mobx

This needs to be done for:

• mobx
• flutter_mobx
• mobx_codegen

I would love to have native examples of all the state systems in https://snack.expo.io/

This is a bit of a haul, help needed.

I use the MacOS system,but I don't know how to do it,could you give me a user's guide？

What's going on?
After upgrading to react-navigation v5 it is not possible to generate a navigator. The generator script should be removed since it doesn't to anything.

Reference: https://infiniteredcommunity.slack.com/archives/C41PK1LAY/p1597912523006200

Steps to r