arch-8.x-1.x-dev/modules/order/arch_order.libraries.yml

drupal.order:
  css:
    layout:
      assets/css/module.css: {}
  js:
    assets/js/order.js: {}
  dependencies:
  - core/drupal.entity-form
  - core/drupalSettings

drupal.order.admin:
  css:
    theme:
      assets/css/admin.css: {}

form:
  css:
    layout:
      assets/css/module.css: {}