My-Weekly-ToDo-List/.opencode/skills/react-best-practices/rules/rendering-hydration-suppress-warning.md
mARTin d92a8c7210 feat: add task actions (notes/delete) and refine animation logic
- Added 'onDelete' and 'onNotes' support to TaskItem.
- Implemented hover actions (Delete and Notes icons) for tasks.
- Added Notes Modal for editing task markdown content.
- Simplified navigation animation to remove blank flash (single-phase slide-in).
- Fixed syntax error in updateTask function.
- Updated styles for modal and task actions.
2026-02-01 12:25:53 +01:00

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---
title: Suppress Expected Hydration Mismatches
impact: LOW-MEDIUM
impactDescription: avoids noisy hydration warnings for known differences
tags: rendering, hydration, ssr, nextjs
---
## Suppress Expected Hydration Mismatches
In SSR frameworks (e.g., Next.js), some values are intentionally different on server vs client (random IDs, dates, locale/timezone formatting). For these *expected* mismatches, wrap the dynamic text in an element with `suppressHydrationWarning` to prevent noisy warnings. Do not use this to hide real bugs. Dont overuse it.
**Incorrect (known mismatch warnings):**
```tsx
function Timestamp() {
return <span>{new Date().toLocaleString()}</span>
}
```
**Correct (suppress expected mismatch only):**
```tsx
function Timestamp() {
return (
<span suppressHydrationWarning>
{new Date().toLocaleString()}
</span>
)
}
```