OnCreate Error

[JohannesMilke]

Hello I'm trying to write a function so that i can change the data when a user was created. The following doesn't work. What am I doing wrong?

Doesn't it work with my model object of the user since i have some dependencies in this package

name: foundation
description: A starting point for Dart libraries or applications.
# version: 1.0.0
# homepage: https://www.example.com

environment:
  sdk: '>=2.5.0 <3.0.0'

dependencies:
  quiver: ^2.0.5

  intl: ^0.16.0

dev_dependencies:
  pedantic: ^1.8.0
  test: ^1.6.0

I'm getting all the time in the logs errors like these however there is no useable information inside.

TypeError: u.bx is not a function
    at Object.lJ (/srv/build/node/index.dart.js:1628:63)
    at fq.mv (/srv/build/node/index.dart.js:1756:5)
    at dX.aW (/srv/build/node/index.dart.js:3771:5)
    at dZ.$2 (/srv/build/node/index.dart.js:3775:32)
    at Object.lP (/srv/build/node/index.dart.js:187:112)
    at me (/srv/build/node/index.dart.js:1424:10)
    at /srv/build/node/index.dart.js:1418:42
    at cloudFunction (/srv/node_modules/firebase-functions/lib/cloud-functions.js:131:23)
    at /worker/worker.js:825:24
    at <anonymous>

Here is the code I tried:

void main() {
  functions['createUser'] =
      functions.firestore.document('/users/{userId}').onCreate(createUser);
}

FutureOr<void> createUser(DocumentSnapshot snap, EventContext context) {
  final user = User.fromJson(snap.data.toMap());
  final newUser = user.copy(idUser: 'hello_word');

  final newDoc = DocumentData.fromMap(newUser.toJson());

  return snap.reference.setData(newDoc);
}