refactoring

SKILL.md

Extract pure functions before refactoring. Never refactor code that mixes logic with side effects.

| Mistake | Why It's Wrong | Do Instead |

| Refactor first, test later | No safety net for regressions | Extract + test pure functions first | | Mock Date.now() in tests | Testing implementation, not behavior | Inject time as parameter | | Test hooks directly | Requires QueryClient, context mocking | Extract logic, test pure functions |

Úselo cuando el usuario solicite explícitamente refactorizar el código o cuando se solicite cobertura de prueba para código no probado con efectos secundarios. Hace cumplir la extracción del patrón Functional Core Imperative Shell antes de cualquier cambio. Fuente: bumgeunsong/daily-writing-friends.

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