firebase-cloud-functionslisted

# Cloud Functions for Firebase Serverless backend functions triggered by Firebase events (Firestore, Auth, Storage, HTTP, Pub/Sub, Scheduler, etc.). **2nd gen (Cloud Run)** is mandatory for all new code. ## Critical Rule: 2nd Gen Only Agent MUST use `firebase-functions/v2` imports. If 1st gen syntax is detected, convert to 2nd gen. See [gen_comparison.md](references/gen_comparison.md). ## References - **1st vs 2nd Gen Comparison**: [gen_comparison.md](references/gen_comparison.md) - **Idempotency & Infinite Loop Prevention**: [idempotency.md](references/idempotency.md) — THE most critical reference. Read before writing any triggered function. - **Scaling, Concurrency & Cold Start**: [scaling.md](references/scaling.md) - **Secrets & Environment Config**: [secrets.md](references/secrets.md) - **Triggers, Deployment & Runtime**: [triggers_and_deployment.md](references/triggers_and_deployment.md) - **Local Testing & Emulator Suite**: [local_testing.md](references/local_testing.md) — emulator setup, debugging, idempotency testing protocol, CI/CD integration. ## Agent Pre-Function Checklist Before generating ANY Cloud Function: 1. **2nd gen?** → `firebase-functions/v2` import. 1st gen = reject. 2. **Trigger type?** → Firestore onUpdate/onWrite = high loop risk. 3. **Idempotency guards?** → Event age check + before/after guard + transaction. ALL THREE for retry-enabled functions. 4. **Same document write?** → Guard is MANDATORY. No unconditional `update()` in Firestore trigg