问题

我正在使用 Node.js（不是 TypeScript）的云函数 V2，并且我需要用户创建触发器。在[文档][1]中，我找到了一些内容，但它不起作用。通过链接，我还看到了以下提示：

> Firebase 的 Cloud Functions（第二代）**不支持**此指南中描述的事件和触发器。

对于 V2 云函数来说，Auth 触发器不再起作用吗？如果是这样，有没有替代的功能？以下是我的代码和部署错误：

```javascript
const {functions} = require("firebase-functions");
initializeApp();
const db = getFirestore();

exports.authUserCreated = functions.auth.user().onCreate({region: "europe-west1"}, (user) => {
  const userEmail = user.email;
  const userId = user.uid;
  return db.collection("users").doc(userId).update({createdAt: FieldValue.serverTimestamp(), email: userEmail});
});

部署错误：TypeError: 无法读取未定义的属性（读取 'auth'）

<details>
<summary>英文:</summary>

I&#39;m using cloud functions V2 with Node.js (not Typescript) and I need user creation trigger. In 
[1] I&#39;ve found something, but it doesn&#39;t work. By the link I also can see the following hint there: 

&gt; Cloud Functions for Firebase (2nd gen) **does not provide** support for
&gt; the events and triggers described in this guide.

Auth triggers doesn&#39;t work anymore for V2 cloud functions? If so, what is an alternative for this functionality? Below my code and deploy error:

    const {functions} = require(&quot;firebase-functions&quot;);
    initializeApp();
    const db = getFirestore();
    
    exports.authUserCreated = functions.auth.user().onCreate({region: &quot;europe-west1&quot;}, (user) =&gt; {
      const userEmail = user.email;
      const userId = user.uid;
      return db.collection(&quot;users&quot;).doc(userId).update({createdAt: FieldValue.serverTimestamp(), email: userEmail});
    });

Deploy error: `TypeError: Cannot read properties of undefined (reading &#39;auth&#39;)`


  [1]: https://firebase.google.com/docs/functions/auth-events

</details>


# 答案1
**得分**: 1

Your `require` statement is wrong. It should be:

```javascript
const functions = require('firebase-functions');

const functions = require('firebase-functions');