Remove unstable_ prefix from unstable_notFound

Author: ijjk

packages/next/next-server/server/render.tsx

@@ -625,7 +625,7 @@ export async function renderToHTML(
           key !== 'revalidate' &&
           key !== 'props' &&
           key !== 'unstable_redirect' &&
-          key !== 'unstable_notFound'
+          key !== 'notFound'
       )
 
       if (invalidKeys.includes('unstable_revalidate')) {
@@ -636,10 +636,10 @@ export async function renderToHTML(
         throw new Error(invalidKeysMsg('getStaticProps', invalidKeys))
       }
 
-      if (data.unstable_notFound) {
+      if (data.notFound) {
         if (pathname === '/404') {
           throw new Error(
-            `The /404 page can not return unstable_notFound in "getStaticProps", please remove it to continue!`
+            `The /404 page can not return notFound in "getStaticProps", please remove it to continue!`
           )
         }
 
@@ -754,19 +754,23 @@ export async function renderToHTML(
 
       const invalidKeys = Object.keys(data).filter(
         (key) =>
-          key !== 'props' &&
-          key !== 'unstable_redirect' &&
-          key !== 'unstable_notFound'
+          key !== 'props' && key !== 'unstable_redirect' && key !== 'notFound'
       )
 
+      if ((data as any).unstable_notFound) {
+        throw new Error(
+          `unstable_notFound has been renamed to notFound, please update the field to continue. Page: ${pathname}`
+        )
+      }
+
       if (invalidKeys.length) {
         throw new Error(invalidKeysMsg('getServerSideProps', invalidKeys))
       }
 
-      if ('unstable_notFound' in data) {
+      if ('notFound' in data) {
         if (pathname === '/404') {
           throw new Error(
-            `The /404 page can not return unstable_notFound in "getStaticProps", please remove it to continue!`
+            `The /404 page can not return notFound in "getStaticProps", please remove it to continue!`
           )
         }
 

packages/next/types/index.d.ts

@@ -89,7 +89,7 @@ export type GetStaticPropsResult<P> = {
   props?: P
   revalidate?: number | boolean
   unstable_redirect?: Redirect
-  unstable_notFound?: true
+  notFound?: true
 }
 
 export type GetStaticProps<
@@ -140,7 +140,7 @@ export type GetServerSidePropsResult<P> =
       unstable_redirect: Redirect
     }
   | {
-      unstable_notFound: true
+      notFound: true
     }
 
 export type GetServerSideProps<

test/integration/getserversideprops/pages/not-found/[slug].js

@@ -22,7 +22,7 @@ export default function Page(props) {
 export const getServerSideProps = ({ query }) => {
   if (query.hiding) {
     return {
-      unstable_notFound: true,
+      notFound: true,
     }
   }
 

test/integration/getserversideprops/pages/not-found/index.js

@@ -22,7 +22,7 @@ export default function Page(props) {
 export const getServerSideProps = ({ query }) => {
   if (query.hiding) {
     return {
-      unstable_notFound: true,
+      notFound: true,
     }
   }
 

test/integration/i18n-support/pages/not-found/fallback/[slug].js

@@ -26,7 +26,7 @@ export default function Page(props) {
 export const getStaticProps = ({ params, locale, locales }) => {
   if (locale === 'en' || locale === 'nl') {
     return {
-      unstable_notFound: true,
+      notFound: true,
     }
   }
 

test/integration/i18n-support/pages/not-found/index.js

@@ -24,7 +24,7 @@ export default function Page(props) {
 export const getStaticProps = ({ locale, locales }) => {
   if (locale === 'en' || locale === 'nl') {
     return {
-      unstable_notFound: true,
+      notFound: true,
     }
   }