How to catch any Javascript exception in Clojurescript?

Question

In my communication layer I have a need to be able to catch ANY javascript exception, log it down and proceed as I normally would do. Current syntax for catching exceptions in C

Answer 1

It looks like js/Object catches them all (tested on https://himera.herokuapp.com):

cljs.user> (try (throw (js/Error. "some error")) (catch js/Object e (str "Caught: " e)))
"Caught: Error: some error"
cljs.user> (try (throw "string error") (catch js/Object e (str "Caught: " e)))
"Caught: string error"
cljs.user> (try (js/eval "throw 'js error';") (catch js/Object e (str "Caught: " e)))
"Caught: js error"

One thing to watch out for is lazy sequences. If an error is thrown in a lazy sequence that part of the code might not be executed until after you've exited the try function. For example:

cljs.user> (try (map #(if (zero? %) (throw "some error")) [1]))
(nil)
cljs.user> (try (map #(if (zero? %) (throw "some error")) [0]))
; script fails with "Uncaught some error"

In that last case, map creates a lazy sequence and the try function returns it. Then, when the repl tries to print the sequence to the console, it's evaluated and the error gets thrown outside of the try expression.