feathers client service + telegram promised bot service

index.html

<main class="container">
  <h2 class="center-text">Bot</h2>
  <script async src="https://telegram.org/js/telegram-widget.js?4" data-telegram-login="<Bot username terminated with 'bot'>" data-size="large" data-onauth="onTelegramAuth(user).then(function(res){console.log(res)})" data-request-access="write"></script>
  <footer>
</main> 
<script type="text/javascript">
  console.log("Loading feathers client...")
  var app = window.app = feathers();
  var rest = feathers.rest('http://<my registered bot domain that must not be you localhost machine but a DNS one>');
  app.configure(rest.fetch(window.fetch));
  console.log("done");
  function onRadar(user){
    console.log(user)
    let clone = {}
    let p = ['id', 'first_name', 'last_name', 'auth_date', 'hash']
    for(let i in p) {
      if (p[i] === 'id') {
        clone['telegramId'] = user[p[i]]
      } else {
        clone[p[i]] = user[p[i]]
      }
    }
    return app.service('users').create(clone)
  }
  function onTelegramAuth(user) {
    return onRadar(user)
  }
 </script>