What's going on?
Command failed: yarn add ignite-bowser --dev
~ ❯❯❯ node -v
v10.14.1
~ ❯❯❯ react-native -v
react-native-cli: 2.0.1
react-native: n/a - not inside a React Native project directory
~ ❯❯❯ ignite -v
2.2.2

Steps to reproduce
ignite doctor results:

Hi @raooll , it looks like you have the command line tools installed but not Xcode. Can you confirm this?
@jamonholmgren yes I have only installed command line tool. Is the missing xcode causing the problem ?
Hey @jamonholmgren, I installed the latest xcode and I still get the same error.
I also had a problem like this, a solution was to open Xcode and set the Command Line Tools:

Restart the machine and try it again.
Hello @diegotejadav, the command line tools is set in my Xcode, still the same error.

Restarting the machine did not help either.
Weird. I'm not entirely sure what's going on there. My machine is completing the steps properly. Are you getting a new error or the same one?
@raooll Can you try creating a new react native bare app, like this:
react-native init Test
cd Test
and then add ignite-bowser, like this:
yarn add ignite-bowser --dev
Does that complete?
@jamonholmgren tried the above, it worked without any problem.

Sorry for the miss communication "yarn add ignite-bowser --dev" did complete, but ignite new is still failing. @jamonholmgren .
Same issue
ignite new is failing!
UPDATE
After installing xcode 10.1 its working.
After the app was generated running it via iOS sim 12.1 it shows this screen

I am trying the fixes as per https://stackoverflow.com/questions/52262084/syntax-error-support-for-the-experimental-syntax-decorators-legacy-isnt-cur
will let you know
Found another similar issue:
I think the comments under this issue are mostly unrelated, so I'm going to close and lock this, and if you can create new issues we'll take a look!
Most helpful comment
@jamonholmgren tried the above, it worked without any problem.
Sorry for the miss communication "yarn add ignite-bowser --dev" did complete, but ignite new is still failing. @jamonholmgren .