How to make a chatbot join a channel using JS?

API
4

Docs for TMI.js are here

https://docs.tmijs.org/

Support forum/issues is here:

Can’t really help with tmi.js on the Twitch Third party developers forum, you’d get better help with tmi.js on the tmi.js support location.

As per

https://docs.tmijs.org/v1.2.1/Configuration.html

I don’t see anything obviously wrong with your code, but I don’t use TMI.js might be a issue with that library