title: Inject dependency service to parent class in angular
body: <p>I have class <code>parent</code> and <code>child</code>. The <code>child</code> class extends <code>parent</code>. I need to <code>@Inject</code> injectable class <code>service</code> to <code>parent</code> because all <code>child</code>'s using it. How I can do it?</p>