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.forge.api.event.entity.teleport.EnderPearlTeleportEvent;

EnderPearlTeleportEvent extends EntityTeleportEvent. That means all methods available in EntityTeleportEvent are also available in EnderPearlTeleportEvent

Name	Type	Has Getter	Has Setter
Name attackDamage	Type float	Has Getter true	Has Setter true
Name hitResult	Type HitResult?	Has Getter true	Has Setter false
Name pearlEntity	Type ThrownEnderpearl	Has Getter true	Has Setter false
Name player	Type ServerPlayer	Has Getter true	Has Setter false