mymodule_entity_field_storage_info example

function hook_entity_bundle_field_info(\Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
  // Add a property only to nodes of the 'article' bundle.   if ($entity_type->id() == 'node' && $bundle == 'article') {
    $fields = [];
    $storage_definitions = mymodule_entity_field_storage_info($entity_type);
    $fields['mymodule_bundle_field'] = FieldDefinition::createFromFieldStorageDefinition($storage_definitions['mymodule_bundle_field'])
      ->setLabel(t('Bundle Field'));
    return $fields;
  }

}

/** * Alter bundle field definitions. * * @param \Drupal\Core\Field\FieldDefinitionInterface[] $fields * The array of bundle field definitions. * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type * The entity type definition. * @param string $bundle * The bundle. * * @see hook_entity_base_field_info() * @see hook_entity_base_field_info_alter() * @see hook_entity_bundle_field_info() * * @todo WARNING: This hook will be changed in * https://www.drupal.org/node/2346347. */