title: Why is $ not recognised in angular 2?
body: <p>I have included this in my typings.json file:</p>
  
  <pre><code>    {
    "ambientDependencies": {
      "es6-shim": "registry:dt/es6-shim#0.31.2+20160317120654",
      "systemjs": "registry:dt/systemjs#0.18.4+20160417155658",
      "jquery": "github:DefinitelyTyped/DefinitelyTyped/jquery/jquery.d.ts#661fc869669af796c6048483e999dce5732eed72"
    }
  }
  </code></pre>
  
  <p>and the structure looks like this :</p>
  
  <p><a href="https://i.stack.imgur.com/qlT3B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qlT3B.png" alt="enter image description here"></a></p>
  
  <p>But I'll get the error that $ is not defined</p>