A UICollectionViewDataSource that will use a ViewModel representation of the items inside the collection

CollectionViewModel.swift

protocol ItemViewModel {
    
    var reuseIdentifier: String { get }
    
    func setup(_ cell: UICollectionReusableView, in collectionView: UICollectionView, at indexPath: IndexPath)
}

protocol SectionViewModel {
    
    var headerItem: ItemViewModel? { get }
    
    var items: [ItemViewModel] { get }
    
    var footer: ItemViewModel? { get }
    
    func model(for elementOfKind: String) -> ItemViewModel?
}