Does Twitch Use NPM Packages? If So, How Do You Deal With Licensing Issues

Hey there, I might not be in the right spot, but I am trying to figure out a Saas solution, and I look at Twitch as a “role model” of sorts. I’ve been looking at software packages im trying to use, and it says if it’s GPL or LGPL, then I have to have my code open source? Meaning I pretty have to let everyone be able to download my whole app? Does Twitch have any examples of this?