ckeditor5-1.0.x-dev/modules/ckeditor5_dev/ckeditor5_dev.libraries.yml

ckeditor5_dev:
  js:
    # The CKEditor 5 inspector does not need to be woven into Drupal's
    # CKEditor 5 build. It is effectively standalone, and the inspector
    # constructor receives an initialized CKEditor instance.
    #
    # @see https://github.com/ckeditor/ckeditor5-inspector
    https://unpkg.com/@ckeditor/ckeditor5-inspector/build/inspector.js: { external: true, minified: true }
    js/ckeditor5_dev.js: {}
  dependencies:
    - core/drupal
    - core/once