大转转FE

Jun 25, 2026 · Backend Development

Refactoring a 1,000‑Line Untested Core File with AI: My Proven Workflow

The author refactors a 1,021‑line, zero‑test IM conversion module that is referenced in five places by building a characterization‑test net with esbuild stubs, generating 130 exhaustive samples, recording a golden baseline, applying three systematic code transformations, and verifying behavior and a 2.77× speedup, all without touching business logic.