gistfile1.txt

class Model {
  constructor(string) {
    this.id = 20;
    this.name = string;
  }
}


module.exports = Model;

gistfile2.txt

(django-dropoff)Rollos-Mac-Pro:backbone-playground Rollo$ iojs --use_strict --harmony_classes ./node_modules/.bin/mocha
/Users/Rollo/Developer/backbone-playground/src/lib/Model.js:1
(function (exports, require, module, __filename, __dirname) { class Model {
                                                              ^^^^^
SyntaxError: Unexpected reserved word
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:393:25)
    at Object.Module._extensions..js (module.js:428:10)
    at Module.load (module.js:335:32)
    at Function.Module._load (module.js:290:12)
    at Module.require (module.js:345:17)
    at require (module.js:364:17)
    at Object.<anonymous> (/Users/Rollo/Developer/backbone-playground/test/test.js:3:13)
    at Module._compile (module.js:410:26)
    at Object.Module._extensions..js (module.js:428:10)
    at Module.load (module.js:335:32)
    at Function.Module._load (module.js:290:12)
    at Module.require (module.js:345:17)
    at require (module.js:364:17)
    at /Users/Rollo/Developer/backbone-playground/node_modules/mocha/lib/mocha.js:192:27
    at Array.forEach (native)
    at Mocha.loadFiles (/Users/Rollo/Developer/backbone-playground/node_modules/mocha/lib/mocha.js:189:14)
    at Mocha.run (/Users/Rollo/Developer/backbone-playground/node_modules/mocha/lib/mocha.js:422:31)
    at Object.<anonymous> (/Users/Rollo/Developer/backbone-playground/node_modules/mocha/bin/_mocha:398:16)
    at Module._compile (module.js:410:26)
    at Object.Module._extensions..js (module.js:428:10)
    at Module.load (module.js:335:32)
    at Function.Module._load (module.js:290:12)
    at Function.Module.runMain (module.js:451:10)
    at startup (node.js:124:18)
    at node.js:882:3