gradle
8.2

# optional

abstract fun optional(): TaskInputFilePropertyBuilder

Marks a task property as optional. This means that a value does not have to be specified for the property, but any value specified must meet the validation constraints for the property.

abstract fun optional(optional: Boolean): TaskInputFilePropertyBuilder

Sets whether the task property is optional. If the task property is optional, it means that a value does not have to be specified for the property, but any value specified must meet the validation constraints for the property.