title: Is it possible for Firebase Auth to validate email and password without creating a new user?
body: <p><code>firebase.createUserWithEmailAndPassword(email, password)</code> also validates the <code>email</code> &amp; <code>password</code> and returns an error if the email format is invalid, or if it already exists, or if the password is invalid, etc.</p>
  
  <p>However, Firebase doesn't seem to have a function that does only the validation. If the email and password are valid, it directly creates a new user.</p>
  
  <p>Is there any way Firebase can be used to do validation? I did write code for it, but it is not only redundant, I also cannot determine if an email already exists without using Firebase.</p>