Can't save the return value of setTimeout() in the session of MS bot framework

I am programming a FacebookBot with Node.js using the MS bot framework.

I am programming a process to send a message after a certain period of time, but I am in trouble because I can not save the return value of setTimeout() in session.

This is my code.

   var timeout = setTimeout(() => {
       // run function
   }, 10000);

   session.dialogData.timeout = timeout;
   builder.Prompts.text(session, 'text');

Somebody have a good idea?

Thank you helping.

via nkhrk