Emacs setup

simple configuration

• C-u M-x cider-jack-in-clj
• append ":dev" to end of the command string like "-M:cider/nrepl:dev"

alternate configuration

Create .dir-locals.el

((nil
  (cider-clojure-cli-global-options . "-A:dev")
  (cider-jack-in-nrepl-middlewares . ("cider.nrepl/cider-middleware" "shadow.cljs.devtools.server.nrepl/middleware")))) 

• .dir-locals.el has some project-specific config. When you first open a Clojure file, you'll be prompted to allow that config to be applied. Answer y.
• Then, to jack in: M-x sesman-start; Choose cider-jack-in-clj; "Your Clojure REPL is connected"
• Starting a CLJS REPL:
• Start a CLJS build from the Clojure REPL (user/main)
• M-x cider-connect-sibling-cljs
• Select shadow and the name of the shadow build :devkit
• http://localhost:8080 ; "Your ClojureScript REPL is connected!"

When inside of a CLJC file, evaluations will be sent to both REPLs. So be sure to wrap anything platform specific in reader conditionals before evaluating them. Inline results only show a single result, so whichever REPL returns slower wins. prn is your friend if you want to see evaluation results, as it will print in each REPL buffer the result from that environment.

To prevent being prompted to apply the local variables on every file you open:

• Run M-x customize and search for safe-local-variable-values
• Add a new entry for cider-jack-in-nrepl-middlewares, with the value that is in .dir-locals.el. E.g. ("cider.nrepl/cider-middleware" "shadow.cljs.devtools.server.nrepl/middleware")
• Apply and save in the customize buffer