AnvilUpdateEvent is fired when the inputs (either input stack, or the name) of an anvil are changed. You can listen to this event to add custom anvil recipes.

The event is cancelable.

If the event is canceled, vanilla behavior will not run, and the output will be set to <item:minecraft:air>.

If the event is not canceled, but the output is not empty, it will set the output and not run vanilla behavior.

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.api.event.AnvilUpdateEvent;

AnvilUpdateEvent extends Event. That means all methods available in Event are also available in AnvilUpdateEvent

Nome	Tipo	Ha Getter	Ha Setter
Nome left	Tipo IItemStack	Ha Getter sì	Ha Setter no
Nome levelCost	Tipo int	Ha Getter sì	Ha Setter sì
Nome materialCosto	Tipo int	Ha Getter sì	Ha Setter sì
Nome nome	Tipo string?	Ha Getter sì	Ha Setter no
Nome output	Tipo IItemStack	Ha Getter sì	Ha Setter sì
Nome player	Tipo Player?	Ha Getter sì	Ha Setter no
Nome right	Tipo IItemStack	Ha Getter sì	Ha Setter no