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.EntityJoinWorldEvent;

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

Name	Type	Has Getter	Has Setter
Name world	Type Level	Has Getter true	Has Setter false