Example of a universal Emacs Package script

foo.el

#!/usr/bin/env emacs --script
;;; foo.el --- Foo development and productivity utils  -*- lexical-binding: t; -*-

;;;;; Commands

;;;###autoload
(defun bar ()
  "Print foo bar."
  (interactive)
  (message "Foo Bar!"))

;;;; CLI

(defun foo-running-as-script-p ()
  "Return truthy if running as Elisp script."
  (member "-scriptload" command-line-args))

(defun main ()
  "Entrypoint for foo"
  (pprint command-line-args-left)
  (message "Do stuff here"))
  
(when (foo-running-as-script-p)
  (main))

(provide 'foo)