typescript type override for find and populate

[vkarpov15]

Discussed in #11014

^{Originally posted by falukropp November 24, 2021}
Starting with https://mongoosejs.com/docs/typescript/populate.html but using find instead of findOne, should not the following work?

import {Schema, model, Document, Types} from 'mongoose'

// `Parent` represents the object as it is stored in MongoDB
interface Parent {
  child?: Types.ObjectId
  name?: string
}
interface Child {
  name: string
}
interface PopulatedParent {
  child: Child | null
}
const ParentModel = model<Parent>(
  'Parent',
  new Schema({
    child: {type: 'ObjectId', ref: 'Child'},
    name: String
  })
)
const childSchema: Schema = new Schema({name: String})
const ChildModel = model<Child>('Child', childSchema)

// Populate with `Paths` generic `{ child: Child }` to override `child` path
ParentModel.find({})
  .populate<{child: Child}>('child')
  .orFail()
  .then(parents => {
// Property 'name' does not exist on type 'ObjectId'.
    parents.map(p => p.child.name)
  })

I get
Property 'name' does not exist on type 'ObjectId' on p.child.name

...Or do you do something else for multiple results?

This is on mongoose 6.0.13