,callback){
      return originalService.asyncFunction(a,b,function(){
        var args = arguments, self=this;
        $rootScope.$apply(function(){
          callback.apply(self, arguments);
        })
      })
    }
  }
})