TypeScript - best syntax for adding new properties to a typed object without declaring a new interface? -

i've been using typescript angular half year now. when need add $scope, follow imho best practice of defining interface this:

interface imyscope extends ng.iscope {      myaddedprop:string; }  ...  link:($scope:imyscope ){     $scope.myaddedprop = "foo"; } 

however, @ times still convenient add properties $scope on fly (mainly when i'm prototyping). cases this:

link:($scope:iscope ){      (<any>$scope).myaddedprop = "foo";      //or     $scope["myaddedprop"] = "foo";      //if have add many props, use this:     var $scopea: = $scope;     $scopea.myaddedprop1 = "foo";     $scopea.myaddedprop2 = "bar";     $scopea.myaddedprop3 = "baz"; } 

i've had problem in nodejs , other libraries - when need add few properties , don't want bother interface.

so search gives options, isn't there better way it?

 $scope*.newprop = "foo"; 

?

if put class on scope:

interface imyscope extends ng.iscope {      vm:someclass; }  link:($scope:imyscope){      scope.vm = new someclass(); } 

then can add new properties someclass without need maintain interface manually.

even better use controller option on directive setup class you.