[next] Add handling for not found routes with i18n

packages/now-next/src/index.ts

@@ -1658,6 +1658,10 @@ export const build = async ({
         );
       }
 
+      const isNotFound = prerenderManifest.notFoundRoutes.includes(
+        routeFileNoExt
+      );
+
       const htmlFsRef = isBlocking
         ? // Blocking pages do not have an HTML fallback
           null
@@ -1745,7 +1749,7 @@ export const build = async ({
         lambda = lambdas[outputSrcPathPage];
       }
 
-      if (initialRevalidate === false) {
+      if (!isNotFound && initialRevalidate === false) {
         if (htmlFsRef == null || jsonFsRef == null) {
           throw new NowBuildError({
             code: 'NEXT_HTMLFSREF_JSONFSREF',
@@ -1760,7 +1764,7 @@ export const build = async ({
         }
       }
 
-      if (prerenders[outputPathPage] == null) {
+      if (prerenders[outputPathPage] == null && !isNotFound) {
         if (lambda == null) {
           throw new NowBuildError({
             code: 'NEXT_MISSING_LAMBDA',

packages/now-next/src/utils.ts

@@ -752,6 +752,8 @@ export type NextPrerenderedRoutes = {
   };
 
   omittedRoutes: string[];
+
+  notFoundRoutes: string[];
 };
 
 export async function getExportIntent(
@@ -842,6 +844,7 @@ export async function getPrerenderManifest(
       fallbackRoutes: {},
       bypassToken: null,
       omittedRoutes: [],
+      notFoundRoutes: [],
     };
   }
 
@@ -887,6 +890,7 @@ export async function getPrerenderManifest(
         preview: {
           previewModeId: string;
         };
+        notFoundRoutes?: string[];
       } = JSON.parse(await fs.readFile(pathPrerenderManifest, 'utf8'));
 
   switch (manifest.version) {
@@ -901,6 +905,7 @@ export async function getPrerenderManifest(
         bypassToken:
           (manifest.preview && manifest.preview.previewModeId) || null,
         omittedRoutes: [],
+        notFoundRoutes: [],
       };
 
       routes.forEach(route => {
@@ -955,8 +960,13 @@ export async function getPrerenderManifest(
         fallbackRoutes: {},
         bypassToken: manifest.preview.previewModeId,
         omittedRoutes: [],
+        notFoundRoutes: [],
       };
 
+      if (manifest.notFoundRoutes) {
+        ret.notFoundRoutes.push(...manifest.notFoundRoutes);
+      }
+
       routes.forEach(route => {
         const {
           initialRevalidateSeconds,
@@ -1010,6 +1020,7 @@ export async function getPrerenderManifest(
         fallbackRoutes: {},
         bypassToken: null,
         omittedRoutes: [],
+        notFoundRoutes: [],
       };
     }
   }

packages/now-next/test/fixtures/00-i18n-support-no-shared-lambdas/next.config.js

@@ -1,4 +1,7 @@
 module.exports = {
+  generateBuildId() {
+    return 'testing-build-id';
+  },
   experimental: {
     i18n: {
       locales: ['nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en-US', 'en'],

packages/now-next/test/fixtures/00-i18n-support-no-shared-lambdas/pages/not-found/fallback/[slug].js

@@ -0,0 +1,50 @@
+import Link from 'next/link';
+import { useRouter } from 'next/router';
+
+export default function Page(props) {
+  const router = useRouter();
+
+  if (router.isFallback) return 'Loading...';
+
+  return (
+    <>
+      <p id="gsp">gsp page</p>
+      <p id="props">{JSON.stringify(props)}</p>
+      <p id="router-locale">{router.locale}</p>
+      <p id="router-locales">{JSON.stringify(router.locales)}</p>
+      <p id="router-query">{JSON.stringify(router.query)}</p>
+      <p id="router-pathname">{router.pathname}</p>
+      <p id="router-as-path">{router.asPath}</p>
+      <Link href="/">
+        <a id="to-index">to /</a>
+      </Link>
+      <br />
+    </>
+  );
+}
+
+export const getStaticProps = ({ params, locale, locales }) => {
+  if (locale === 'en' || locale === 'nl') {
+    return {
+      unstable_notFound: true,
+    };
+  }
+
+  return {
+    props: {
+      params,
+      locale,
+      locales,
+    },
+  };
+};
+
+export const getStaticPaths = () => {
+  return {
+    // the default locale will be used since one isn't defined here
+    paths: ['first', 'second'].map(slug => ({
+      params: { slug },
+    })),
+    fallback: true,
+  };
+};

packages/now-next/test/fixtures/00-i18n-support-no-shared-lambdas/pages/not-found/index.js

