I’m running lots of Angular 2 using the CLI on OSX (and loving it).
I have one small issue…
Often after stopping the app, when re-running it I get
‘Port 4200 is already in use.’
Here is a little linux magic for you:
lsof -t -i tcp:4200 | xargs kill -9 | ng serve
This will find the process using port 4200, kill it, then re-serve your application.
(Posted for my FireBootCamp students that are having this issue.)