init bot

.prettierrc

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+{
+  "printWidth": 100,
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

index.ts

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+import TelegramBot from 'node-telegram-bot-api'
+
+const TOKEN = process.env.TELEGRAM_TOKEN || ''
+const port = parseInt(process.env.PORT || '443', 10)
+const options = {
+  webHook: {
+    // Port to which you should bind is assigned to $PORT variable
+    // See: https://devcenter.heroku.com/articles/dynos#local-environment-variables
+    port,
+    // you do NOT need to set up certificates since Heroku provides
+    // the SSL certs already (https://<app-name>.herokuapp.com)
+    // Also no need to pass IP because on Heroku you need to bind to 0.0.0.0
+  },
+}
+// Heroku routes from port :443 to $PORT
+// Add URL of your app to env variable or enable Dyno Metadata
+// to get this automatically
+// See: https://devcenter.heroku.com/articles/dyno-metadata
+const url = process.env.APP_URL || 'https://<app-name>.herokuapp.com:443'
+const bot = new TelegramBot(TOKEN, options)
+
+// This informs the Telegram servers of the new webhook.
+// Note: we do not need to pass in the cert, as it already provided
+bot.setWebHook(`${url}/bot${TOKEN}`)
+
+// Just to ping!
+bot.on('message', function onMessage(msg) {
+  bot.sendMessage(msg.chat.id, 'I am alive on Heroku!')
+})