Production Fixes
Incident-first troubleshooting pages you can share as single links.
Fix "No Firebase App [DEFAULT] has been created" in Flutter
Fix the "No Firebase App [DEFAULT] has been created" error by correctly initializing the Firebase app before calling any Firebase services in Flutter.
Fix "Parsing error: Cannot find module next/babel"
Resolve ESLint's 'Cannot find module next/babel' error by updating .eslintrc.json and aligning with Next.js 13+ SWC/Babel config. Includes monorepo fixes.
Fix useEffect Running Twice in React 18 — Strict Mode
Why useEffect runs twice in development and how to fix it with cleanup, AbortController, or useRef — without disabling Strict Mode.
How to Set Up Idempotency Key in Next.js (Step by Step)
If Stripe charges run twice in your Next.js app, learn how to add an idempotency key to every request and stop duplicate payments.
cookies() Should Be Awaited in Next.js 15/16: Fix
Fix the Next.js 'cookies() should be awaited' runtime error with server-safe patterns, copy-paste code, and production verification.
PostgreSQL Migration Rollback: Production Fix Playbook
Rollback production migrations safely with lock-aware sequencing, data safeguards, and verification checkpoints.
Next.js Server Actions Debugging: Production Fix Matrix
Diagnose Server Actions failures with a production matrix for cookies, cache invalidation, auth boundaries, and mutation flows.
TypeScript in 2026: Install & Configure with Node.js 20+
Install TypeScript 5.4.5+ with npm 9.8+, configure for Node.js 20.x LTS, and resolve Supabase/Next.js type errors — with strict tsconfig.json and Jest/ESLint setup.