The event is cancelable.

If the event is canceled, it will deny the entity to join the world

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.MCEntityJoinWorldEvent;

MCEntityJoinWorldEvent extends MCEntityEvent. That means all methods available in MCEntityEvent are also available in MCEntityJoinWorldEvent

名称	类型	可获得	可设置	描述
名称 world	类型 MCWorld	可获得 true	可设置 false	描述 No Description Provided