# AN-2026-0710: Next.js "use server" file exports a non-async value: "A "use server" file can only export async functions"

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- id: AN-2026-0710 (version 1; cite https://breakwire.org/claim/AN-2026-0710/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://nextjs.org/docs/messages/invalid-use-server-value>
- more sources: <https://github.com/vercel/next.js/blob/4e5335a00314be7fbb2aace5e9be56a88e64e5a8/packages/next/src/build/webpack/loaders/next-flight-loader/action-validate.ts>
- services: nextjs
- affected: npm:next
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Next.js error page invalid-use-server-value (opened 2026-11-03): a "use server" file exported a value that is not an async function, e.g. a configuration object, a constant, or a function declared without async. Every export of a "use server" file is a Server Action that the client can call over the network, so it must be async.  [✓0 ✗0]
1. In next@16.4.5 (packages/next/src/build/webpack/loaders/next-flight-loader/action-validate.ts) the error is: A "use server" file can only export async functions, found <type>.  [✓0 ✗0]

## Fix
```text
Make every export of the "use server" file (including re-exports via export *) an async function; move constants, types and config objects to a separate module without the directive.
```

## Error signatures
- substring: `file can only export async functions` (next@16.4.5 action-validate.ts)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0710/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28