We revive the PR from the 2024 proof-of-concept implementation of this feature. Its general structure remains the same:

• We add generics to classes like Mongo, Database and Collection that allow describing the schema of the collection(s) they refer to.
• We use api-extractor to extract a single TS file from those generics.
• We perform post-processing on that TS file using babel to adjust return types from : Promise<T> to : T where appropriate, to account for mongosh’s async rewriting logic.

We are making a number of adjustments to productionize it:

• Instead of piggy-backing on top of the existing index.ts file, we create a separate entry point file that is only used for generating the TS definitions for the mongosh API.
• We include other objects like rs, sp and sh in the generated TS definitions, and methods hanging off the ShellApi object. (MONGOSH-2173)
• We add documentation comments to commonly used methods and ensure that they are included in the generated TS file. (MONGOSH-2171)
• Stretch Goal: We use the version information available to us in existing shell decorators to generate different TS files for different major server versions. MONGOSH-2172