Added Datastore.findOpts(query, opts, callback)

[iyobo]

findOpts is an extended version of the find function, where the 2nd parameter (previously just projections) is now used to pass in fields (aka projections), paging, and sort values which, for the most part, eliminates the need to return a cursor.

This function will never return a cursor and will always expect the last parameter to be a callback, keeping it auto-promisification compliant.

i.e. With this function, you can now run promise.promisifyAll(...) on an instance of Datastore to be able to use await or yield on findOptsAsync with all working find features whereas simply using findAsync function would be severely handicapped as it would not be able to page or sort.

[PopovMP]

Yes, this make sense. However, I would recommend adding additional options to the standard find, findOne and count projection as: $skip, $limit, and $sort instead of adding new command.
Example:
db.find({}, {username: 1, email: 1, _id: 0, $skip: 20, $limit: 10, $sort: {username: 1} }, callback)

[iyobo]

The main issue with that is neither count nor findOne are paged or sorted.
Secondarily, it's rather messy.

The criteria should remain seperate from query options.

[PopovMP]

You may be right. However, I don't think we should add this pull request to the official distribution.
You may make a wrapper for NeDB with that functionality that will work over the original package.

I hope @louischatriot will take a clever decision.