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next.js/errors/invalid-instant-configuration.mdx
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2026-03-10 19:37:31 +03:30

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---
title: Invalid Instant Configuration
---
## Why This Message Occurred
You provided an invalid configuration for `export const unstable_instant` in a Layout or Page file.
### Example of Correct Usage
#### Static Prefetching
```tsx filename="app/.../layout.tsx"
export const unstable_instant = {
prefetch: 'static',
}
```
#### Runtime Prefetching
```tsx filename="app/[slug]/page.tsx"
export const unstable_instant = {
prefetch: 'runtime',
samples: [
{
cookies: [{ name: 'experiment', value: 'A' }],
params: { slug: 'example' },
},
],
}
```
#### Indicating that there is no instant UI
This does not disable prefetching.
```tsx filename="app/[slug]/page.tsx"
export const unstable_instant = false
```