codigo app.component.html do artigo 11 do medium.

app.component.html

<div class="container-fluid">
  <div class="container">
    <div class="row">
      <div class="col">
        <div class="jumbotron">
          <h3 class="text-center">Angular com delay</h3>
        </div>
      </div>
    </div>
    <div class="row">
      <div class="col text-center">
        <button class="btn btn-info btn-lg" (click)="btnOnClick()">Clique com Delay</button>
      </div>
    </div>
  </div>
</div>