Use the new react-is package for internal introspection

[aweary]

There is now an official package for introspection called react-is as of facebook/react#12199. We should use this in the React 16 adapter instead of manually copying over the element type constants.

[ljharb]

Is it incompatible with older reacts? it'd be great to use it in all the adapters.

[aweary]

I think it should be backwards compatible, I don't see why not!

[ljharb]

@aweary looks like it might not be compatible with react 0.13 :-/ https://travis-ci.org/airbnb/enzyme/jobs/396931952

I'll use it on the other adapters for now tho.