Status/Thoughts on Guards?

Mark S. Miller erights at
Tue Aug 19 19:52:21 PDT 2014

See also

I am a fan of making it notationally easier to inject runtime validation of
some sort, whether starting from guards or from either of the approaches

>From discussions at TC39, it is clear that any such proposal would be a
long fight. I don't know that anyone is willing to invest the time needed
to lead that fight. I know I'm not -- it is unlikely to bubble to the top
of my priority queue.

On Tue, Aug 19, 2014 at 7:00 PM, Curtis Steckel <steckel at>

> I've been spending time lately writing a lot of repeated validation code
> for function parameters and using popular object schema validation
> libraries like Joi ( which led me to
> re-reading and thinking about strawman:guards (
> **I'm curious what TC39 and the es-discuss' current thoughts and attitudes
> towards guards is at the moment.**
> They seem to come up every once in a while in TC39 notes, but usually only
> through a tangential mention followed by a mix of "that would eliminate the
> possibility of guards," "guards could work," "let's talk about something
> else (not guards)."
> I see that Dave Herman seems to have some opinions on guards and obviously
> Waldemar has ideas (given his activity on the straw man). Anyone else?
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