I have defined a macro in a .cljc file:
(defmacro ->map
"(->map a b) ;;=> {:a a :b b}"
[& symbols]
(assert (every? symbol? symbols))
`(hash-map
~@(interleave (map keyword symbols) symbols)))
Sometimes (but not always) I would see an error in the browser logs:
router.cljc:203 Uncaught Error: Assert failed: (every? symbol? symbols)
at Function.dre.coll.__GT_map.cljs$core$IFn$_invoke$arity$variadic (coll.cljc:563)
at dre$coll$__GT_map (coll.cljc:560)
at events.cljs:64
Why is a compile time macro ending up as a run time function in the target JS? Quite a surprise. After a discussion on Slack this turned out to be related to self-hosted ClojureScript. The conversation in Slack is recorded in the attachment slack.txt.
The library
https://github.com/cgrand/macrovich turned out to have the solution for me.
It would be helpful if the compiler did not generate a run-time function from a macro in non-self hosted mode, or at least emit a warning.
