I want to use window.location in MarkupTemplateEngine, but am getting an error cannot get property location on null object.

My code is something like this:

...
div(){
   def link = "${window.location.href}"
   a(href:"localhost:8080?link=${link}", 'My link')
}
...

However link isn't rendered and i'm getting the error in console trying to access property of null.

With that said, I'm able to get full-fledged window object in browser console.