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How to enqueue CSS to administrator side via module

I have a custom Drupal module and I would like to enqueue its CSS to the administrator side. I’ve tried to add it to the .info.yml file.

css:   theme:     admin-styles.css: {}

I also implemented hook_page_attachments() in the module as described in Custom module for adding CSS file in admin section.

function admin_css_page_attachments(array &$attachments) {   $is_admin = Drupal::service('router.admin_context')->isAdminRoute();   if ($is_admin) {     $attachments['#attached']['library'][] = 'admin-styles.css';   } }

I still don’t see the CSS file in the source code of the administrator panel.

This article was republished from its original source.
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How to enqueue CSS to administrator side via module

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