Interface for dynamic key in typescript : <p>I have an Object like this that is created by underscore's <code>_.groupBy()</code> method.</p>

<pre><code>myObject = {
  "key" : [{Object},{Object2},{Object3}],
  "key2" : [{Object4},{Object5},{Object6}],
  ...
}
</code></pre>

<p>How would I define that as an Interface with TypeScript?
i don't want to simply define it as <code>myObject:Object = { ...</code> but rather have an own type for it.</p>
