Tabs template. Where's the 'ionic' folder?

Hi there!

I am learning Ionic 2 and trying to play around with the Tabs template.
I need to import Page and Platform modules which are to be located in Ionic folder

Import { Page, Platform } from ‘ionic/ionic’;

But I can’t find the Ionic folder among the folders in the Tabs template.
So how do I import these modules into my project?