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.ItemEvent;

ItemEvent extends EntityEvent. That means all methods available in EntityEvent are also available in ItemEvent

名称	类型	可获得	可设置
名称 entityItem	类型 ItemEntity	可获得 true	可设置 false