title: Ionic 4 how do I receive componentProps?
body: <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>