Pulse
ae39e45460
NOVAS SKILLS: - next-best-practices v0.1.0 (CLEAN) — Next.js App Router, RSC, caching, data - nextjs-patterns v1.0.0 (CLEAN) — Next.js 15: Server Actions, route handlers - vite v1.0.0 (CLEAN) — env vars, aliases, proxy, CJS compat - uncle-bob v1.0.0 (CLEAN) — Clean Code, SOLID, Clean Architecture - clean-code-review v1.0.0 (CLEAN) — naming, guard clauses, anti-patterns, refactoring - vue v1.0.0 (CLEAN) — Vue framework - vue-composition-api-best-practices v1.0.0 (CLEAN) — composables, Pinia, reactivity BIBLIOTECA INTELIGENTE libs/ (10 dominios, 11 arquivos): - typescript/ — TS safe + generics gotchas - react/ — Next.js App Router + Vite config - vue/ — Composition API + Pinia - linux/ — System diagnostic cheatsheet - database/ — PostgreSQL + MySQL patterns - browser/ — Chromium CLI + E2E testing - security/ — SAST audit (OWASP Top 10) - best-practices/ — Clean Code + SOLID + Clean Architecture - deploy/ — Docker multi-stack + OpenClaw ops - + INDEX.md como guia de navegacao .learnings/ — LRN-20260519-003 criado (biblioteca compartilhada)
92 lines
1.8 KiB
Markdown
92 lines
1.8 KiB
Markdown
# Hydration Errors
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Diagnose and fix React hydration mismatch errors.
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## Error Signs
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- "Hydration failed because the initial UI does not match"
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- "Text content does not match server-rendered HTML"
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## Debugging
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In development, click the hydration error to see the server/client diff.
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## Common Causes and Fixes
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### Browser-only APIs
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```tsx
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// Bad: Causes mismatch - window doesn't exist on server
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<div>{window.innerWidth}</div>
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// Good: Use client component with mounted check
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'use client'
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import { useState, useEffect } from 'react'
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export function ClientOnly({ children }: { children: React.ReactNode }) {
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const [mounted, setMounted] = useState(false)
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useEffect(() => setMounted(true), [])
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return mounted ? children : null
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}
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```
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### Date/Time Rendering
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Server and client may be in different timezones:
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```tsx
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// Bad: Causes mismatch
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<span>{new Date().toLocaleString()}</span>
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// Good: Render on client only
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'use client'
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const [time, setTime] = useState<string>()
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useEffect(() => setTime(new Date().toLocaleString()), [])
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```
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### Random Values or IDs
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```tsx
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// Bad: Random values differ between server and client
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<div id={Math.random().toString()}>
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// Good: Use useId hook
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import { useId } from 'react'
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function Input() {
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const id = useId()
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return <input id={id} />
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}
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```
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### Invalid HTML Nesting
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```tsx
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// Bad: Invalid - div inside p
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<p><div>Content</div></p>
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// Bad: Invalid - p inside p
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<p><p>Nested</p></p>
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// Good: Valid nesting
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<div><p>Content</p></div>
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```
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### Third-party Scripts
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Scripts that modify DOM during hydration.
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```tsx
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// Good: Use next/script with afterInteractive
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import Script from 'next/script'
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export default function Page() {
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return (
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<Script
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src="https://example.com/script.js"
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strategy="afterInteractive"
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/>
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)
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}
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```
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