book_entity_type_build(array &$entity_types) Implements
template_preprocess_book_export_html(&$variables) Prepares variables for book export templates.
book_node_view(array &$build, EntityInterface $node, EntityViewDisplayInterface $display, $view_mode) Implements
template_preprocess_book_node_export_html(&$variables) Prepares variables for single node export templates
template_preprocess_book_navigation(&$variables) Prepares variables for book navigation templates.
book_node_builder($entity_type, NodeInterface $entity, &$form, FormStateInterface $form_state) Entity form
book_node_presave(EntityInterface $node) Implements
book_theme() Implements
book_form_update($form, FormStateInterface $form_state) Renders a new parent page select element when the book
book_node_predelete(EntityInterface $node) Implements
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