nodejs and jade, object is not defined

I'm using node js, jade, and drywall (account management system) and I'm including a stripe script in my views/signup/index.jade file, like this:

extends ../../layouts/default

block head
  title Sign Up

block neck
  link(rel='stylesheet', href='/views/signup/index.min.css?#{cacheBreaker}')

block feet
  script(src='/views/signup/index.min.js?#{cacheBreaker}')
  script(src='src="https://js.stripe.com/v2/"')
  script
    Stripe.setPublishableKey('pk_test_4ZVxtJ6e1uJJxWi2L6QWL8Hq');

And in my public/views/index.js file I'm calling this function

Stripe.card.createToken($form, stripeResponseHandler);

However, I get the error Stripe is not defined. (meaning that the Stripe script I imported isn't being acccesed in the file that I'm in). So I thought to move the script tag to my layouts/default.jade file and put it in the head so it would appear in the head of every document, but still no luck. Any ideas on what I'm doing wrong?