Revision 9f713e6f-cd34-4284-a6c1-d375f54b83e6

I'm currently struggling to include `*.css` and `*.js` files to my Bootstrap sub-theme.

I use *Drupal 8* and the *Bootstrap 3* base theme. I followed the instructions of the [official documentation](https://drupal-bootstrap.org/api/bootstrap) and went to create a custom *SASS* sub-theme for my site.

I could quickly use my newly created sub-theme in the admin panel. Great.

However it seems none of the assets registered in my `*.libraries.yml` are included in any page.

My `SUBTHEME.info.yml` file:

    core:       8.x
    type:       theme
    base theme: bootstrap

    name:         'My custom sub-theme'
    description:  'This is a sub-theme of Bootstrap, using the Sass starter kit.'
    package:      'Bootstrap'
    version:      'alpha'

    regions:
      navigation:             'Navigation'
      navigation_collapsible: 'Navigation (Collapsible)'
      header:                 'Top Bar'
      highlighted:            'Highlighted'
      help:                   'Help'
      content:                'Content'
      sidebar_first:          'Primary'
      sidebar_second:         'Secondary'
      footer:                 'Footer'
      page_top:               'Page top'
      page_bottom:            'Page bottom'

    libraries:
      - 'SUBTHEME/global-styling'
      - 'SUBTHEME/bootstrap-scripts'

My `SUBTHEME.libraries.yml` file (unchanged):

    global-styling:
      css:
        theme:
          css/style.css: {}

    bootstrap-scripts:
      js:
        bootstrap/assets/javascripts/bootstrap/affix.js: {}
        bootstrap/assets/javascripts/bootstrap/alert.js: {}
        bootstrap/assets/javascripts/bootstrap/button.js: {}
        bootstrap/assets/javascripts/bootstrap/carousel.js: {}
        bootstrap/assets/javascripts/bootstrap/collapse.js: {}
        bootstrap/assets/javascripts/bootstrap/dropdown.js: {}
        bootstrap/assets/javascripts/bootstrap/modal.js: {}
        bootstrap/assets/javascripts/bootstrap/tooltip.js: {}
        bootstrap/assets/javascripts/bootstrap/popover.js: {}
        bootstrap/assets/javascripts/bootstrap/scrollspy.js: {}
        bootstrap/assets/javascripts/bootstrap/tab.js: {}
        bootstrap/assets/javascripts/bootstrap/transition.js: {}

I strongly believe my folder hierarchy is right ; I use the base bootstrap `themes/bootstrap/templates/system/html.html.twig` which embarks the following header:

    <head>
      <head-placeholder token="{{ placeholder_token|raw }}">
      <title>{{ head_title|safe_join(' | ') }}</title>
      <css-placeholder token="{{ placeholder_token|raw }}">
      <js-placeholder token="{{ placeholder_token|raw }}">
    </head>

The CSS / JS aggregation option in the admin/config/development panel is disabled.

I compiled `sass/style.scss` and I do have a corresponding `css/style.css` file, however it never shows up on my pages. Even worse, it seems none of the libraries assets are included either.

No, I didn't forget to clear the cache. I also tried to solve my problem by reading other questions, like [this one](http://drupal.stackexchange.com/questions/222678/cannot-use-libraries-in-sub-theme) or [this one](http://drupal.stackexchange.com/questions/182897/theme-libraries-yml-having-no-effect?rq=1) ; however the questions are either not resolved or do not apply to my case.

I tried to add the following lines to my `SUBTHEME.info.yml`, unfortunately it doesn't work either:

    stylesheets:
      - 'css/style.css'

I tried to use the Drupal/Twig tag `attach_library` with no success.

Interestingly, assets added from third-party modules are successfully added in a way almost identical to what I'm trying.

I'm quite sure I'm missing something simple here. Any help deeply appreciated.