How to interrupt jade and concat and guess javascript files?

Here is a typical type of jade

extend layout
  block head
    script(src="/js/polyfills/html5shiv.js")
  block body
    header
      nav...
    main
      section
      form...
    footer
      nav...
    script(src="/js/polyfills/arrayGenerics.js")
    script(src="/js/polyfills/placeholder.js")
    script(src="/js/formSubmitter.js")

      

        
        
        
      

    

This usually turns into HTML, but wouldn't it be nice if the javascript was concatenated and extinct (or at least only concatenated) before it hits the browser?

Stylus does this pretty well for CSS. Is there a way to interrupt the jade before it renders HTML? Sense, can I run custom js in my app.js file before the html hits the browser?