use getters on JSError
use getters on JSError

closure made all fields private

https://github.com/google/closure-compiler/commit/52010f41b7b5de46ba8f4cf2d4a8185044285159

thheller/shadow-cljs,thheller/shadow-devtools,thheller/shadow-cljs,thheller/shadow-cljs,thheller/shadow-devtools,thheller/shadow-devtools,thheller/shadow-devtools,thheller/shadow-cljs