const cpfMask = (cpf) => { 
  
  if (/[a-zA-Z]|\W/.test(cpf)) {
    return cpf.replace(/[a-zA-Z]|\W/, "");
  }

  return cpf.replace(/^([0-9]{3})\.?([0-9]{3})\.?([0-9]{3})\-?([0-9]{2})$/, "$1.$2.$3-$4"); 

  
}