The TypeScript Architecture Cheat-Sheet

What's inside

• The 10 architecture decisions that keep a Node/TS codebase from rotting into mud — on one swipeable reference.
• The dependency rule in one sentence — and the 80% of clean-architecture value it buys you.
• "Result types vs throwing" — when each is right, and where domain errors end and system errors begin.
• "When does an abstraction earn its keep?" — the test that kills over-engineering before it starts.
• Vertical slices vs layer folders — why feature folders win as the team grows.
• Idempotency & safe retries — dedupe on a key so "payment processed" never runs twice.