title: How to extend object in gulp without installing npm
body: <p>How to extend object in gulp without installing npm?</p>
  
  <pre><code>var a = {a: 1};
  var b = {b: 2};
  var c = extend({}, a, b, {c:3});
  
  c is {a: 1, b: 2, c: 3}
  </code></pre>