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User Interface Wiki

Living wiki of UI design patterns and best practices built with Fumadocs, Next.js, and Base UI components.

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rules/exit-key-required.md

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rules/exit-key-required.md

1---
2title: Unique Keys in AnimatePresence Lists
3impact: HIGH
4tags: exit, key, list
5---
6 
7## Unique Keys in AnimatePresence Lists
8 
9Dynamic lists inside AnimatePresence must have unique keys.
10 
11**Incorrect (index as key):**
12 
13```tsx
14<AnimatePresence>
15  {items.map((item, index) => (
16    <motion.div key={index} exit={{ opacity: 0 }} />
17  ))}
18</AnimatePresence>
19```
20 
21**Correct (stable unique key):**
22 
23```tsx
24<AnimatePresence>
25  {items.map((item) => (
26    <motion.div key={item.id} exit={{ opacity: 0 }} />
27  ))}
28</AnimatePresence>
29```
30

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User Interface Wiki

rules/exit-key-required.md