postoffice-1.0.x-dev/extensions/postoffice_image/postoffice_image.services.yml

services:
  twig.extension.postoffice_image:
    class: Drupal\postoffice_image\Template\TwigExtension
    arguments: ['@renderer' ]
    tags:
      - { name: twig.extension }
  postoffice_image.image_embed_subscriber:
    class: \Drupal\postoffice_image\EventSubscriber\ImageEmbedSubscriber
    tags:
      - { name: event_subscriber }
  postoffice_image.image_adjustment_subscriber:
    class: \Drupal\postoffice_image\EventSubscriber\ImageAdjustmentSubscriber
    arguments: ['@request_stack']
    tags:
      - { name: event_subscriber }