fetchSignInMethodsForEmail method
Gets the list of possible sign in methods for the given email address.
This is useful to differentiate methods of sign-in for the same provider, eg. EmailAuthProvider which has 2 methods of sign-in, email/password and email/link.
Implementation
Future<List<String>> fetchSignInMethodsForEmail(String email) =>
handleThenable(jsObject.fetchSignInMethodsForEmail(email))
.then((list) => List<String>.from(list));