This package was extracted and refactored from doom-emacs, Thanks hlissner’s work!

Clone this repo and put it under your load-path. Then add this snippet in your emacs.d.

(with-eval-after-load 'elisp-mode
  (require 'elispfl)
  (elispfl-mode))

With this, enable font-lock in your ielm

(with-eval-after-load  'ielm
  (require 'elispfl)
  (elispfl-ielm-mode))