Copy missing mails after migration using IMAP

imap-copy.js

var imaps=require('imap-simple');
 
var src,dst;
 
imaps.connect({
  imap: {
    user: '***********',
    password: '********',
    host: '***********',
    port: 993,
    tls: true,
    debug: function(msg) {
      console.log(msg)
    }
  }
})
.then(function(con){
  src=con;
  return src.openBox('INBOX');
})
 
.then(function(){
  return imaps.connect({
    imap: {
      user: '****************',
      password: '********',
      host: '***********',
      port: 993,
      tls: true,
      debug: function(msg) {
        console.log(msg)
      }
    }
  })
})
.then(function(con){
  dst=con;
  return dst.openBox('INBOX');
})
.then(function(){
  return src.search(['ALL', ['SINCE', 'July 27 2021'], ['BEFORE', 'October 10, 2021']],{
    headers: { parse: false },
    bodies: ''
  })
})
.then(function(results){
  function loop(){
    if (!results.length) {
      console.log('All done!');
      return;
    }
    var result=results.shift()
    var flags=[];
    if (result && result.attributes && result.attributes.flags) {
      console.log(result.attributes.flags);
      result.attributes.flags.filter(function(flag){
        return flag!='//Forwarded';
      });
    }
    dst.append(result.parts[0].body,{
      flags: flags,
      date: result.attributes.date
    })
    .then(function(){
      loop();
    })
    .catch(function(err){
      throw err;
    });
  }
  loop();
});