ckeditor_mentions-8.x-2.x-dev/ckeditor_mentions.libraries.yml

ckeditor.plugin.mention.drupal:
  version: VERSION
  css:
    component:
      css/ckeditor_mentions.css: {}
  js:
    js/build/drupalMention.js: {}
    js/build/mention.js: {}
  dependencies:
    - ckeditor5/ckeditor5
    - ckeditor_mentions/ckeditor_mentions