function get_beautify(js_beautify, css_beautify, html_beautify) {
  // the default is js
  var beautify = function(src, config) {
    return js_beautify.js_beautify(src, config);
  };

  // short aliases
  beautify.js = js_beautify.js_beautify;
  beautify.css = css_beautify.css_beautify;
  beautify.html = html_beautify.html_beautify;

  // legacy aliases
  beautify.js_beautify = js_beautify.js_beautify;
  beautify.css_beautify = css_beautify.css_beautify;
  beautify.html_beautify = html_beautify.html_beautify;

  return beautify;
}
The following batches are equivalent:

var beautify_js = require('js-beautify');
var beautify_js = require('js-beautify').js;
var beautify_js = require('js-beautify').js_beautify;

var beautify_css = require('js-beautify').css;
var beautify_css = require('js-beautify').css_beautify;

var beautify_html = require('js-beautify').html;
var beautify_html = require('js-beautify').html_beautify;

All methods returned accept two arguments, the source string and an options object.