FWIW, I just delivered a product (front-end in React+Typescript) using just that. I started writing a back-end in AzureFn+CosmosDb+some other stuff) and switche

FWIW, I just delivered a product (front-end in React+Typescript) using just that. I started writing a back-end in AzureFn+CosmosDb+some other stuff) and switched over to using Firebase for auth and the DB. The cool part is that because of the nature of the Firebase client APIs that emit change-notifications whether it be from local or remote changes, GFB acted as my state/store so I was able to get by w/o any React state mgmt frameworks (like Flux or Mobx, etc.) - though I also did so for expediency as I'm normally not a front-end dev so I wanted to ramp up on as little as possible. Though I'm still an Azure/.Net fan for back-end work, I appreciate that GFB provided only what I needed (at least for this app) but no more.