I understood as NodeJS is a run time environment. Ionic Framework is independent of NodeJS environment?
Ionic only uses NodeJS for development tooling (e.g, the “gulp” build tool and the Ionic CLI are a NodeJS programs). But an Ionic app running on a device (phone/tablet) doesn’t use or depend on NodeJS.
like leop said - the framework itself is only one part if ionic and only requires AngularJS. The cli is a tool to combine most parts of the ionic universe and is based on nodejs (like cordova-cli).