Ionic 3 is focused on building both native/hybrid apps through Cordova, as well as adding the ability for Progressive Web Apps and Electron. 

Ionic 3 is now available on Sierra Servers in MacinCloud Managed Server Plans. You can simply run the Terminal App at Applications > Utilities > Terminal, and follow the Ionic 3 Tutorial to get started. Notice that you should skip the "installation" part as it is already installed on the MacinCloud Mac server.

Other resources:

Ionic Framework 3 Documentation Home Page

Migration Concepts