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Closes: https://linear.app/vercel/issue/DOC-6221/nextjs-split-route-segments-files-in-preparation-for-instant
34 lines
1.6 KiB
Plaintext
34 lines
1.6 KiB
Plaintext
---
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title: preferredRegion
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description: API reference for the preferredRegion route segment config option.
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---
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The `preferredRegion` option allows you to specify the preferred deployment region for a route segment. This value is passed to your deployment platform.
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```tsx filename="layout.tsx | page.tsx | route.ts" switcher
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export const preferredRegion = // string || string[]
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```
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```js filename="layout.js | page.js | route.js" switcher
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export const preferredRegion = // string || string[]
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```
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- **`string`**: Deploy the route to a specific region. Available region codes are platform-specific. For example, `'iad1'`.
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- **`string[]`**: Deploy the route to multiple specific regions. The route is deployed to **all** listed regions, not a single one chosen from the list. For example, `['iad1', 'sfo1']`.
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> **Good to know**:
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>
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> - If a `preferredRegion` is not specified, it will inherit the option of the nearest parent layout. The root layout defaults to `'auto'`.
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> - A child segment's value overrides the parent, values are not merged.
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> - Next.js passes the region values through to the deployment platform. The exact behavior and available region codes are platform-specific. Refer to your deployment platform's documentation for supported values.
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## Vercel
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If deploying Next.js on Vercel, regions are only supported if `export const runtime = 'edge'` is set. The following options can be passed:
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- **`'auto'`** (default): Uses the default region.
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- **`'global'`**: Prefer deploying the route to all availableregions.
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- **`'home'`**: Prefer deploying the route to the home region.
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If an unsupported value is passed, an error will be thrown.
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