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

Name	Type	Has Getter	Has Setter	Description
Name world	Type MCWorld	Has Getter true	Has Setter false	Description No Description Provided