classes and enumerability

Rick Waldron waldron.rick at
Wed Dec 24 13:56:51 PST 2014

On Wed Dec 24 2014 at 4:49:36 PM Kevin Smith <zenparsing at> wrote:

> Here is the summary:
>> Total Files Read:  11038
>> Files Containing Explicit 'enumerable: false':  149
>> Occurrences of 'enumerable: false' (and variants): 206
> I love this kind of analysis - thanks!

I was actually inspired by a similar report you created for the list in the

> My interpretation of this data is that non-enumerability isn't important
> enough to bother with in the vast majority of cases.

Yes, this was my interpretation as well.

> It *may* still be that non-enumerability is the least-surprise option for
> class methods, but certainly users don't care enough about the issue
> currently to bother with typing in "enumerable: false".
> I'm still concerned about the refactoring hazard argument.  I think the
> idea is that if I change some ES5-style class into an ES6-style class, then
> I need to have good unit tests already in place to make sure that
> non-enumerability won't break things.  Otherwise, I can't do the refactor.

Agreed: this has also been my main argument when the subject has come up in
the past.

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