Pinia + Electron: Cannot use fs for Local File Access

[smithGit]

I have a nice Quasar Electron app that is getting big and I would like to perform all of the local file processing, both read and write, from within Pinia. However, I get the following error: Module 'fs' has been externalized for browser compatibility and cannot be accessed in client code.
Looking into this, I see a statement that Pinia: "can work in both Server and Client side." So - how can I get Pinia to work in server side mode in a manner that fs can be used? Does anyone have a good (simple) example?