Personally I don’t put my certs into node.
I setup my test environment to more closely match Twitch.
So I SSL terminate my front end test (and EBS) with nginx and proxy pass to node.
Then node doesn’t have to faff about with certs.
Also you don’t have to use node to serve your files.
I wrote about my methods on part 5 of my extension blog series Twitch Extensions Part 5 – Dev Environment – Barry Carlyon