No way to access the document via Query.prototype.post() method

[samislam]

I have the following code:

let query = UserModel.findOneAndUpdate({name: 'someone'}, { name: 'changed'}, { new: true, runValidators: true} )
   .post(async function(doc){
      // 👈 here, how to access the returned document?
   })

when I console.log(doc), it gives prints [Function (anonymous)] on the terminal, which I think is the next function,
and if I console.log(this) it prints the query.

How can I read the doc to run for example the .save() method?
I want to my code to look as follows:

let query = UserModel.findOneAndUpdate({name: 'someone'}, { name: 'changed'}, { new: true, runValidators: true} )
   .post(async function(doc){
     doc.updateCounter = 4
     const newlyUpdatedDoc = await updatedDoc.save()
     // or whatever code here
   })

when I run .save() as shown above it says the .save() is not a function.
What's the problem?

[vkarpov15]

let query = UserModel.findOneAndUpdate({name: 'someone'}, { name: 'changed'}, { new: true, runValidators: true} )
   .post(async function(_next, doc){
     doc.updateCounter = 4
     const newlyUpdatedDoc = await updatedDoc.save()
     // or whatever code here
   })