Create JS starter project with ionic 2 start command

AFAIK JavaScript is not supported by the CLI anymore, here’s the official comment about it:

JS option has been removed, since we are going to focus our efforts to support Typescript.

Since TS is a superset of JS, it is up to developers to use the new features or not.

We strongly recommend to give TS a try, decorators and types help a lot while using angular 2.

You might need to install typings and the required type definitions to get rid of the error messages.

If there are no type definitions for some libraries then you could use ambient declarations: