TieredItem
Importing the class
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.
Extending ItemDefinition
TieredItem extends ItemDefinition. That means all methods available in ItemDefinition are also available in TieredItem
Methods
Gets the tier of this item.
Returns: The IItemTier of this item.
Return Type: Tier