Here is my first simple Hello World
angular 2 app from Angular 2 quick start guide.
import {Component} from \'angular2/core\';
import {bootstrap} fr
IMO changing the code all over just so that WebStorm / IntelliJ will not complain is not a viable solution. Since I have a separate bundling / compiling process I instead disabled IntelliJ's ops on typescript: Settings->Languages->Typescript - uncheck the options there. If that is already the case for you than you can try checking the options, applying and then unchecking again.
You can see this is still a bit buggy. For example after I have done some class renaming using the IDE (SHIFT + F6) the errors returned. Repeating the above removed them again.
Using IntelliJ 15.0.2