coupling
Use when props가 3개 이상 컴포넌트 계층을 통과하거나, 하나의 Hook이 5개 이상 값을 반환하거나, A 수정 시 관련 없는 B가 깨질 때
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/toss/frontend-fundamentals --skill coupling- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads coupling automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
결합도
코드 변경의 영향 범위를 최소화한다. 한 기능 변경이 다른 기능을 깨뜨리면 안 된다.
핵심 패턴
Props Drilling 제거 (조합 패턴)
❌ props가 계층을 통과:
function ItemEditModal({ items, onConfirm, onClose }) {
return (
<Modal onClose={onClose}>
<ItemEditBody items={items} onConfirm={onConfirm} onClose={onClose} />
</Modal>
);
}
function ItemEditBody({ items, onConfirm, onClose }) {
return (
<>
<Button onClick={onClose}>닫기</Button>
<ItemEditList items={items} onConfirm={onConfirm} />
</>
);
}
✅ children으로 조합:
function ItemEditModal({ items, onConfirm, onClose }) {
return (
<Modal onClose={onClose}>
<ItemEditBody onClose={onClose}>
<ItemEditList items={items} onConfirm={onConfirm} />
</ItemEditBody>
</Modal>
);
}
function ItemEditBody({ children, onClose }) {
return <><Button onClick={onClose}>닫기</Button>{children}</>;
}
책임 분리
❌ 모든 것을 관리하는 Hook:
function usePageState() {
const [query] = useQueryParams({
cardId: NumberParam, dateFrom: DateParam, dateTo: DateParam, statusList: ArrayParam
});
}
✅ 단일 책임 Hook:
function useCardIdQueryParam() {
const [cardId, setCardId] = useQueryParam("cardId", NumberParam);
return [cardId ?? undefined, setCardId] as const;
}
빠른 참조
| 코드 냄새 | 개선 방법 |
|---|---|
| 3개 이상 계층 통과하는 props | 조합 패턴: children 사용 |
| 5개 이상 반환하는 Hook | 단일 책임 Hook으로 분리 |
| A 수정 시 관련 없는 B 깨짐 | 결합 지점 식별 후 인터페이스 도입 |
| 모든 곳에서 import하는 util | 사용처 가까이로 이동 |
Context가 적절한 경우
진정한 전역 관심사만: 테마, 로케일, 인증 상태, 10개 이상 컴포넌트가 필요한 데이터.
조합 패턴을 피하려고 Context 남용하지 말 것.
예외: 중복이 나은 경우
- 페이지마다 동작이 달라질 여지가 있을 때
- 공통 코드 수정 시 모든 의존 코드 테스트 부담이 클 때
참고: https://frontend-fundamentals.com/code-quality/loosely-coupled/
FAQ
What does the coupling skill do?
Use when props가 3개 이상 컴포넌트 계층을 통과하거나, 하나의 Hook이 5개 이상 값을 반환하거나, A 수정 시 관련 없는 B가 깨질 때
How do I install coupling?
Run npx skills add https://github.com/toss/frontend-fundamentals --skill coupling in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/coupling/ (personal) or .claude/skills/coupling/ (project).
Which AI agents can use coupling?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is coupling safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains coupling?
It is published by toss in toss/frontend-fundamentals. It has 55 recorded installs.
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