TAB or M-tab

code completion (enable company-mode first)

M-x cider-repl-history

C-c C-m

Open a macro expansion buffer

C-c M-t v

trace function evaluation

M-x cider-classpath

see your dependencies

M-x cider-browse-ns

M-x cider-browse-spec

browse the Clojure specs registry

There is cider-stacktrace-mode with various extra navigation commands.

There are lots of ways to run tests.

There is a debugger, and it is good.

cider-enlighten-mode lets you see locals in real-time

Cider can work with ClojureScript and Figwheel.

You need:

• piggieback
• figwheel-sidecar

Then you need to do some Emacs config:

(setq cider-cljs-lein-repl
      "(do (use 'figwheel-sidecar.repl-api) (start-figwheel!) (cljs-repl))")