Managing sessions in a bot locally for NodeJS (wwebjs)

index.js

const { Client, LocalAuth } = require("whatsapp-web.js");
const Session = require("./context").default;
let ServerSession = new Session()




/** function to check if participant isAdmin
   * @param  {any} participants this is the array of participants from the group https://docs.wwebjs.dev/GroupChat.html#participants
   * @param  {any} senderContact this is the object of the msg.getContact() https://docs.wwebjs.dev/Message.html#getContact
   */
function isAdmin(participants, senderContact) {
  const foundParticipant = participants.find((participant) => {
    return senderContact.id.user.includes(participant.id.user);
  });
  return foundParticipant.isAdmin;
}

// instantiate client
const client = new Client()

// handle QR events and all others


client.on("message", async (msg) => {

  const chat = await msg.getChat();
  const sessionId = chat?.id._serialized.toString() //you can choose what ever you wish
  let currentSession;

  currentSession = _Session.getSession(sessionId)

  if (!currentSession) {
    // if session doesnt exist create new session
    const sessionObject = {
      message: "No Message",
//       you can add more objects here
    };

    _Session.setSession(sessionId, sessionObject);
     console.log("<<<<<<<<< Session Saved >>>>>>>>")
    currentSession = sessionObject
  }
  
  // saving data
  if (msg.body == "!save") {
    let newSessionData = { ...currentSession, message: "Hello data saved" }
    ServerSession.setSession(sessionId, newSessionData) //save data in session
  }
  
  // getting data
  if (msg.body == "!fetch") {
    if(isAdmin(chat.participants, msg.getContact())){
      let message = currentSession.message //access session data
      msg.reply(message)
    } else{
      msg.reply("Only Admins can fetch")
    }
  }
  
})

SessionContext.js

// You can create a new file like this
class Session {
//   this is just to make sure you are isolating data that pertains to multiple groups
  constructor() {
    this.sessions = {};
  }

  getSession(sessionId) {
    const _session = this.sessions[sessionId];
    console.log("Getting",sessionId, _session)
    return _session ? _session : null;
  }

  setSession(sessionId, userData) {
    if (this.sessions[sessionId]) {
      Object.assign(this.sessions[sessionId], userData);
      return;
    }
    this.sessions[sessionId] = userData;
  }
}

// take note 
exports.default = Session;