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.