email-already-in-use-handlesubmit-example.js

export default function Register() {
const emailsAlreadyInUse = [];

function handleSubmit(values, { 
  setSubmitting,
  setFieldError
}) {
setTimeout(() => {
  if (values.email === 'teste123@teste.com') {
    setFieldError('email', 'email already registered');
    emailsAlreadyInUse.push(values.email);
    setSubmitting(false);
  } else {
    alert(JSON.stringify(values))
    setSubmitting(false);
  }
}, 100);
}