title: How to subscribe to changes Knockout Observable in TypeScript?
body: <p>How to subscribe to changes Knockout Observable in TypeScript?</p>
  
  <pre><code>Data :Knockoutobservable&lt;string&gt; = ko.Observable&lt;string&gt;();
  </code></pre>
  
  <p>I need something like:</p>
  
  <pre><code>Data.subscribe(function(e){})??
  </code></pre>