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 |

Guidelines for proper React useEffect usage and avoiding unnecessary Effects. Use when writing, reviewing, or refactoring React components that use useEffect, useState, or handle side effects. Triggers on tasks involving React Effects, derived state, event handlers, data fetching, or component synchronization. Source: nbbaier/agent-skills.

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