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.FinalizeMobSpawnEvent;

FinalizeMobSpawnEvent extends MobSpawnEvent. That means all methods available in MobSpawnEvent are also available in FinalizeMobSpawnEvent

Name	Type	Has Getter	Has Setter
Name difficulty	Type DifficultyInstance	Has Getter true	Has Setter true
Name isSpawnCancelled	Type boolean	Has Getter true	Has Setter false
Name spawnCancelled	Type FinalizeMobSpawnEvent	Has Getter false	Has Setter true
Name spawnTag	Type IData?	Has Getter true	Has Setter true
Name spawnType	Type MobSpawnType	Has Getter true	Has Setter false
Name spawner	Type BaseSpawner?	Has Getter true	Has Setter false