ItemStack

This is the vanilla ItemStack. It is recommended that you use IItemStack whenever possible

They can be cast from each other, though.

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.item.ItemStack;

ItemStack extends CapabilityProvider<ItemStack>. That means all methods available in CapabilityProvider<ItemStack> are also available in ItemStack

ZenScript
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// ItemStack.asIIngredient() as IIngredient

myItemStack.asIIngredient();

ZenScript
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// ItemStack.asIItemStack() as IItemStack

myItemStack.asIItemStack();