This program is derived from comint-mode and provides the following features.

 * Token completion, same as Node.js REPL
 * File name completion in string
 * Incremental history search
 * Sending JavaScript code to REPL


Put this file in your Emacs Lisp path (e.g. ~/.emacs.d/site-lisp)
and add the following line to your .emacs:

   (require 'nodejs-repl)

Type M-x nodejs-repl to run Node.js REPL.
See also `comint-mode' to check key bindings.

You can use `nodejs-repl-minor-mode' to send JavaScript code to REPL as
follows:

    (add-hook 'js-mode-hook #'nodejs-repl-minor-mode)

When a version manager such as nvm is used to run different versions
of Node.js, it is often desirable to start the REPL of the version
specified in the .nvmrc file per project.  In such case, customize the
`nodejs-repl-command` variable with a function symbol.  That function
should query nvm for the Node.js command to run.  For example:

    (require 'nodejs-repl)
    (defun nvm-which ()
      (let* ((shell (concat (getenv "SHELL") " -l -c 'nvm which'"))
             (output (shell-command-to-string shell)))
        (cadr (split-string output "[\n]+" t))))
    (setq nodejs-repl-command #'nvm-which)

The `nvm-which` function can be simpler, and perhaps can run faster,
too, if using Bash:

    (defun nvm-which ()
      (let ((output (shell-command-to-string "source ~/.nvm/nvm.sh; nvm which")))
        (cadr (split-string output "[\n]+" t))))