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.

import crafttweaker.api.item.ItemStack;

Return Type: IIngredient

ItemStack.asIIngredient() as IIngredient
myItemStack.asIIngredient();

Return Type: IItemStack

ItemStack.asIItemStack() as IItemStack
myItemStack.asIItemStack();

Debug method, expect this to be removed anytime!

Return Type: void

ItemStack.print() as void
myItemStack.print();