method RBTree.prototype.removeFixupimport { RBTree } from "https://dotland.deno.dev/std@0.146.0/collections/rb_tree.ts"; removeFixup(parent: RedBlackNode<T> | null, current: RedBlackNode<T> | null)Parametersparent: RedBlackNode<T> | nullcurrent: RedBlackNode<T> | null