I’m adding myself to this. Everything stopped working since yesterday morning. Not sure if it is related to any of the dependency getting upgraded like node. But “build”, “run”, “emulate” none of those are working and no errors are thrown. “serve” still works.
I was able to resolve the issue. In my case it was the latest version of node v5.0.0. I installed a previous version via nvm https://github.com/creationix/nvm and everything is back to normal with Ionic cli.
In ArchLinux I solved by going to http://ala.seblu.net/packages/ and downloading ‘icu’ version 55 and ‘nodejs’ version 4.2. Then in the console you must run “sudo pacman -U the downloaded package” for each package.