Unintuitive behaviour of cider-connect-sibling

[yuhan0]

Expected behavior

When I'm in a cljs buffer in a project with only a clj repl, I expect to be able to M-x cider-connect-sibling-cljs to start up a clojurescript repl within the same session.
Mental model: "Connect this buffer to existing ones"

Actual behavior

An error message is produced

No cljs REPLs in current session "..."

It seems that I have to navigate to a clj file in order to execute cider-connect-sibling-cljs, which seems quite unintuitive.
Mental model: "Connect other repl to this live buffer"

The reverse situation is also true - with a cljs repl in the session, I cannot cider-connect-sibling-clj from a clj file

Steps to reproduce the problem

src/
  foo.clj
  bar.cljs

• Navigate to bar.cljs
  M-x cider-connect-clj
  M-x cider-connect-sibling-cljs

• Error message is produced.

• Navigate to foo.clj, or M-x clojure-mode to trick Cider to thinking we're in a clj file.
  M-x cider-connect-sibling-cljs

• cljs repl is successfully connected

Environment & Version information

CIDER version information

;; CIDER 1.1.0 (Plovdiv), nREPL 0.7.0
;; Clojure 1.10.1, Java 13.0.2

Emacs version

28.0.50

Operating system

macOS 11.2.1

[bbatsov]

That's definitely a bug. PRs welcome!