rerender-dependencies
Specify primitive dependencies instead of objects to minimize effect re-runs.
- Skills
- Web development
- 0
What it does and how to use it
A skill that teaches Claude Code to do web development tasks well. It is packaged knowledge the model uses whenever it is relevant.
- Install the skill (command above).
- In Claude Code, describe what you need - the skill turns on by itself when the context fits.
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Install (Claude Code)
mkdir -p .claude/skills/rerender-dependencies && curl -fsSL https://doutorai.pt/data/lib/skills__rerender-dependencies.md -o .claude/skills/rerender-dependencies/SKILL.mdPaste this command into the terminal, in your project folder, and the component installs automatically.
Content
---
title: Narrow Effect Dependencies
impact: MEDIUM
impactDescription: minimizes effect re-runs
tags: rerender, useEffect, dependencies, optimization
---
## Narrow Effect Dependencies
Specify primitive dependencies instead of objects to minimize effect re-runs.
**Incorrect (re-runs on any user field change):**
```tsx
useEffect(() => {
console.log(user.id)
}, [user])
```
**Correct (re-runs only when id changes):**
```tsx
useEffect(() => {
console.log(user.id)
}, [user.id])
```
**For derived state, compute outside effect:**
```tsx
// Incorrect: runs on width=767, 766, 765...
useEffe
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