I’m using node imap :

https://www.npmjs.com/package/node-imap

i have this method to save message as draft

 imap.once('ready', () => {
      imap.openBox('Drafts', false, (err, box) => {
        if (err) throw err;
        let msg, htmlEntity, plainEntity;
        msg = mimemessage.factory({
          contentType: 'multipart/alternate',
          body: []
        });
        htmlEntity = mimemessage.factory({
          contentType: 'text/html;charset=utf-8',
          body: 'Draft Mail'
        });
        plainEntity = mimemessage.factory({
          body: 'Draft Mail'
        });
        msg.header('Message-ID', '<msgId>');
        msg.header('To','[email protected]');
        msg.header('Subject', 'Mail');
        msg.body.push(plainEntity);
        imap.append(msg.toString());
      })
    });

I want to add attachment also in this mail and save this as a draft, any solution thanks