title: How to push data to an array who is a key of a object in Typescript?
body: <p>I have a Object like this:</p>
  <pre><code> let myObject = {key:[]};
  </code></pre>
  <hr />
  <p>And I try to push some data to the key in the myObject:</p>
  <pre><code>myObject.key.push({name:'Mostafa',family:'Saadatnia'});
  </code></pre>
  <p>What is the typescripts error tells me is:</p>
  <blockquote>
  <p>Type 'any' is not assignable to type 'never'.ts(2322)</p>
  </blockquote>
  <p>How can I fix that? I don't want to fill data on definition-time. All of I need is fill that in the runtime</p>