I know there's already an effort in progress to remove all deprecated code, but I see it targets the next major version (version 3).
The following problem can be addressed in version 2 without affecting BC, it's a simpler one:
Method "Symfony\Component\Form\AbstractType::configureOptions()" might add "void" as a native return type declaration in the future. Do the same in child class "Liip\ImagineBundle\Form\Type\ImageType" now to avoid errors or add an explicit @return annotation to suppress this message.
Just add the needed return type to the class methods.
I know there's already an effort in progress to remove all deprecated code, but I see it targets the next major version (version 3). The following problem can be addressed in version 2 without affecting BC, it's a simpler one:
Just add the needed return type to the class methods.