src/Subjects/ExportableTrait.php
protected function appendArtefacts($type, array $artefacts)
    {
        foreach ($artefacts as $artefact) {
            $this->artefacs[$type][$this->getLastEntityId()][] = $artefact;
        }
    }
protected function appendArtefacts($type, array $artefacts)
    {
        foreach ($artefacts as $artefact) {
            $this->artefacs[$type][$this->getLastEntityId()][] = $artefact;
        }
    }
Append's the passed product type artefacts to the product with the
last entity ID.

@param string $type      The artefact type, e. g. configurable
@param array  $artefacts The product type artefacts

@return void