Hiding server-side dependencies from Webpack

utilities.js

var jsdom; // populated later if contextIsBrowser fails

var utilities = {
  "domify":           function (node) {
                        if (!node["getElementsByTagName"]) {
                          node = jsdom(node);
                        }

                        return node;
                      },

  "contextIsBrowser": function () {
                        var getGlobalScope = function () {
                          return this;
                        };

                        return getGlobalScope().hasOwnProperty('window');
                      }
};

if (!utilities.contextIsBrowser()) {
  jsdom = require('jsdom').jsdom;
}

module.exports = utilities;

webpack_settings.js

//…

  "plugins":    [
                  new Webpack.IgnorePlugin(/jsdom/)
                ],

// …