polybius.fyi/reveal.js/node_modules/underscore.string/slugify.js

var trim = require('./trim');
var dasherize = require('./dasherize');
var cleanDiacritics = require("./cleanDiacritics");

module.exports = function slugify(str) {
  return trim(dasherize(cleanDiacritics(str).replace(/[^\w\s-]/g, '-').toLowerCase()), '-');
};