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.BonemealEvent;

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

Name	Type	Has Getter	Has Setter
Name block	Type BlockState	Has Getter true	Has Setter false
Name level	Type Level	Has Getter true	Has Setter false
Name pos	Type BlockPos	Has Getter true	Has Setter false
Name stack	Type IItemStack	Has Getter true	Has Setter false