MenuLinkContent::baseFieldDefinitions

public static MenuLinkContent::baseFieldDefinitions(EntityTypeInterface $entity_type)

$fields['name'] = BaseFieldDefinition::create('string')
  ->setLabel(t('Name'));

public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
  /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
  $fields = parent::baseFieldDefinitions($entity_type);

  $fields['id']->setLabel(t('Entity ID'))
    ->setDescription(t('The entity ID for this menu link content entity.'));

  $fields['uuid']->setDescription(t('The content menu link UUID.'));

  $fields['langcode']->setDescription(t('The menu link language code.'));

  $fields['bundle']
  ->setDescription(t('The content menu link bundle.'))
    ->setSetting('max_length', EntityTypeInterface::BUNDLE_MAX_LENGTH)
    ->setSetting('is_ascii', TRUE);

  $fields['title'] = BaseFieldDefinition::create('string')
    ->setLabel(t('Menu link title'))
    ->setDescription(t('The text to be used for this link in the menu.'))
    ->setRequired(TRUE)
    ->setTranslatable(TRUE)
    ->setSetting('max_length', 255)
    ->setDisplayOptions('view', array(
      'label' => 'hidden',
      'type' => 'string',
      'weight' => -5,
    ))
    ->setDisplayOptions('form', array(
      'type' => 'string_textfield',
      'weight' => -5,
    ))
    ->setDisplayConfigurable('form', TRUE);

  $fields['description'] = BaseFieldDefinition::create('string')
    ->setLabel(t('Description'))
    ->setDescription(t('Shown when hovering over the menu link.'))
    ->setTranslatable(TRUE)
    ->setSetting('max_length', 255)
    ->setDisplayOptions('view', array(
      'label' => 'hidden',
      'type' => 'string',
      'weight' => 0,
    ))
    ->setDisplayOptions('form', array(
      'type' => 'string_textfield',
      'weight' => 0,
    ));

  $fields['menu_name'] = BaseFieldDefinition::create('string')
    ->setLabel(t('Menu name'))
    ->setDescription(t('The menu name. All links with the same menu name (such as "tools") are part of the same menu.'))
    ->setDefaultValue('tools')
    ->setSetting('is_ascii', TRUE);

  $fields['link'] = BaseFieldDefinition::create('link')
    ->setLabel(t('Link'))
    ->setDescription(t('The location this menu link points to.'))
    ->setRequired(TRUE)
    ->setSettings(array(
      'link_type' => LinkItemInterface::LINK_GENERIC,
      'title' => DRUPAL_DISABLED,
    ))
    ->setDisplayOptions('form', array(
      'type' => 'link_default',
      'weight' => -2,
    ));

  $fields['external'] = BaseFieldDefinition::create('boolean')
    ->setLabel(t('External'))
    ->setDescription(t('A flag to indicate if the link points to a full URL starting with a protocol, like http:// (1 = external, 0 = internal).'))
    ->setDefaultValue(FALSE);

  $fields['rediscover'] = BaseFieldDefinition::create('boolean')
    ->setLabel(t('Indicates whether the menu link should be rediscovered'))
    ->setDefaultValue(FALSE);

  $fields['weight'] = BaseFieldDefinition::create('integer')
    ->setLabel(t('Weight'))
    ->setDescription(t('Link weight among links in the same menu at the same depth. In the menu, the links with high weight will sink and links with a low weight will be positioned nearer the top.'))
    ->setDefaultValue(0)
    ->setDisplayOptions('view', array(
      'label' => 'hidden',
      'type' => 'integer',
      'weight' => 0,
    ))
    ->setDisplayOptions('form', array(
      'type' => 'number',
      'weight' => 20,
    ));

  $fields['expanded'] = BaseFieldDefinition::create('boolean')
    ->setLabel(t('Show as expanded'))
    ->setDescription(t('If selected and this menu link has children, the menu will always appear expanded.'))
    ->setDefaultValue(FALSE)
    ->setDisplayOptions('view', array(
      'label' => 'hidden',
      'type' => 'boolean',
      'weight' => 0,
    ))
    ->setDisplayOptions('form', array(
      'settings' => array('display_label' => TRUE),
      'weight' => 0,
    ));

  $fields['enabled'] = BaseFieldDefinition::create('boolean')
    ->setLabel(t('Enabled'))
    ->setDescription(t('A flag for whether the link should be enabled in menus or hidden.'))
    ->setDefaultValue(TRUE)
    ->setDisplayOptions('view', array(
      'label' => 'hidden',
      'type' => 'boolean',
      'weight' => 0,
    ))
    ->setDisplayOptions('form', array(
      'settings' => array('display_label' => TRUE),
      'weight' => -1,
    ));

  $fields['parent'] = BaseFieldDefinition::create('string')
    ->setLabel(t('Parent plugin ID'))
    ->setDescription(t('The ID of the parent menu link plugin, or empty string when at the top level of the hierarchy.'));

  $fields['changed'] = BaseFieldDefinition::create('changed')
    ->setLabel(t('Changed'))
    ->setDescription(t('The time that the menu link was last edited.'))
    ->setTranslatable(TRUE);

  return $fields;
}