fix(start): explicitly re-export public API to survive SSR cold-start cycle

.changeset/trim-start-meta-reexports.md

@@ -0,0 +1,7 @@
+---
+'@tanstack/react-start': patch
+'@tanstack/solid-start': patch
+'@tanstack/vue-start': patch
+---
+
+Explicitly re-export public API names from `@tanstack/start-client-core` (`createServerFn`, `createMiddleware`, `createStart`, `createCsrfMiddleware`, `createIsomorphicFn`, `createClientOnlyFn`, `createServerOnlyFn`) alongside the existing `export *`. The explicit named re-exports are registered at link time (via Vite SSR's `defineExport` at `fileStartIndex`), so the namespace has these getters before any import body runs — survives the cold-start SSR cycle through user middleware where `export *` would otherwise produce a partial facade (`createMiddleware is not a function`). Workaround for vitejs/vite#22491 / #22493.

packages/react-start/src/index.ts

@@ -1,6 +1,20 @@
 export { useServerFn } from './useServerFn'
 export * from '@tanstack/start-client-core'
-export { createServerFn } from '@tanstack/start-client-core'
+// Explicit re-exports shadow `export *` above so these public-API names are
+// registered on the namespace at link time (via Vite SSR's `defineExport`
+// at fileStartIndex), surviving the cold-start SSR cycle through user
+// middleware. See vitejs/vite#22491 / #22493. Trim list to genuine public
+// API only; internals fall through `export *` and are safe because they
+// aren't imported at top level in the cycle path.
+export {
+  createClientOnlyFn,
+  createCsrfMiddleware,
+  createIsomorphicFn,
+  createMiddleware,
+  createServerFn,
+  createServerOnlyFn,
+  createStart,
+} from '@tanstack/start-client-core'
 export { Hydrate } from '@tanstack/react-start-client'
 export type {
   HydrateOptions,

packages/solid-start/src/index.ts

@@ -1,5 +1,20 @@
 export { useServerFn } from './useServerFn'
 export * from '@tanstack/start-client-core'
+// Explicit re-exports shadow `export *` above so these public-API names are
+// registered on the namespace at link time (via Vite SSR's `defineExport`
+// at fileStartIndex), surviving the cold-start SSR cycle through user
+// middleware. See vitejs/vite#22491 / #22493. Trim list to genuine public
+// API only; internals fall through `export *` and are safe because they
+// aren't imported at top level in the cycle path.
+export {
+  createClientOnlyFn,
+  createCsrfMiddleware,
+  createIsomorphicFn,
+  createMiddleware,
+  createServerFn,
+  createServerOnlyFn,
+  createStart,
+} from '@tanstack/start-client-core'
 export { Hydrate } from '@tanstack/solid-start-client'
 export type {
   HydrateOptions,

packages/vue-start/src/index.ts

@@ -1,2 +1,17 @@
 export { useServerFn } from './useServerFn'
 export * from '@tanstack/start-client-core'
+// Explicit re-exports shadow `export *` above so these public-API names are
+// registered on the namespace at link time (via Vite SSR's `defineExport`
+// at fileStartIndex), surviving the cold-start SSR cycle through user
+// middleware. See vitejs/vite#22491 / #22493. Trim list to genuine public
+// API only; internals fall through `export *` and are safe because they
+// aren't imported at top level in the cycle path.
+export {
+  createClientOnlyFn,
+  createCsrfMiddleware,
+  createIsomorphicFn,
+  createMiddleware,
+  createServerFn,
+  createServerOnlyFn,
+  createStart,
+} from '@tanstack/start-client-core'