drupal/core/modules/book/book.services.yml

services:
  book.breadcrumb:
    class: Drupal\book\BookBreadcrumbBuilder
    arguments: ['@entity.manager', '@access_manager', '@current_user']
    tags:
      - { name: breadcrumb_builder, priority: 701 }
  book.manager:
    class: Drupal\book\BookManager
    arguments: ['@entity.manager', '@string_translation', '@config.factory', '@book.outline_storage']
  book.outline:
    class: Drupal\book\BookOutline
    arguments: ['@book.manager']
  book.export:
    class: Drupal\book\BookExport
    arguments: ['@entity.manager', '@book.manager']
  book.outline_storage:
    class: Drupal\book\BookOutlineStorage
    arguments: ['@database']
    tags:
      - { name: backend_overridable }
  access_check.book.removable:
    class: Drupal\book\Access\BookNodeIsRemovableAccessCheck
    arguments: ['@book.manager']
    tags:
      - { name: access_check, applies_to: _access_book_removable }