War Story: TypeScript 5.6 Type Error Broke 1000+ Components – How We Fixed It in 2 Hours

Monday mornings are never fun, but this one took the cake. At 9:03 AM, our CI/CD pipeline failed on a routine feature branch deployment, spitting out 1,247 type errors across 1,100+ React components. The culprit? A silent dependency upgrade to TypeScript 5.6 over the weekend that introduced a breaking change to generic type inference for our shared component library.

The Incident: 1000+ Errors and Counting

Our team maintains a large React codebase with ~2,000 components, backed by a shared UI kit with generic components like Select , Dropdown , and Table .…