Enable feature flag

packages/next/build/entries.ts

@@ -98,9 +98,7 @@ export function createEntrypoints(
     loadedEnvFiles: Buffer.from(JSON.stringify(loadedEnvFiles)).toString(
       'base64'
     ),
-    i18n: config.experimental.i18n
-      ? JSON.stringify(config.experimental.i18n)
-      : '',
+    i18n: config.i18n ? JSON.stringify(config.i18n) : '',
   }
 
   Object.keys(pages).forEach((page) => {

packages/next/build/index.ts

@@ -336,7 +336,7 @@ export default async function build(
         }
       }),
     dataRoutes: [],
-    i18n: config.experimental.i18n || undefined,
+    i18n: config.i18n || undefined,
   }
 
   await promises.mkdir(distDir, { recursive: true })
@@ -576,8 +576,8 @@ export default async function build(
             page,
             serverBundle,
             runtimeEnvConfig,
-            config.experimental.i18n?.locales,
-            config.experimental.i18n?.defaultLocale
+            config.i18n?.locales,
+            config.i18n?.defaultLocale
           )
 
           if (workerResult.isHybridAmp) {
@@ -739,7 +739,7 @@ export default async function build(
       // n.b. we cannot handle this above in combinedPages because the dynamic
       // page must be in the `pages` array, but not in the mapping.
       exportPathMap: (defaultMap: any) => {
-        const { i18n } = config.experimental
+        const { i18n } = config
 
         // Dynamically routed pages should be prerendered to be used as
         // a client-side skeleton (fallback) while data is being fetched.
@@ -878,7 +878,7 @@ export default async function build(
         pagesManifest[page] = relativeDest
       }
 
-      const { i18n } = config.experimental
+      const { i18n } = config
       const isNotFound = ssgNotFoundPaths.includes(page)
 
       // for SSG files with i18n the non-prerendered variants are
@@ -960,7 +960,7 @@ export default async function build(
       }
 
       if (isSsg) {
-        const { i18n } = config.experimental
+        const { i18n } = config
 
         // For a non-dynamic SSG page, we must copy its data file from export.
         if (!isDynamic) {

packages/next/build/webpack-config.ts

@@ -1004,12 +1004,8 @@ export default async function getBaseWebpackConfig(
         }),
         'process.env.__NEXT_ROUTER_BASEPATH': JSON.stringify(config.basePath),
         'process.env.__NEXT_HAS_REWRITES': JSON.stringify(hasRewrites),
-        'process.env.__NEXT_I18N_SUPPORT': JSON.stringify(
-          !!config.experimental.i18n
-        ),
-        'process.env.__NEXT_I18N_DOMAINS': JSON.stringify(
-          config.experimental.i18n.domains
-        ),
+        'process.env.__NEXT_I18N_SUPPORT': JSON.stringify(!!config.i18n),
+        'process.env.__NEXT_I18N_DOMAINS': JSON.stringify(config.i18n.domains),
         'process.env.__NEXT_ANALYTICS_ID': JSON.stringify(config.analyticsId),
         ...(isServer
           ? {

packages/next/export/index.ts

@@ -283,7 +283,7 @@ export default async function exportApp(
     }
   }
 
-  const { i18n } = nextConfig.experimental
+  const { i18n } = nextConfig
 
   if (i18n && !options.buildExport) {
     throw new Error(

packages/next/next-server/server/config.ts

@@ -45,6 +45,7 @@ const defaultConfig: { [key: string]: any } = {
   basePath: '',
   sassOptions: {},
   trailingSlash: false,
+  i18n: false,
   experimental: {
     cpus: Math.max(
       1,
@@ -62,7 +63,6 @@ const defaultConfig: { [key: string]: any } = {
     optimizeFonts: false,
     optimizeImages: false,
     scrollRestoration: false,
-    i18n: false,
   },
   future: {
     excludeDefaultMomentLocales: false,
@@ -310,8 +310,8 @@ function assignDefaults(userConfig: { [key: string]: any }) {
     }
   }
 
-  if (result.experimental?.i18n) {
-    const { i18n } = result.experimental
+  if (result.i18n) {
+    const { i18n } = result
     const i18nType = typeof i18n
 
     if (i18nType !== 'object') {

packages/next/next-server/server/next-server.ts

@@ -198,7 +198,7 @@ export default class Server {
           ? requireFontManifest(this.distDir, this._isLikeServerless)
           : null,
       optimizeImages: this.nextConfig.experimental.optimizeImages,
-      defaultLocale: this.nextConfig.experimental.i18n?.defaultLocale,
+      defaultLocale: this.nextConfig.i18n?.defaultLocale,
     }
 
