Use shared TypeScript definitions for common types such as CollectionReference, DocumentReference, WhereFilterOp, etc.

I use Firestore both on the back-end and front-end environments. The problem is that the client library uses @firebase/firestore-types package (https://github.com/firebase/firebase-js-sdk/blob/master/packages/firestore-types/index.d.ts) while in Node.js types are defined in @firebase/firestore (https://github.com/googleapis/nodejs-firestore/blob/master/types/firestore.d.ts). For the most parts, the interfaces are identical, but because they’re defined individually, it prevents me from using shared helpers that I can use both in the browser and on the server.

For instance, I’m trying to create typed wrapper:

But I can’t make it work in both environments because it depends on defenition of CollectionReference, DocumentReference, WhereFilterOp, etc:

[garyo]

@kossnocorp this is great – Google, please consider adding this layer! Would be very helpful for all of us using Firebase on front end and back end.

[kossnocorp]

@Robula yeah, I’ve built a universal wrapper for Firestore: https://github.com/kossnocorp/typesaurus