drupal/core/modules/user/user.services.yml

services:
  access_check.permission:
    class: Drupal\user\Access\PermissionAccessCheck
    tags:
      - { name: access_check }
  access_check.user.register:
    class: Drupal\user\Access\RegisterAccessCheck
    tags:
      - { name: access_check }
  access_check.user.role:
    class: Drupal\user\Access\RoleAccessCheck
    tags:
      - { name: access_check }
  access_check.user.login_status:
    class: Drupal\user\Access\LoginStatusCheck
    tags:
      - { name: access_check }
  user.data:
    class: Drupal\user\UserData
    arguments: ['@database']
  user.autocomplete:
    class: Drupal\user\UserAutocomplete
    arguments: ['@database', '@config.factory']
  user_maintenance_mode_subscriber:
    class: Drupal\user\EventSubscriber\MaintenanceModeSubscriber
    tags:
      - { name: event_subscriber }
  theme.negotiator.user:
    class: Drupal\user\Theme\UserNegotiator
    arguments: ['@entity.manager', '@current_user']
    tags:
      - { name: theme_negotiator, priority: -50 }
  theme.negotiator.admin_theme:
    class: Drupal\user\Theme\AdminNegotiator
    arguments: ['@current_user', '@config.factory', '@entity.manager']
    tags:
      - { name: theme_negotiator, priority: -40 }