class Nodeimport { Node } from "https://deno.land/x/velo@1.0.0/src/utils/doubly_linked_list.ts"; ConstructorsnewNode(key?: K, value?: V)Type ParametersK extends KeyVPropertiesdata: V | undefinedfrequencyCount: numberkey: K | undefinednext: Node<K, V> | undefinedprev: Node<K, V> | undefined