Fix Next.js 16 Build Error: why-is-node-running & Turbopack Crash

Description

If you are seeing why-is-node-running or thread-stream errors in Next.js 16, it’s not your code. It’s Turbopack. I spent hours tracking this down so you don't have to. In this video: • The exact error to look for. • Why serverExternalPackages isn't enough. • The stable version you need to revert to immediately. Save your weekend. Fix it in 60 seconds.