It doesn’t.

Someone suggested such functionality a while ago, but it was incomplete at the time.

The idea wasn’t bad, but it wasn’t implemented in terms of middleware https://github.com/clojure-emacs/cider/pull/2119

@vemv ^^

we don't have exactly this in cljr but we do have some functionality around generating stubs. may give ux hints. check out wiki pages for extract fn, promote fn and fn from example