Failed to unlink file

It looks like Drupal changes permissions for js and css folders after an update, see #3369960-7: type error on drush cr → for more.

Thanks for raising the issue but I don't believe this will be an issue with the module itself; it doesn't try to mess with permissions so they'll depend on your particular filesystem's configuration.

I'll close the issue as "works as designed" but if you have info that proves me wrong, please feel free to reopen it.

Thanks!

For others, I also have my website with the webserver set as the group not the file owner, I guess we could make the web serve the owner of the files directory but I would rather not.

So after using drush frequently I get something like
...Permission denied FileSystem.php...
[error] Failed to unlink file 'assets://css/css_....

So to not see this I adda step reset permissions for the folder used by css injector.
like... chown -R user:www ./files
then su - user
then run drush.

I only have this issue with the module, it is a good module, a simple work around since this module "works as designed"