react-effect-patterns

SKILL.md

Effects are an escape hatch from React for synchronizing with external systems. Removing unnecessary Effects makes code easier to follow, faster to run, and less error-prone.

| Transform data | Calculate during render | | Expensive calculation | useMemo | | Reset all state on prop | key attribute | | Adjust state on prop | Derive during render | | Share event logic | Extract function, call from handlers | | User events | Event handlers | | External system sync | Effect | | Notify parent | Update in handler or lift state |

| Init once | Module-level or guard variable | | External store | useSyncExternalStore | | Fetch data | Effect with cleanup |

正確使用 React useEffect 並避免不必要的 Effects 的指南。在編寫、審查或重構使用 useEffect、useState 或處理副作用的 React 組件時使用。觸發涉及 React Effects、派生狀態、事件處理程序、數據獲取或組件同步的任務。 來源：nbbaier/agent-skills。

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