how to send verification mail in firebase and forgot password link in firebase flutter version

fire base is providing the option to reset the password of the user this query will send a url for reseting the password to user mail id

var auth = firebase.auth();
var emailAddress = "<Mail_id >";

auth.sendPasswordResetEmail(emailAddress).then(function() {
  // Email sent.
    console.log("welcome")
}).catch(function(error) {
  // An error happened.
});

The method is available in the FirebaseUser, not FirebaseAuth (_auth).

await _auth.createUserWithEmailAndPassword(
  email: _userEmail,
  password: _userPassword
).then((FirebaseUser user) {
  // upon success, send email verification
  user.sendEmailVerification();  
  ...
})
.catchError(...);

Looking at current master, I don't think it is implemented yet. Perhaps file a feature request in flutter issue tracker?