The repository has an example code of using two different schema with validation in a same modal.
Since, this is just for testing discriminators
feature of mongoose, I have used a basic express app to demonstrate. more details here.
I am assuming you have mongodb running on 127.0.0.1:27017
npm i
npx nodemon ./bin/www
Finally, hit localhost:3000/employee
and check the mongoDB collection to see the added records.