title: Get array of string literal type values
body: <p>I need to get a full list of all possible values for a string literal.</p>
  
  <pre><code>type YesNo = "Yes" | "No";
  let arrayOfYesNo : Array&lt;string&gt; = someMagicFunction(YesNo); //["Yes", "No"]
  </code></pre>
  
  <p>Is there any way of achiving this?</p>