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According to https://sqndr.github.io/d8-theming-guide/libraries/libraries-and-twig.html, you can include a library within twig template to only load it on specific pages using {{ attach_library('theme/library') }}. This appears to be for libraries included in mytheme.libraries.yml.

Is there a way to use this to include a library from sites/all/libraries? It seems silly to add a library to my theme folder when it is already available globally.

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  • You can add globally available libraries from modules and drupal core in the same way. - About the second part of your question, can you give more details what libraries you have in /sites/all/libraries, this looks like the folder name the Libraries API module used in D7, which is not ported to D8 yet. – 4k4 May 5 '17 at 21:15
  • When the Libraries API module is ready for D8, loading libraries in twig will be supported, see drupal.org/node/1704734#comment-11908472 – 4k4 May 5 '17 at 21:19
  • @4k4, I didn't realize libraries wasn't ready for D8 yet, actually. Modules are still instructing to add reqs to that folder -- probably just for future-proofing. Specifically, for this I am using drupal.org/project/magnific_popup, so I'm just trying to leverage that js without doubling it up into my theme folder. – Mrweiner May 5 '17 at 21:42
  • Yes, some D8 modules instruct you to download them to /libraries by hand. But these libraries can be used only by the module that instructed you to do so, because no one else knows the location of the files. – 4k4 May 5 '17 at 21:57
  • So in this case, since I know the location of the files, could I load them from my theme? Or do I need to wait for Libraries API? – Mrweiner May 5 '17 at 21:58
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There was likely a module that required the files in question to be added to the sites/all/libraries folder. You could review that module on how it adds those files as libraries. Check that module for a .libraries.yml file or check to see if the module implements hook_library_info_build(). Once you know the how to reference the library, you should be able to use the same reference in your twig template.

As an example, the Easychart module (https://www.drupal.org/project/easychart) has both a .libraries.yml and implements the hook in it's .module file. To reference one of those libraries you would use "easychart/easychart.render" or "easychart/lib.highcharts"

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