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.living.spawn.LivingCheckSpawnEvent;

LivingCheckSpawnEvent extends LivingSpawnEvent. That means all methods available in LivingSpawnEvent are also available in LivingCheckSpawnEvent

Name	Type	Has Getter	Has Setter
Name isSpawner	Type boolean	Has Getter true	Has Setter false
Name spawnReason	Type MobSpawnType	Has Getter true	Has Setter false
Name spawner	Type BaseSpawner?	Has Getter true	Has Setter false