public FieldStorageDefinitionInterface::isBaseField()
Determines whether the field is a base field.
Base fields are not specific to a given bundle or a set of bundles. This excludes configurable fields, as they are always attached to a specific bundle.
bool Whether the field is a base field.
public function isBaseField();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldStorageDefinitionInterface.php/function/FieldStorageDefinitionInterface::isBaseField/8.1.x