(firebase 9) initializeApp()对于电子邮件登录是必需的吗？

import { initializeApp } from "firebase/app";
import { getAuth, signInWithEmailAndPassword } from "firebase/auth";

// 初始化Firebase应用
const firebaseConfig = {
  apiKey: "YOUR_API_KEY",
  authDomain: "YOUR_AUTH_DOMAIN",
  projectId: "YOUR_PROJECT_ID",
  // 其他配置信息...
};

const app = initializeApp(firebaseConfig);

// 获取Auth实例
const auth = getAuth(app);

// 电子邮件登录
signInWithEmailAndPassword(auth, email, password)
  .then((userCredential) => {
    // 登录成功
    const user = userCredential.user;
    console.log("Logged in user:", user);
  })
  .catch((error) => {
    // 登录失败
    console.error("Login error:", error);
  });