ob-javascript

support node and headless chrome
support requiring npm modules from node_modules
support session as well as one shoot evaluation
babel support
wait for promises to resolve
no need to return
avoid using let or const

Install

(use-package ob-javascript
  :straight (:host github
             :flavor nil
             :repo "KarimAziev/ob-javascript"
             :files ("ob-javascript.el" ".babelrc" "*.js" "node_modules")
             :pre-build (("make" "build")))
  :init
  (setq-default org-babel-default-header-args:javascript '((:babel . "yes"))))

supported header arguments

session
file
babel
dir

examples

no return needed

#+BEGIN_SRC javascript
new Date
#+END_SRC

#+RESULTS:
: 2016-11-26T05:23:47.867Z

promise support

if the code block yields a promise, it will be inspected after resolution, the default timeout is 5 seconds

#+BEGIN_SRC javascript :dir ~/local_babel/
fetch = require('node-fetch')

fetch('https://api.github.com/repos/zweifisch/ob-coffee/languages')
  .then(res => res.json())
#+END_SRC

#+RESULTS:
: { 'Emacs Lisp': 4069, JavaScript: 184 }

babel

Options for babel can be customized with ob-javascript-babel-options.

Plugins and presets used in options should exists in ob-javascript-babel-node-modules-path.

#+BEGIN_SRC javascript :babel yes :dir ~/local_babel/
import fetch from 'node-fetch'

(async () => {
  let res = await fetch('https://api.github.com/repos/zweifisch/ob-javascript/languages')
  return res.json()
})()
#+END_SRC

#+RESULTS:
: { 'Emacs Lisp': 3993, JavaScript: 864 }

dir

Directory context to evalute code within it.

#+begin_src javascript :babel yes :dir ~/local_babel/
import * as R from "ramda";

R.compose(Math.abs, R.add(1), R.multiply(2))(-4)
#+end_src

#+RESULTS:
7

file

if the code block yields buffer or stream, and :file is specified, the result will be written to disk

#+BEGIN_SRC javascript :file canvas.png :dir ~/local_babel/
Canvas = require('canvas')
canvas = new Canvas(100, 100)
ctx = canvas.getContext('2d')

ctx.arc(50, 50, 50, -Math.PI * 0.5, Math.PI, false)
ctx.fillStyle = '#0ff'
ctx.fill()

canvas.toBuffer()
#+END_SRC

#+RESULTS:

headless chrome

#+BEGIN_SRC javascript :session http://gnu.org
document.querySelector('title').text
#+END_SRC

#+RESULTS:
: The GNU Operating System and the Free Software Movement

KarimAziev / ob-javascript