title: `SyntaxError: Unexpected token ...` when trying to `require`
body: <p>I feel like I'm doing something really dumb here but I don't have a second set of eyes handy.</p>
  
  <pre><code>describe('app.backend.src.server', () =&gt; {
    const proxyquire = require('proxyquire');
    const mach = require('mach.js'); // &lt;- this is giving the error
  
    it('should pass to make sure Im not crazy', () =&gt; {
      expect(true).toBe(true);
    });
  });
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>Failures: 
  1) app.backend.src.server encountered a declaration exception
  1.1) SyntaxError: Unexpected token ...
  </code></pre>
  
  <p>package.json</p>
  
  <pre><code>  ...
    "devDependencies": {
      "gulp": "^3.9.1",
      "gulp-istanbul": "^1.1.1",
      "gulp-jasmine": "^2.4.2",
      "gulp-jshint": "^2.0.4",
      "gulp-tap": "^0.1.3",
      "jshint": "^2.9.4",
      "mach.js": "^0.5.0",
      "proxyquire": "^1.7.11",
      "run-sequence": "^1.2.2"
    }
    ...
  </code></pre>
  
  <p>Any suggestions?</p>