exports.deleteNewUser = functions.auth.user().onCreate((userRecord, context) => {
  const uid = userRecord.uid; // The Firebase user.
  admin.auth().deleteUser(uid)
    .then(function() {
      console.log("Successfully deleted user: " + uid);
    })
    .catch(function(error) {
      console.log("Error deleting user:", error);
    });
});