Supporting feature tests directly

Axel Rauschmayer axel at
Sun Mar 22 00:10:43 UTC 2015

I don’t think there are even documented best practices for ES6, yet (w.r.t. switching between native ES6 and transpiled ES6). That’d be interesting, too.

> On 21 Mar 2015, at 21:28, Kyle Simpson <getify at> wrote:
> Has there been any consideration or discussion for direct support of feature tests for ES7+ features/syntax? I'm thinking specifically of things which are difficult or impossible to just simply test for, like via the existence of some identifier.
> I have an idea of what that could look like, and am happy to discuss further here if appropriate. But I was just checking to see if there's any prior art around related specifically to JS to consider before I do?

Dr. Axel Rauschmayer
axel at

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