     // Only the `publicRuntimeConfig` key is exposed to the client side
@@ -298,8 +298,7 @@ export default class Server {
       parsedUrl.query = parseQs(parsedUrl.query)
     }
 
-    const { basePath } = this.nextConfig
-    const { i18n } = this.nextConfig.experimental
+    const { basePath, i18n } = this.nextConfig
 
     if (basePath && req.url?.startsWith(basePath)) {
       // store original URL to allow checking if basePath was
@@ -577,7 +576,7 @@ export default class Server {
           // re-create page's pathname
           let pathname = `/${params.path.join('/')}`
 
-          const { i18n } = this.nextConfig.experimental
+          const { i18n } = this.nextConfig
 
           if (i18n) {
             const { host } = req?.headers || {}
@@ -1213,7 +1212,7 @@ export default class Server {
     const locale = query.__nextLocale as string
     delete query.__nextLocale
 
-    const { i18n } = this.nextConfig.experimental
+    const { i18n } = this.nextConfig
     const locales = i18n.locales as string[]
 
     let previewData: string | false | object | undefined
@@ -1243,7 +1242,7 @@ export default class Server {
         )
       }
 
-      if (this.nextConfig.experimental.i18n) {
+      if (this.nextConfig.i18n) {
         return normalizeLocalePath(path, locales).pathname
       }
       return path

packages/next/server/next-dev-server.ts

@@ -534,7 +534,7 @@ export default class DevServer extends Server {
 
     const __getStaticPaths = async () => {
       const { publicRuntimeConfig, serverRuntimeConfig } = this.nextConfig
-      const { locales, defaultLocale } = this.nextConfig.experimental.i18n || {}
+      const { locales, defaultLocale } = this.nextConfig.i18n || {}
 
       const paths = await this.staticPathsWorker.loadStaticPaths(
         this.distDir,

packages/next/telemetry/events/version.ts

@@ -114,8 +114,7 @@ export function eventCliSession(
 
   const userConfiguration = getNextConfig(phase, dir)
 
-  const { images, experimental } = userConfiguration || {}
-  const { i18n } = experimental || {}
+  const { images, i18n } = userConfiguration || {}
 
   const payload: EventCliSessionStarted = {
     nextVersion: process.env.__NEXT_VERSION,

test/integration/i18n-support/next.config.js

@@ -1,25 +1,23 @@
 module.exports = {
   // target: 'experimental-serverless-trace',
-  experimental: {
-    i18n: {
-      locales: ['nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en-US', 'en'],
-      defaultLocale: 'en-US',
-      domains: [
-        {
-          // used for testing, this should not be needed in most cases
-          // as production domains should always use https
-          http: true,
-          domain: 'example.be',
-          defaultLocale: 'nl-BE',
-          locales: ['nl', 'nl-NL', 'nl-BE'],
-        },
-        {
-          http: true,
-          domain: 'example.fr',
-          defaultLocale: 'fr',
-          locales: ['fr-BE'],
-        },
-      ],
-    },
+  i18n: {
+    locales: ['nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en-US', 'en'],
+    defaultLocale: 'en-US',
+    domains: [
+      {
+        // used for testing, this should not be needed in most cases
+        // as production domains should always use https
+        http: true,
+        domain: 'example.be',
+        defaultLocale: 'nl-BE',
+        locales: ['nl', 'nl-NL', 'nl-BE'],
+      },
+      {
+        http: true,
+        domain: 'example.fr',
+        defaultLocale: 'fr',
+        locales: ['fr-BE'],
+      },
+    ],
   },
 }

test/integration/telemetry/next.config.i18n-images

@@ -4,21 +4,19 @@ module.exports = phase => {
       sizes: [64, 128, 256, 512, 1024],
       domains: ['example.com'],
     },
-    experimental: {
-      i18n: {
-        locales: ['en','nl','fr'],
-        defaultLocale: 'en',
-        domains: [
-          {
-            domain: 'example.com',
-            defaultLocale: 'en'
-          },
-          {
-            domain: 'example.fr',
-            defaultLocale: 'fr'
-          }
-        ]
-      }
+    i18n: {
+      locales: ['en','nl','fr'],
+      defaultLocale: 'en',
+      domains: [
+        {
+          domain: 'example.com',
+          defaultLocale: 'en'
+        },
+        {
+          domain: 'example.fr',
+          defaultLocale: 'fr'
+        }
+      ]
     }
   }
 }