Typescript doc exemple for query helpers does not seem to work

[MathieuFouillet]

Do you want to request a feature or report a bug?

It's either a bug or an issue with the doc.

What is the current behavior?

I can't create the simple query helper from the doc. I have these 2 errors :

• TS2339: Property 'byName' does not exist on type '{}'.
• TS2339: Property 'find' does not exist on type '{}'.

import { Document, Model, Query, Schema, connect, model } from 'mongoose';

interface Project {
  name: string;
  stars: number;
}

const schema = new Schema<Project>({
  name: { type: String, required: true },
  stars: { type: Number, required: true }
});
// Query helpers should return `Query<any, Document<DocType>> & ProjectQueryHelpers`
// to enable chaining.
interface ProjectQueryHelpers {
  byName(name: string): Query<any, Document<Project>> & ProjectQueryHelpers;
}
schema.query.byName = function(name): Query<any, Document<Project>> & ProjectQueryHelpers {
  return this.find({ name: name });
};

// 2nd param to `model()` is the Model class to return.
const ProjectModel = model<Project, Model<Project, ProjectQueryHelpers>>('Project', schema);

run().catch(err => console.log(err));

async function run(): Promise<void> {
  await connect('mongodb://localhost:27017/test');
  
  // Equivalent to `ProjectModel.find({ stars: { $gt: 1000 }, name: 'mongoose' })`
  await ProjectModel.find().where('stars').gt(1000).byName('mongoose');
}

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.

• node v14.15.4
• "typescript": "^4.6.3"
• "mongoose": "^6.3.1"
• mongodb: 4.4.6
• tsconfig.json

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "display": "Node 14",

  "compilerOptions": {
    "lib": ["es2020"],
    "module": "commonjs",
    "target": "es2020",

    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  }
}

[IslandRhythms]

Does not happen on 6.3.0