Socketon

npm install socketon

const { makeWASocket, useMultiFileAuthState, DisconnectReason } = require('socketon');
const pino = require('pino');

async function start() {
    const { state, saveCreds } = await useMultiFileAuthState('./auth');
    
    const sock = makeWASocket({
        logger: pino({ level: 'silent' }),
        auth: state,
        printQRInTerminal: true
    });

    sock.ev.on('connection.update', async (update) => {
        const { connection, lastDisconnect } = update;
        if (connection === 'close') {
            const shouldReconnect = lastDisconnect?.error?.output?.statusCode !== DisconnectReason.loggedOut;
            if (shouldReconnect) start();
        } else if (connection === 'open') {
            console.log('Connected to WhatsApp!');
        }
    });

    sock.ev.on('messages.upsert', async ({ messages }) => {
        const msg = messages[0];
        if (!msg.key.fromMe && msg.message) {
            console.log('Received message:', msg);
        }
    });

    sock.ev.on('creds.update', saveCreds);
}

start();