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.living.LivingEquipmentChangeEvent;

LivingEquipmentChangeEvent extends LivingEvent. That means all methods available in LivingEvent are also available in LivingEquipmentChangeEvent

Name	Type	Has Getter	Has Setter
Name from	Type IItemStack	Has Getter true	Has Setter false
Name slot	Type EquipmentSlot	Has Getter true	Has Setter false
Name to	Type IItemStack	Has Getter true	Has Setter false