itemGroups
The cart items grouped by context, such as the event they belong to.
Each group in CartItemGroup contains items also present in the flat Cart.items list, but organized to
make display and contextual rendering easier (e.g. grouping by event). Useful for UI display where
grouping adds clarity.
Arguments
itemGroups doesn't take any arguments.
Type
This field resolves to [ CartItemGroup! ]!.