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
 Copy
import crafttweaker.api.item.tiered.ItemTier;

ItemTier implements the following interfaces. That means all methods defined in these interfaces are also available in ItemTier

• IItemTier

ItemTier is an enum. It has 6 enum constants. They are accessible using the code below.

ZenScript
 Copy
ItemTier.WOOD
ItemTier.STONE
ItemTier.IRON
ItemTier.DIAMOND
ItemTier.GOLD
ItemTier.NETHERITE