declare namespace VanX
{
    type StateOf<T> = { readonly [K in keyof T]: Van.State<T[K]> }
    type ValueType<T> = T extends (infer V)[] ? V : T[keyof T]
    type KeyType<T> = T extends unknown[] ? number : string
    type ReplacementFunc<T> =
        T extends (infer V)[] ? (items: V[]) => readonly V[] :
        (items: [string, T[keyof T]][]) => readonly [string, T[keyof T]][]
}