How to use private repo and local lib in typescript serverless functions?

I am struggling to find documentation or an answer through self testing to get my infrastructure setup.

I have simple hello world packages setup deploying to app platform through the github repo integration from control panel, but now I want to add private npm repo and a local root lib folder. Neither of which I am having much success with.

1. How can I use the environment variables for my .npmrc? It recognizes my npm repo as github but it keeps telling me I have no token.

@scope:registry=https://npm.pkg.github.com
//npm.pkg.github.com/:_authToken:${NPM_TOKEN}

I have tried echoing from preinstall, prepare, I have tried export NPM_TOKEN=NPM_TOKEN

2. How can I reference the root lib/ folder for my functions using typescript? My function just fails when I try to call it, it doesn’t give me any error during build.

Some examples covering these use cases would be extremely helpful.