ILocalizedNameSupplier

The ILocalizedNameSupplier function is used to programmatically determine an Item's display name.

If you want to import the function's class, here you go:

ZenScript
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import mods.contenttweaker.LocalizedNameSupplier;

The function returns a string and takes an IItemStack as single input parameter.

ZenScript
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item.setLocalizedNameSupplier(function(itemStack) {
    return "mySuperItem";
});