Noticed when experimentally upgrading my ng 4 (angular-cli) project to ng 5 (beta 6) there was a codelyzer warning that it only supports < 5.0.0
I've run ng test and ng build without any problems, other than a build warning (although I didn't do code coverage, or ng build --prod for that matter)
Just one to put on the work path so when ng 5 goes live we don't get warnings.