react-useeffect

SKILL.md

Effects are an escape hatch from React. They let you synchronize with external systems. If there is no external system involved, you shouldn't need an Effect.

| Derived state from props/state | useState + useEffect | Calculate during render | | Expensive calculations | useEffect to cache | useMemo | | Reset state on prop change | useEffect with setState | key prop | | User event responses | useEffect watching state | Event handler directly |

| Notify parent of changes | useEffect calling onChange | Call in event handler | | Fetch data | useEffect without cleanup | useEffect with cleanup OR framework |

来自官方文档的 React useEffect 最佳实践。在编写/查看 useEffect、useState 以获得派生值、数据获取或状态同步时使用。教导何时不使用 Effect 和更好的替代方案。 来源：softaworks/agent-toolkit。

查看原文