public BookManager::checkNodeIsRemovable(NodeInterface $node)

public BookNavigationCacheContext::

public BookManager::bookSubtreeData($link) Gets

public BookManager::bookTreeGetFlat(array $book_link)

protected BookManager::loadBooks() Loads

The renderer. Type:

public BookRemoveForm::buildForm(array $form, FormStateInterface

Stores flattened book trees. Type:

public static BookController::create(ContainerInterface

public BookOutlineStorageInterface::hasBooks()