The event is not cancelable.

The event does not have a result.

Importing the class

Link to importing-the-class

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.api.event.block.MCCropGrowEvent;

Extending MCBlockEvent

Link to extending-mcblockevent

MCCropGrowEvent extends MCBlockEvent. That means all methods available in MCBlockEvent are also available in MCCropGrowEvent