How do I send draft mail using Node.js?

Question

How do I send a draft mail to draft folder using an API or via imap, SMTP?

mails.on("message", (message, seq) => {
    console.log('message',message);
    message.on("body", stream => {
        console.log("results123456--------",uid);
        let buffer = "";
        stream.on("data", chunk => (buffer += chunk.toString("utf8")));
        stream.once("end", () => mailBox.move(uid, "[Gmail]/Draft")); 
    });
});