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 |

正确使用 React useEffect 并避免不必要的 Effects 的指南。在编写、审查或重构使用 useEffect、useState 或处理副作用的 React 组件时使用。触发涉及 React Effects、派生状态、事件处理程序、数据获取或组件同步的任务。 来源：nbbaier/agent-skills。

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