Extending link-to helper in Ember 1.10

How should I create helpers for Ember 1.10 version?

Ember.Handlebars.helper('my-link-to', function() {
  # Some cool logic here
  return Ember.Handlebars.helpers['link-to'].apply(this, arguments);
});
...
<script type="text/x-handlebars" data-template-name="index">
  {{#my-link-to index}}
    Hello
  {{/my-link-to}}
</script>

Im trying to create a custom link-to helper by extending the existant one, but I dont get it. Here is the bin:

http://ift.tt/1DmxHkM