I have freshly installed angular-cli 1.0.0.beta.17 (latest one), start new project, able to serve project on port 4200 with no problems - just standard \"app works!\" message.>
These are uglify js warnings either from your java-script source code or from the third party libraries you are using in your project.For now you can ignore them.
Angular cli team is working on suppressing this for the prod build
https://github.com/angular/angular-cli/pull/1609