wxt-8.x-3.011/modules/custom/wxt_ext/wxt_ext_media/wxt_ext_media.services.yml

services:
  wxt.media_helper:
    class: '\Drupal\wxt_ext_media\MediaHelper'
    arguments:
      - '@entity_type.manager'

  wxt_ext_media.route_subscriber:
    class: '\Drupal\wxt_ext_media\Routing\RouteSubscriber'
    tags:
      -
        name: event_subscriber