title: Firebase - How to detect/observe when Firebase user verified their email like onAuthStateChanged
body: <p>I understand that to check if the user's email is verified, I can use </p>
  
  <pre><code>firebase.auth().onAuthStateChanged((user) =&gt; {
      console.log(user["emailVerified"]);
  })
  </code></pre>
  
  <p>However my problem is, I want to observe/listen and redirect to another page whenever the user verified their email address on their inbox. </p>
  
  <p>Based on my testing, onAuthStateChanged is triggered when user logged in, updated their profile, and logged out, but is not triggered when the user verified their email address on their inbox. </p>
  
  <p>Is there anyway I can detect when the user is verified and automatically redirect to another page?</p>