parseVariantString example

public function onAfterImportRecord(ImportExportAfterImportRecordEvent $event): void
    {
        $row = $event->getRow();
        $entityName = $event->getConfig()->get('sourceEntity');
        $entityWrittenEvents = $event->getResult()->getEvents();

        if ($entityName !== ProductDefinition::ENTITY_NAME || empty($row['variants']) || !$entityWrittenEvents) {
            return;
        }

        $variants = $this->parseVariantString($row['variants']);

        $entityWrittenEvent = $entityWrittenEvents->filter(fn ($event) => $event instanceof EntityWrittenEvent && $event->getEntityName() === ProductDefinition::ENTITY_NAME)->first();

        if (!$entityWrittenEvent instanceof EntityWrittenEvent) {
            return;
        }

        $writeResults = $entityWrittenEvent->getWriteResults();

        if (empty($writeResults)) {
            return;
        }