Some more shadow-cljs REPL guidance

.dir-locals.el

((nil . ((clojure-directory-prefixes . ("\\`clj[scx]?\\."
                                        "\\`bb\\."))
         (cider-preferred-build-tool . clojure-cli)
         (cider-clojure-cli-global-options . "-A:dev:test:backend:frontend")
         (cider-default-cljs-repl . custom)
         (cider-custom-cljs-repl-init-form . "(do (user/cljs-repl))")
         (eval . (progn
                   (make-variable-buffer-local 'cider-jack-in-nrepl-middlewares)
                   (add-to-list 'cider-jack-in-nrepl-middlewares "shadow.cljs.devtools.server.nrepl/middleware"))))))

user.clj

(ns user
  (:require [shadow.cljs.devtools.api :as shadow]
            [shadow.cljs.devtools.server :as server]))

(defn cljs-repl
  ([]
   (cljs-repl :app))
  ([build-id]
   (server/start!)
   (shadow/watch build-id)
   (shadow/nrepl-select build-id)))

I'm using this approach with cider-jack-in-clj&cljs to establish sane cider REPL sessions for some projects and it seems to work well, with sesman reporting [*cider-repl %s(cljs:custom)*, *cider-repl %s(clj)*] upon jack-in.