instance method validate_transformation

# File activestorage/lib/active_storage/transformers/image_processing_transformer.rb, line 342
        def validate_transformation(name, argument)
          method_name = name.to_s.gsub("-","_")

          unless SUPPORTED_IMAGE_PROCESSING_METHODS.any? { |method| method_name == method }
            raise UnsupportedImageProcessingMethod, <<~ERROR.squish
              One or more of the provided transformation methods is not supported.
            ERROR
          end

          if argument.present?
            if argument.is_a?(String) || argument.is_a?(Symbol)
              validate_arg_string(argument)
            elsif argument.is_a?(Array)
              validate_arg_array(argument)
            elsif argument.is_a?(Hash)
              validate_arg_hash(argument)
            end
          end
        end