Ionic 4 how do I receive componentProps? : <p>In Ionic 4, I am trying to use the <code>modalController</code> to open a modal.    I am able to open the modal and send <code>componentProps</code>, but I'm not sure how to receive those properties.</p>

<p>Here's how I open the modal component:</p>

<pre><code>async showUpsert() {
  this.modal = await this.modalController.create({
    component:UpsertComponent,
    componentProps: {test: "123"}
  });
  return await this.modal.present();
}
</code></pre>

<p>My question is; in the actual modal, how do I get <code>test: "123"</code> into a variable?</p>
