Backend & APIs
NestJS 12 Migration Guide: Upgrading from v11, Tested and Benchmarked
I upgraded a real NestJS 11 API to NestJS 12.1.3 with nest upgrade, fixed what broke (TypeScript 6, Jest and ESM, @Optional), and benchmarked v11 vs v12, Zod vs class-validator, Jest vs Vitest, ESLint vs oxlint, TypeScript 7 and Bun.
