Refactoring Firebase Studio Code for Production

Firebase Studio apps often have Firestore calls scattered directly in React components rather than in a data access layer. Firebase Auth state checks are duplicated across multiple components. Cloud Functions become large with multiple responsibilities in a single function

Create custom hooks that encapsulate Firestore subscriptions and include proper cleanup. Create a Firebase service module that centralizes all Firestore operations. Use Firebase's onAuthStateChanged in a single AuthProvider and distribute auth state via context. Split large Cloud Functions into focused single-responsibility functions

Not all Firebase Studio code needs refactoring. If it works, is secure, and you don't need to modify it, leave it alone. Refactor when: you need to add features and the current structure makes it difficult, bugs keep appearing in the same area of code, or onboarding new developers takes too long because the code is hard to understand.

The golden rule of refactoring: behavior stays the same, structure changes. Before refactoring any code, make sure you have tests covering the current behavior (or add them first). Refactor in small steps — change one thing at a time and verify the app still works. Use version control (git) to commit after each successful change so you can revert if something breaks.

A well-organized project has a predictable structure where anyone can find what they're looking for. Group files by feature (not by type), keep related code together, and use clear naming. Every file should have a single clear purpose. If you can't describe what a file does in one sentence, it's probably doing too much and should be split.