In Drupal 8 the weight for javascript files in libraries is not supported, or at least only negative values are allowed, which means I am only able to position them at the top of the list (i.e. load it first) but not at the end of the list.

I have a library for the Zurb Foundation and its initialization has to be loaded last. It is a requirement for my theme and I don't want to override a template to fix this problem.

How is one supposed to do this?

  • What is the code you are currently using to add the library?
    – rooby
    Apr 20, 2015 at 1:19
  • rooby: it's just a library dependency in theme's base library file.
    – user21641
    Apr 20, 2015 at 6:11

1 Answer 1


I was surprised hear that "only negative values are allowed" as JS weights, so I had to hunt that down. And it's true... https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Asset%21LibraryDiscoveryParser.php/function/LibraryDiscoveryParser%3A%3AbuildByExtension/8.2.x There is an exception error message that says, "The $extension/$id library defines a positive weight for '$source'. Only negative weights are allowed (but should be avoided). Instead of a positive weight, specify accurate dependencies for this library."

This of course reminded me that, yes indeed, dependencies were added/improved in Drupal 8 so that we didn't have to worry about this. Oddly enough, there are several core JS files that define weight, so I guess we are only part way there.

So, this is just a long-winded way of saying, what scripts does the Zurb Foudation depend on? And can you list those dependencies in your libraries file under the Zurb script? See https://www.drupal.org/docs/8/creating-custom-modules/adding-stylesheets-css-and-javascript-js-to-a-drupal-8-module for more info.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.