Mini Chat App (Authentication)

I am back to the mini chat app now. I discovered that some of the test is not properly done. So, I modified and add authentication logic.

Firebase authentication is one of the way to authenticate people without writing your own authentication logic. I used to write Django app and I found that if I need to write it myself. I have to setup tons of things. So, I gave up. But, we have Firebase today. It is easier to do authentication, authorization, hosting, and storing data with it. I use Firebase authentication and realtime database in this project because they are only part I need to use.

Firebase integration with TypeScript is not really good. I found that some part of my app become any type. This behavior is undesired because it defeats type safety. I could use ReasonML if there is library that have concrete documentation and community.