[mattbrewsbytes]

I don't work with React directly but I'm aware with JS apps that a lot of package repos are needed to build so can all that work without internet (i.e. npm install, etc.)?

The good thing is you can practice this ahead of your retreat by turning off your wifi and trying to do work that you might do on your retreat. Then when you encounter something you need, figure out how to download it and run/install it locally. Then repeat until your local setup allows you to do work. The downside is you'll be limited to what you prepare ahead of time so there won't be any exploring available packages, downloading one to see if it works, etc.

Another approach is to try and learn something new with a book, that amount of time with a new language/framework and being new to it means you probably only need some basics to get going. You might want to download api/language docs in addition to the book as well in case you explore things outside of the scope of the book. Maybe try something adjacent to what you work on.