class TypedDataInternalPropertiesHelper

class TypedDataInternalPropertiesHelper {
    
    /**
     * Gets an array non-internal properties from a complex data object.
     *
     * @param \Drupal\Core\TypedData\ComplexDataInterface $data
     *   The complex data object.
     *
     * @return \Drupal\Core\TypedData\TypedDataInterface[]
     *   The non-internal properties, keyed by property name.
     */
    public static function getNonInternalProperties(ComplexDataInterface $data) {
        return array_filter($data->getProperties(TRUE), function (TypedDataInterface $property) {
            return !$property->getDataDefinition()
                ->isInternal();
        });
    }

}