Validate input as email or phone, with errors

email-or-phone-validation.js

let contact = 'test', data, error;
const first = contact.substring(0, 1)
if (first === '+' || first === '(' || !isNaN(first)) {
  //phone
  console.log('testing phone')
  const phone = contact.replace(/[+|-|(|)|.| ]/g, "").toLowerCase()
  if (phone === "" || isNaN(phone)) {
    error = "Please enter a proper phone number.";
  } else if (phone.length < 10) {
    error = "Your phone number is not long enough. Please include the Area Code.";
  } else {
    data = phone
  }
} else {
  //email
  console.log('testing email')
  const isEmail = /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/.test(contact)
  if (!isEmail) error = "Please enter a proper email address."
  else data = contact
}
console.log(error)