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narrow-effect-dependencies

Optimize React useEffect dependency arrays to use primitive values.

Updated Feb 10, 2026
Search Tags:#performance#react#optimization#javascript#dependencies#useEffect
One-click install
npx skills add https://github.com/ihj04982/my-cursor-settings --skill narrow-effect-dependencies
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: narrow-effect-dependencies
Source: https://github.com/ihj04982/my-cursor-settings/tree/main/skills/narrow-effect-dependencies
Command: npx skills add https://github.com/ihj04982/my-cursor-settings --skill narrow-effect-dependencies

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps developers avoid unnecessary re-runs of React's useEffect hook by ensuring dependencies are primitive values or specific properties, rather than entire objects.

Core Features & Use Cases

  • Dependency Optimization: Reduces redundant effect executions by specifying precise dependencies.
  • Derived State Management: Guides on computing derived state outside of effects for better performance.
  • Use Case: Prevent a useEffect hook that only needs user.id from re-running every time any part of the user object changes.

Quick Start

Use the narrow-effect-dependencies skill to refactor the provided useEffect hook to use primitive dependencies.

Frequently Asked Questions about narrow-effect-dependencies

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does my React useEffect hook run unnecessarily when an object changes?▼

To optimize useEffect dependencies, replace entire object references in the dependency array with specific primitive properties, such as changing a user object dependency to just user.id, to prevent redundant effect executions.

How do I optimize React useEffect dependency arrays for better performance?▼

To optimize useEffect dependencies, replace entire object references in the dependency array with specific primitive properties, such as changing a user object dependency to just user.id, to prevent redundant effect executions.

What is the best way to handle object dependencies in React useEffect?▼

To handle derived state efficiently, compute it outside of the useEffect hook so the effect only depends on the primitive source values, avoiding extra re-renders caused by derived state changes.

How do I prevent useEffect from re-rendering when only one property of an object changes?▼

Use primitive dependencies like strings or numbers instead of object references to ensure your React useEffect hook only executes when the actual values change, avoiding unnecessary re-renders.

When should I compute derived state outside of a React useEffect hook?▼

You should compute derived state outside of useEffect when the derived values are needed for rendering, allowing the effect hook to depend solely on primitive source values and run less frequently.

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