Book outline storage. Type:

protected BookManager::bookTreeBuild($bid, array $parameters = array())

public BookManager::saveBookLink(array $link, $new)

Defines the maximum supported depth of the book tree. File core/modules/book/src/BookManager.php, line

The book manager. Type:

public BookManager::loadBookLinks($nids, $translate = TRUE)

BookManager service. Type:

protected BookSettingsForm::getEditableConfigNames()

public BookOutlineStorageInterface::getBookMenuTree($bid

public BookOutlineForm::save(array $form, FormStateInterface