Any tips or example for using Firestore with MobX

I am doing a NextJs app and I just need state management and Firestore intergration. Redux is too complicated for this job within time limit at the end of February.

The last tutorial I found is using Firebase Realtime Database. The data is aleady on Firestore so I can't change that. I appreciate your support and thank you in advance.

Also, it would be nice if you can help me to persist MobX state in localStorage.