Question: I want to eject expo to bare react native cli but i can't because I am not able to enter android package name when asked. Basically when i type any android package name and hit enter it just return a blank value again.Looks like cmd is not taking input. But i degraded to expo sdk 36 from 38, then it works fine as There are different options to eject.
[![enter image description here](https://i.stack.imgur.com/w0Jib.png)](https://i.stack.imgur.com/w0Jib.png)

Answer: 
i also had the same issue

Go to app.json in your react native project folder and add in

```
“ios”: { “bundleIdentifier”: “IOSName” },

“android”: { “package”: “AndroidName” }

```

and then save it and then go to your terminal and type ***expo eject***

When it asks for Android Package Name, give the name that you have given in your app.json file for android, and similarly for ios.

Then it should work fine and finish the expo eject command.
I ran into this issue as well and found out you can only use alphanumeric characters, '.' and '\_', and for some reason you have to have at least one `.` or `_` in there. So something like `My.App` worked for me