What is the method for accessing an anonymous function within a JavaScript Object?

Currently facing an issue with a Node.js package called Telegraf, which is a bot framework. The problem arises when trying to create typings for it in TypeScript. The package exports the following:

module.exports = Object.assign(Telegraf, {
    Composer,
    Extra,
    Markup,
    Router,
    Telegram,
    session
})

The TypeScript import looks like this:

import * as Telegraf from 'telegraf';

However, upon accessing it, the Telegraf object appears like this:

{ Composer: [Function: Composer],
  Extra: { [Function: Extra] Markup: [Function: Markup] },
  Markup: [Function: Markup],
  Router: [Function: Router],
  Telegram: [Function: Telegram],
  session: [Function],
  default:
  { [Function: Telegraf]
     Composer: [Function: Composer],
     Extra: { [Function: Extra] Markup: [Function: Markup] },
     Markup: [Function: Markup],
     Router: [Function: Router],
     Telegram: [Function: Telegram],
     session: [Function] } }

The question now is: how can I access the [Function: Telegraf] in Telegraf.default?

Note

You might wonder, why does he want to access this specific property? The reason being that I need to replicate the following Node.js code in TypeScript:

const Telegraf = require('telegraf');

const bot = new Telegraf(process.env.BOT_TOKEN);

For more information about Telegraf, visit:

javascriptnode.jstypescripttypingtelegraf

Answer №1

It's quite unusual to see this [Function: Telegraf] displayed without a key or name, as it renders the object invalid.

Nevertheless, if we assume that the default object is valid and only contains that function along with these keys 

['Extra', 'Markup', 'Router', 'Telegram', 'session']
, one option is to filter out those keys and run the function associated with the filtered key:

let key = Object.keys(Telegraf.default)
                .filter(k => !['Extra', 'Markup', 'Router', 'Telegram', 'session'].includes(k));

Telegraf.default[key.pop()]() // <-- Time to execute the function!

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