type ListNode<T, K> = {
  key: K;
  next: undefined | ListNode<T, K>;
  value: T;
};
type RootNode<T, K> = {
  next: undefined | ListNode<T, K>;
};

export function listGetNode<T, K>(
  list: RootNode<T, K>,
  key: ListNode<T, K>['key'],
  isDelete?: boolean
): ListNode<T, K> | undefined;
export function listGet<T, K>(
  objects: undefined | RootNode<T, K>,
  key: ListNode<T, K>['key']
): T | undefined;
export function listSet<T, K>(
  objects: RootNode<T, K>,
  key: ListNode<T, K>['key'],
  value: T
): void;
export function listHas<T, K>(
  objects: undefined | RootNode<T, K>,
  key: ListNode<T, K>['key']
): boolean;
export function listDelete<T, K>(
  objects: undefined | RootNode<T, K>,
  key: ListNode<T, K>['key']
): ListNode<T, K> | undefined;