1. Run shadow-cljs npx shadow-cljs -d nrepl/nrepl:1.0.0 -d cider/cider-nrepl:0.28.7 cljs-repl app
2. Open http://localhost:9630 in Firefox
3. Wait until Shadow-cljs finish building
4. Open http://localhost:8280 (the app) in Firefox
5. In Emacs, run cider-connect-cljs with host = localhost, port = 8777, type = shadow, build = app

Suggestions are welcomed.