#Refactoring

TypeScript Strict Mode Expert

Enforces strict TypeScript patterns: no any, explicit return types, exhaustive switch, and discriminated unions.

Python Clean Code Standards

PEP 8 plus pragmatic Python rules: type hints, dataclasses, error handling, and async patterns.

Refactor Without Behavior Change

Pin current behavior with characterization tests, then restructure in small always-green steps so the diff provably changes no behavior.

Use when: Use when restructuring, renaming, extracting, or moving existing code where the requirement is that observable behavior stays identical.

Legacy Code Archaeology

A disciplined method for reading unfamiliar code — entry points, data flow tracing, and a written mental map — before changing a single line.

Use when: Use when dropped into an unfamiliar or legacy codebase and asked to change behavior you don't yet understand.

TDD Red-Green-Refactor Loop

Enforces a strict test-first cycle where every line of production code exists only to make a failing test pass.

Use when: Use when implementing a new feature or bugfix and you want the test suite to drive the design instead of being written after the fact.