With only the code:
Clojurescript 1.9.946 with advanced optimizations generates a js file with 4640 bytes.
Clojurescript 1.10.217 with advanced optimizations generates a js file with 92409 bytes.
Build 1.9.946 with: lein cljsbuild once min
Build 1.10.217 either by updating the project.clj file, or with:
Linux (nixos) & macosx, Java 9.0.4, Clojure 1.9
Minimal repro (without lein cljsbuild):
deps.edn
src/cljsbug/core.cljs
release.clj
Change deps.edn to to depend on 1.10.217:
deps.edn
This is a consequence of two things.
The code pulled in by call (maybe-enable-print!) at the bottom of cljs.core.
The use of ex-info instead of js/Error in the default eval value implementation.