Trying to make these steps to make AngularJS 2.0 sample app running.
On that step, putting code in app.ts:
///
There is an option in IntelliJ where you can define a custom typescript version. Default is 1.4 but you can download 1.5 beta and assign that. The only problem with the sample I've seen is to activate 1.5 new argument to generate decorators metadata. IntelliJ always report that the TS process stopped.