On Tuesday, April 12, 2016 at 9:21:44 PM UTC-7, Mike Fikes wrote: > Planck essentially takes advantage of this to print warning messages in a > different color, so it definitely: > > > > cljs.user=> (+ n 5) > WARNING: Use of undeclared Var cljs.user/n at line 1 > NaN > > So, yeah, that works. The problem is that you might have other things going > out the err stream. > > > > cljs.user=> (binding [*print-fn* *print-err-fn*] > #_=> (println "Danger, Will Robinson!")) > Danger, Will Robinson! > nil > > > Hooking into the custom warning handler machinery via *cljs-warning-handlers* > might be a cleaner route, if you need finer-grained control of things. (I’m > presuming this mechanism would work in self-host, but I’ve never tried it.) > > > (Jake McCrary has a good exposition on the subject: > http://jakemccrary.com/blog/2015/12/19/clojurescript-treat-warnings-as-errors/). >
Thanks; I'll investigate this further. > > - Mike > > > > On Apr 12, 2016, at 9:41 PM, J David Eisenberg <jdavid.e...@gmail.com> wrote: > > > If I evaluate this expression without defining a variable n: > > (+ n 5) > > I get this in my console.log: > > WARNING: Use of undeclared Var cljs.user/n at line 1 > > and the result is NaN. > > I would like to capture the warning message so I can show it to the end user. > When I take out (enable-console-print!) I get this message: > > Error: No *print-err-fn* fn set for evaluation environment > > so I presume I should be able to put in my own *print-err-fn* to intercept > the warning message. Am I on the right track? > [snip] -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at https://groups.google.com/group/clojurescript.
