Firebase Auth Cloud Function with Custom Claim Token Not Deploying

I'm trying to create a function that attaches a custom claim on to a specific user when they create an auth account through my sign in. When I try to push the function to Firebase cloud functions, I get this error:

firebase deploy --only functions

=== Deploying to 'project-name'...

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run lint

> lint
> eslint .

+  functions: Finished running predeploy script.
i  functions: preparing codebase default for deployment
i  functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i  functions: ensuring required API cloudbuild.googleapis.com is enabled...
i  artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled...
+  functions: required API cloudfunctions.googleapis.com is enabled
+  artifactregistry: required API artifactregistry.googleapis.com is enabled
+  functions: required API cloudbuild.googleapis.com is enabled
i  functions: Loading and analyzing source code for codebase default to determine what to deploy  
Serving at port 8747

TypeError: Cannot read properties of undefined (reading 'user')
    at Object.<anonymous> (C:\Repos-local\project-vue-client\functions\index.js:10:50)
    at Module._compile (node:internal/modules/cjs/loader:1730:14)
    at Object..js (node:internal/modules/cjs/loader:1895:10)
    at Module.load (node:internal/modules/cjs/loader:1465:32)
    at Function._load (node:internal/modules/cjs/loader:1282:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
    at Module.require (node:internal/modules/cjs/loader:1487:12)
    at require (node:internal/modules/helpers:135:16)
    at loadModule (C:\Repos-local\project-vue-client\functions\node_modules\firebase-functions\lib\runtime\loader.js:40:16)

I've tried using the exact google documentation, and that doesn't work either. Here is my functions/index.js:

const functions = require('firebase-functions')
const { initializeApp } = require('firebase-admin/app');
const { getAuth } = require('firebase-admin/auth');

initializeApp();

// --- Function 1: Set Initial Claims for New Users ---
// This function automatically runs before a new Firebase Auth user is created.
// It sets the 'admin' custom claim to 'false' by default.
exports.setAdminPrivilegesFalse = functions.auth.user().onCreate(async user => {
  //Check if user meets role criteria
  if(user.email === 'example@email.com') {
    const customClaims = { admin: true };

    //Add the custom claims to the account
    try {
      await getAuth().setCustomUserClaims(user.uid, customClaims);
      //Log success
      console.log(`User ${user.email} now has admin privileges`);
    } catch (error) {
      console.log(error);
    }
  }
});

I'm trying to run firebase deploy --only functions. Here is the site I used for reference. Thank you in advance for any help!

https://firebase.google.com/docs/auth/admin/custom-claims#node.js_3

I tried running the following installs:

npm i firebase-tools
npm install firebase-admin@latest
npm install firebase-functions@latest
npm install firebase@latest
npm install -g firebase-tools
npm install

I checked and I have the blaze plan on firebase, and my project is connected to Firebase, auth works everywhere else.

Most likely you're using the latest version of the Firebase Admin SDK, and it prefers/requires your Cloud Functions to use 2nd generation syntax.

Since I don't think the auth triggers have changed in quite some time, you might want to pin your firebase-functions dependency to version 5.1.1 (the last release before version 6.0.0 that made 2nd gen syntax the default) in your package.json:

"dependencies": {
  ...
  "firebase-functions": "^5.1.1" // 👈 This pins the version
},

Alternatively (and probably better) is to use the latest firebase-functions and fix the import to import the v1 signature (based on Doug's answer that I linked below):

const functions = require("firebase-functions/v1");

Also see:

• Firebase Cloud Functions. why is functions.auth.user() undefined?
• Declaring Firebase auth trigger error: "TypeError: Cannot read properties of undefined (reading 'user')"