Mongoose + Typescript requires me to extend Document

I'm trying to follow the instructions given in the Mongoose documentation for their support of TypeScript: https://mongoosejs.com/docs/typescript.html.

In the docs, they provide the following example:

import { Schema, model, connect } from 'mongoose';

// 1. Create an interface representing a document in MongoDB.
interface User {
  name: string;
  email: string;
  avatar?: string;
}

// 2. Create a Schema corresponding to the document interface.
const schema = new Schema<User>({
  name: { type: String, required: true },
  email: { type: String, required: true },
  avatar: String
});

// 3. Create a Model.
const UserModel = model<User>('User', schema);

They also provide an alternative example where the interface is extending Document:

interface User extends Document {
  name: string;
  email: string;
  avatar?: string;
}

They recommend not to use the approach of extending the Document. However, when I try their exact code (without extends) I get the following errors:

Type 'User' does not satisfy the constraint 'Document<any, {}>'.
  Type 'User' is missing the following properties from type 'Document<any, {}>': $getAllSubdocs, $ignore, $isDefault, $isDeleted, and 47 more.

I'm using Mongoose v 5.12.7. Is there something I don't understand about this? How can I create the schema without extending the document? I want to test it later on, and I don't want to have to mock 47 or more properties...