chore: replace v1 auth package with identity

functions/index.js

@@ -1,4 +1,4 @@
-import { auth, logger } from 'firebase-functions/v1'; // v2 does not support auth triggers as of july/23
+import { logger } from 'firebase-functions/v2';
 import {
   onDocumentUpdated,
   onDocumentCreated,
@@ -8,6 +8,7 @@ import {
   onObjectFinalized,
   onObjectDeleted,
 } from 'firebase-functions/v2/storage';
+import { beforeUserCreated } from 'firebase-functions/v2/identity';
 import { https } from 'firebase-functions/v2';
 import { defineSecret } from 'firebase-functions/params';
 import { safelyInitializeApp } from './firebase.js';
@@ -38,11 +39,11 @@ const config = safelyInitializeApp();
 const sendGridApiKey = defineSecret('SENDGRID_API_KEY');
 
 // Firebase authentication
-export const onCreateUser = auth.user().onCreate(async (user) => {
+export const onCreateUser = beforeUserCreated(async (event) => {
   logger.debug('[auth::user::onCreate] importing createUser');
   const createUser = (await import('./auth/onCreate.js')).createUser;
 
-  const result = await createUser(user);
+  const result = await createUser(event.data);
 
   logger.debug('[auth::user::onCreate]', result);