All of the symbols in the driver need to be correctly marked as public or internal, you can use api extractor to discover a list of symbols that have yet to be annotated. When the symbols have been annotated many may be removed from src/index.ts since they are no longer public.

a good rule of thumb is that only things exposed from the MongoClient , Db, Collection, GridFS and cursor types (including ChangeStream) should be exported, meanwhile SDAM, CMAP, should be  internal, although we do technically expose the TopologyDescription.

YMMV, You can use the npm run build:docs and open docs/public/index.html to get a good quick glance at the public types