method BinarySearchTree.prototype.traversePreOrderRe-exportimport { BinarySearchTree } from "https://deno.land/x/masx200_leetcode_test@10.6.2/deps.ts"; traversePreOrder(cb: (node: BinarySearchTreeNode<T>) => void): voidParameterscb: (node: BinarySearchTreeNode<T>) => voidReturnsvoid