WhiskeySockets/Baileys ? reverse-engineered prompt

I want to build a tool that lets me programmatically interact with WhatsApp. It should be a TypeScript library that runs in Node.js and connects to the WhatsApp Web API using WebSockets, similar to how the Baileys project works.

The main functions I need are to connect to WhatsApp (handling the QR code scan part), send and receive text messages, and maybe get a list of my contacts and groups. It should be able to listen for events like a new message arriving and then let me trigger a response.

Essentially, I'm looking for a simple, unofficial WhatsApp bot API for a personal project. Please structure it as a clean Node.js project with a basic example script showing how to log in and send a "hello world" message to a specific phone number. You can look up docs on how the WhatsApp Web protocol works if needed.