Summary: It'd be nice to add way to create a collection instance and automatically call map/transform any time a document gets pulled from the database.  This would make it easy for mapping libraries (https://github.com/j/type-mongo-mapper) to be used without having to create a wrapper around the collection.

Note: I know there's cursor.map and "extending cursors".  But just a simple:

const mappedCollection = db.collection('users', { map: createUserDocumentMapper() });

mappedCollection.find*() // every document will be put through the map function

Please see the link below with examples:

https://github.com/mongodb-js/mongodb-core/issues/301#issuecomment-384773766