IItemStackSupplier
Link to iitemstacksupplier
The IItemStackSupplier function can be added to a Creative Tab and is used to provide the IItemStack to be used as the tab's icon.
Импорт пакета
Link to импорт-пакета
It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.IItemStackSupplier;
Parameters
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The IItemStackSupplier Function is a function with no parameters. The function needs to return an IItemStack.