code: public function getResizedImageInfo()
      {
          if ($this->isFastlyImageOptimizationEnabled() == false) {
              return parent::getResizedImageInfo();
          }
  
          // Return image data
          if ($this->getBaseFile() !== null) {
              return [
                  0 => $this->getWidth(),
                  1 => $this->getHeight()
              ];
          }
  
          // No image, parse the placeholder
          $asset = $this->_assetRepo->createAsset(
              "Magento_Catalog::images/product/placeholder/{$this->getDestinationSubdir()}.jpg"
          );
          $img = $asset->getSourceFile();
          $imageInfo = getimagesize($img);
  
          $this->setWidth($imageInfo[0]);
          $this->setHeight($imageInfo[1]);
  
          return $imageInfo;
      }
docs: Return resized product image information
  
  @return array