muser-8.x-1.x-dev/modules/custom/muser_system/muser_system.services.yml

services:
  muser_system.route_subscriber:
    class: Drupal\muser_system\Routing\MuserSystemAlterRouteSubscriber
    tags:
      - { name: event_subscriber }
  muser_system.add_node_access:
    class: Drupal\muser_system\Access\AddNodeAccessCheck
    arguments: ['@current_user']
    tags:
      - { name: access_check, applies_to: _muser_system_node_add_access }