Angular ControllerAs syntax with custom directive

Hello I have a problem in uploading an image .I use typescript so I tried to adapt a fiddle. I found on the internet but the problem is that I don't use the scope so the field 'myFile' is not being modified from the directive.I used the bindToController and scope:{myFile'='} but it doesn't work.

Thanks for your help

If you want use controller syntax for directive , use like this

function myExample() {
    var directive = {
        restrict: 'EA',
        templateUrl: '...',
        scope: {
            myFile: '='
        },
        link: linkFunc,
        controller: ExampleController,

        controllerAs: 'vm',
        bindToController: true 
    };
return directive

  function linkFunc(scope, el, attr, ctrl) {
   scope.vm.myFile = ...
}
}
function ExampleController(){
var vm = this
}