title: How Deeplinks in Ionic 4 works?
body: <p>I'm trying to using deep links in ionic 4 but unable to find success.</p>
  
  <p>In app.component.ts:
  <strong>@ViewChild(IonNav) nav: IonNav;</strong></p>
  
  <pre><code>        this.deeplinks.routeWithNavController(this.nav, {
              '/auth/password/reset/:authToken': 'ForgotPasswordPage'
          })
              .subscribe((match) =&gt; {
              }, (nomatch) =&gt; {
              });
  </code></pre>
  
  <p>In forgot-password.page.ts</p>
  
  <pre><code>this.authToken=this.route.snapshot.paramMap.get('authToken')
  </code></pre>
  
  <p>But when i click the link it opens the app but not the ForgotPassword Page and giving this error : <strong>Cannot read property 'push' of undefined</strong></p>