MimeTypeGuesser::guess() is deprecated

Can confirm that this resolved the issue on Drupal 10.1.5.

RTBC+1, thanks!

Patch #2 fixes the issue for me. However, I don't think if condition in the patch is necessary. Service file.mime_type.guesser is provided by the class Drupal\Core\File\MimeType\MimeTypeGuesser which implements interface Symfony\Component\Mime\MimeTypeGuesserInterface. I don't see an opportunity to ever get anything else.

This should be sufficient:

-      $image->filemime = \Drupal::service('file.mime_type.guesser')->guess($image_path);
+      $image->filemime = \Drupal::service('file.mime_type.guesser')->guessMimeType($image_path);

@vaish In Drupal core < 10 this was not the case. The if condition is needed to not break backward compatibility.

@czigor You are right, I did overlook backward compatibility. However, Drupal 9 should not be a problem, unless you are on a very old version. Method ::guessMimeType() is available since Drupal 9.1 (but not in Drupal 9.0). So problem exists with Drupal 9.0 and 8.x and I did overlook that this module still claims the compatibility with Drupal 8.9.

Drupal 9: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21File%21Mi...