Telegram bot exmaple

telegrambot.js

// This is a Telegram Bot that get's message command from group that have this bot. For this example:
// When someone send message comand like `/lunch`, then it reply random restaruant name etc.
const functions = require('@google-cloud/functions-framework');
var TelegramBot = require('telegrambot');
var api = new TelegramBot('9999999999:AAAA_bbbb-cccDD-EEEEEEEEEE-9999-FFF');

const restaurants = [
    "Samgyopsal",
    "Dino",
    "Arig",
    "La viva",
    "Gurvan gal",
    "Buuz",
    "Uulzbar",
    "Stockholm",
    "Jade",
    "Grand",
    "Business plaza",
    "Limo",
    "Ayanchin",
    "Chopsticks",
    "Burger King",
    "Fat Hen"
];

const bars = [
    "Samgyopsal",
    "Gurvan gal",
    "Uulzbar",
    "Stockholm",
    "Jade",
    "Chopsticks",
    "Fat Hen",
    "Brooklyn",
    "MB"
];

functions.http('randrest', async (req, res) => {
    let message = "";

    console.log(JSON.stringify(req.body));

    if (req.body?.message?.chat?.id === -746615751 && req.body?.message?.text?.match(/^\/lunch/g)) {
        message = `Сайн уу, @${req.body.message.from.username}? Өдрийг сайхан өнгөрүүлж байна уу?
Өнөөдөр бөөнөөрөө ${restaurants[Math.floor(Math.random()*restaurants.length)]} орылдоо 😇`;
    } else if (req.body?.message?.chat?.id === -746615751 && req.body?.message?.text?.match(/^\/guntseg/g)) {
        message = `Эёоу, @${req.body.message.from.username}, шөнийг яажшуухан өнгөрөөх гэжийндаа?
Өнөөдөр бөөнөөрөө ${bars[Math.floor(Math.random()*bars.length)]} орж бут авылдаа 😈`;
    } else if (req.body.message.text.match(/^\/ping/g)) {
        message = "pong"
    } else if (req.body.message.text.match(/^\/ching/g)) {
        message = "chong"
    } else if (req.body.message.text.match(/^\/marko/g)) {
        message = "polo"
    } else if (req.body.message.text.match(/^\/jimijimi/g)) {
        message = "haja haja"
    }

    if (message) {
        await api.sendMessage({
            chat_id: "-746615751",
            text: message,
            reply_to_message_id: req.body.message.message_id
        }, (err, message) => {
            if (err) throw err;
            console.log(message);
        });
    }

    res.send("ok");
});

This works on Google Cloud Functions