Whether the node is being previewed or not. The variable is set to public as it will give a considerable performance improvement. See

public Node::setRevisionCreationTime($timestamp) Sets

public Node::getRevisionCreationTime() Gets

public Node::setPublished($published) Sets

public Node::access($operation = 'view', AccountInterface $account = NULL, $return_as_object

public Node::setTitle($title) Sets the

public Node::getOwner() Returns the entity

public Node::getTitle() Gets the node title

public Node::getOwnerId() Returns the entity

public static Node::preDelete(EntityStorageInterface $storage, array $entities)