The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.entity.use.LivingEntityUseItemFinishEvent;

LivingEntityUseItemFinishEvent extends LivingEntityUseItemEvent. That means all methods available in LivingEntityUseItemEvent are also available in LivingEntityUseItemFinishEvent

Name	Type	Has Getter	Has Setter
Name resultStack	Type IItemStack	Has Getter true	Has Setter true