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.player.PlayerSetSpawnEvent;

PlayerSetSpawnEvent extends PlayerEvent. That means all methods available in PlayerEvent are also available in PlayerSetSpawnEvent

Name	Type	Has Getter	Has Setter
Name isForced	Type boolean	Has Getter true	Has Setter false
Name newSpawn	Type BlockPos?	Has Getter true	Has Setter false
Name spawnLevel	Type ResourceLocation	Has Getter true	Has Setter false