ui_icons-1.0.x-dev/ui_icons.services.yml

services:
  ui_icons.search:
    class: Drupal\ui_icons\IconSearch
    arguments: ['@plugin.manager.icon_pack', '@renderer', '@cache.default']

  ui_icons.twig_extension:
    class: Drupal\ui_icons\Template\IconPreviewTwigExtension
    arguments: ['@plugin.manager.icon_pack']
    tags:
      - { name: twig.extension }