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.api.event.entity.living.MCLivingEquipmentChangeEvent;

MCLivingEquipmentChangeEvent extends MCLivingEvent. That means all methods available in MCLivingEvent are also available in MCLivingEquipmentChangeEvent

Name	Type	Has Getter	Has Setter	Description
Name from	Type IItemStack	Has Getter true	Has Setter false	Description No Description Provided
Name slot	Type MCEquipmentSlotType	Has Getter true	Has Setter false	Description No Description Provided
Name to	Type IItemStack	Has Getter true	Has Setter false	Description No Description Provided