How to get all users of Telergam bot?

Question

Node.js

I am using https://github.com/yagop/node-telegram-bot-api for my bot.
Tell me how can I get a list of all bot chats (all who use the bot)?
I did not find a suitable method in the bots API ...
And not a big passing question, can I find out when the user deletes the chat (stops using the bot) ?

Answer 1

To get all users, you need to remember them somewhere, and take them from there.
To learn, whether deletes - it is impossible. Is it possible to make a native "exit" button

Answer 2

It is best to capture the user when they enter the /start command.