firebase

# Firebase Skill Firebase/Firestore patterns for web and mobile applications with real-time data, offline support, and security rules. **Sources:** [Firebase Docs](https://firebase.google.com/docs) | [Firestore Best Practices](https://firebase.google.com/docs/firestore/best-practices) | [Security Rules](https://firebase.google.com/docs/rules) --- ## Core Principle **Denormalize with purpose, secure with rules, scale horizontally.** Firestore is a document database - embrace denormalization for read efficiency. Security rules are your server-side validation. Design for your access patterns. --- ## Firebase Stack | Service | Purpose | |---------|---------| | **Firestore** | NoSQL document database with real-time sync | | **Authentication** | User auth, OAuth, anonymous sessions | | **Storage** | File uploads with security rules | | **Functions** | Serverless backend (Node.js) | | **Hosting** | Static site + CDN | | **Extensions** | Pre-built solutions (Stripe, Algolia, etc.) | --- ## Project Setup ### Install Firebase CLI ```bash # Install globally npm install -g firebase-tools # Login firebase login # Initialize in project firebase init ``` ### Initialize with Emulators ```bash firebase init emulators # Start local development firebase emulators:start ``` ### Project Structure ``` project/ ├── firebase.json # Firebase config ├── firestore.rules # Security rules ├── firestore.indexes.json # Composite indexes ├── storage.rules # Sto...