From 939f8def08fd8ce865ca458c7820fa1bc2864e86 Mon Sep 17 00:00:00 2001
From: Joseph Chamochumbi <joseph.chamochumbi@vercel.com>
Date: Mon, 1 Jun 2026 23:40:41 +0200
Subject: [PATCH 1/2] refactor: use boolean instead of true | false in Instant
 type/schema

---
 .../src/build/segment-config/app/app-segment-config.ts    | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/packages/next/src/build/segment-config/app/app-segment-config.ts b/packages/next/src/build/segment-config/app/app-segment-config.ts
index a0d5ae10d333..7fc2ab07f9d9 100644
--- a/packages/next/src/build/segment-config/app/app-segment-config.ts
+++ b/packages/next/src/build/segment-config/app/app-segment-config.ts
@@ -30,11 +30,7 @@ const InstantConfigObjectSchema = z
   })
   .strict()
 
-const InstantConfigSchema = z.union([
-  InstantConfigObjectSchema,
-  z.literal(true),
-  z.literal(false),
-])
+const InstantConfigSchema = z.union([InstantConfigObjectSchema, z.boolean()])
 
 const PrefetchSchema = z.enum([
   'auto',
@@ -43,7 +39,7 @@ const PrefetchSchema = z.enum([
   'force-runtime',
 ])
 
-export type Instant = InstantConfig | true | false
+export type Instant = InstantConfig | boolean
 
 export type Prefetch =
   | 'auto'

From 87df11183f0f1c69bcfe7a417238385028f33539 Mon Sep 17 00:00:00 2001
From: Joseph Chamochumbi <joseph.chamochumbi@vercel.com>
Date: Mon, 1 Jun 2026 23:44:07 +0200
Subject: [PATCH 2/2] fix: move ValidationLevel so NextConfig keeps its TSDoc

---
 packages/next/src/server/config-shared.ts | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/packages/next/src/server/config-shared.ts b/packages/next/src/server/config-shared.ts
index b5774cd7db9b..f7386c6f8bdf 100644
--- a/packages/next/src/server/config-shared.ts
+++ b/packages/next/src/server/config-shared.ts
@@ -439,6 +439,12 @@ export function resolveCssChunkingMode(
   return 'loose'
 }
 
+export type ValidationLevel =
+  | 'warning'
+  | 'manual-warning'
+  | 'experimental-error'
+  | 'experimental-manual-error'
+
 export interface ExperimentalConfig {
   /**
    * A string that is incorporated into content-addressed output filenames
@@ -1363,13 +1369,6 @@ export type ExportPathMap = {
  *
  * Read more: [Next.js Docs: `next.config.js`](https://nextjs.org/docs/app/api-reference/config/next-config-js)
  */
-
-export type ValidationLevel =
-  | 'warning'
-  | 'manual-warning'
-  | 'experimental-error'
-  | 'experimental-manual-error'
-
 export interface NextConfig {
   allowedDevOrigins?: string[]