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Deno.test("implement-trie-ii-prefix-tree", () => {    const trie: Trie = new Trie();    trie.insert("apple"); // Inserts "apple".    trie.insert("apple"); // Inserts another "apple".    assertEquals(2, trie.countWordsEqualTo("apple")); // There are two instances of "apple" so return 2.    assertEquals(2, trie.countWordsStartingWith("app")); // "app" is a prefix of "apple" so return 2.    trie.erase("apple"); // Erases one "apple".    assertEquals(1, trie.countWordsEqualTo("apple")); // Now there is only one instance of "apple" so return 1.    assertEquals(1, trie.countWordsStartingWith("app")); // return 1    trie.erase("apple"); // Erases "apple". Now the trie is empty.    assertEquals(0, trie.countWordsStartingWith("app")); // return 0});import { assertEquals } from "../deps.ts";import Trie from "./index.ts";