# Skill: refactor-guide

## Principle
Refactor by **extracting stable, framework-agnostic logic into `packages/sdk`**, then build UI shells in `packages/editor`.

## Steps
1. Identify domain concepts (widgets, data sources, canvas, layout).
2. Define types and pure operations in `sdk/core`.
3. Implement adapters behind interfaces (storage, network) in `sdk/runtime`.
4. In editor, consume only SDK public APIs.
5. Add tests to SDK for every extracted behavior.