getSourceSet example

        if (!$media instanceof Media) {
            return [];
        }

        $thumbnails = [];

        foreach ($media->getThumbnails() as $thumbnail) {
            $thumbnails[] = [
                'source' => $thumbnail->getSource(),
                'retinaSource' => $thumbnail->getRetinaSource(),
                'sourceSet' => $this->getSourceSet($thumbnail),
                'maxWidth' => $thumbnail->getMaxWidth(),
                'maxHeight' => $thumbnail->getMaxHeight(),
                'attributes' => $thumbnail->getAttributes(),
            ];
        }

        $data = [
            'id' => $media->getId(),
            'position' => null,
            'source' => $media->getFile(),
            'description' => $media->getName(),