@@ -0,0 +1,37 @@
+import Link from 'next/link';
+import { useRouter } from 'next/router';
+
+export default function Page(props) {
+  const router = useRouter();
+
+  return (
+    <>
+      <p id="gsp">gsp page</p>
+      <p id="props">{JSON.stringify(props)}</p>
+      <p id="router-locale">{router.locale}</p>
+      <p id="router-locales">{JSON.stringify(router.locales)}</p>
+      <p id="router-query">{JSON.stringify(router.query)}</p>
+      <p id="router-pathname">{router.pathname}</p>
+      <p id="router-as-path">{router.asPath}</p>
+      <Link href="/">
+        <a id="to-index">to /</a>
+      </Link>
+      <br />
+    </>
+  );
+}
+
+export const getStaticProps = ({ locale, locales }) => {
+  if (locale === 'en' || locale === 'nl') {
+    return {
+      unstable_notFound: true,
+    };
+  }
+
+  return {
+    props: {
+      locale,
+      locales,
+    },
+  };
+};

packages/now-next/test/fixtures/00-i18n-support/next.config.js

@@ -1,4 +1,7 @@
 module.exports = {
+  generateBuildId() {
+    return 'testing-build-id';
+  },
   experimental: {
     i18n: {
       locales: ['nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en-US', 'en'],

packages/now-next/test/fixtures/00-i18n-support/now.json

@@ -310,6 +310,81 @@
       "path": "/fr/gssp/first",
       "status": 200,
       "mustContain": "slug\":\"first\""
+    },
+
+    // TODO: update when directory listing is disabled
+    // and these are proper 404s
+    {
+      "path": "/en/not-found",
+      "status": 200,
+      "mustContain": "Index of"
+    },
+    {
+      "path": "/nl/not-found",
+      "status": 200,
+      "mustContain": "Index of"
+    },
+    {
+      "path": "/en-US/not-found",
+      "status": 200,
+      "mustContain": "lang=\"en-US\""
+    },
+    {
+      "path": "/nl-NL/not-found",
+      "status": 200,
+      "mustContain": "lang=\"nl-NL\""
+    },
+    {
+      "path": "/fr/not-found",
+      "status": 200,
+      "mustContain": "lang=\"fr\""
+    },
+
+    // this will always be a 200 unless fallback: blocking is used
+    // since the static fallback page is served before the 404
+    // page is rendered
+    {
+      "path": "/en/not-found/fallback/first",
+      "status": 200,
+      "mustContain": "lang=\"en\""
+    },
+    {
+      "path": "/en/not-found/fallback/first",
+      "status": 200,
+      "mustNotContain": "gsp page"
+    },
+    {
+      "path": "/_next/data/testing-build-id/en/not-found/fallback/first.json",
+      "status": 404
+    },
+    {
+      "path": "/en/not-found/fallback/first",
+      "status": 200,
+      "mustContain": "lang=\"en\""
+    },
+    {
+      "path": "/en/not-found/fallback/first",
+      "status": 200,
+      "mustNotContain": "gsp page"
+    },
+    {
+      "path": "/fr/not-found/fallback/first",
+      "status": 200,
+      "mustContain": "lang=\"fr\""
+    },
+    {
+      "path": "/_next/data/testing-build-id/fr/not-found/fallback/first.json",
+      "status": 200
+    },
+    {
+      "path": "/fr/not-found/fallback/first",
+      "status": 200,
+      "mustContain": "lang=\"fr\""
+    },
+    {
+      "path": "/fr/not-found/fallback/first",
+      "status": 200,
+      "mustContain": "gsp page"
     }
   ]
 }

packages/now-next/test/fixtures/00-i18n-support/pages/not-found/fallback/[slug].js

@@ -0,0 +1,50 @@
+import Link from 'next/link';
+import { useRouter } from 'next/router';
+
+export default function Page(props) {
+  const router = useRouter();
+
+  if (router.isFallback) return 'Loading...';
+
+  return (
+    <>
+      <p id="gsp">gsp page</p>
+      <p id="props">{JSON.stringify(props)}</p>
+      <p id="router-locale">{router.locale}</p>
+      <p id="router-locales">{JSON.stringify(router.locales)}</p>
+      <p id="router-query">{JSON.stringify(router.query)}</p>
+      <p id="router-pathname">{router.pathname}</p>
+      <p id="router-as-path">{router.asPath}</p>
+      <Link href="/">
+        <a id="to-index">to /</a>
+      </Link>
+      <br />
+    </>
+  );
+}
+
+export const getStaticProps = ({ params, locale, locales }) => {
+  if (locale === 'en' || locale === 'nl') {
+    return {
+      unstable_notFound: true,
+    };
+  }
+
+  return {
+    props: {
+      params,
+      locale,
+      locales,
+    },
+  };
+};
+
+export const getStaticPaths = () => {
+  return {
+    // the default locale will be used since one isn't defined here
+    paths: ['first', 'second'].map(slug => ({
+      params: { slug },
+    })),
+    fallback: true,
+  };
+};

packages/now-next/test/fixtures/00-i18n-support/pages/not-found/index.js

@@ -0,0 +1,37 @@
+import Link from 'next/link';
+import { useRouter } from 'next/router';
+
+export default function Page(props) {
+  const router = useRouter();
+
+  return (
+    <>
+      <p id="gsp">gsp page</p>
+      <p id="props">{JSON.stringify(props)}</p>
+      <p id="router-locale">{router.locale}</p>
+      <p id="router-locales">{JSON.stringify(router.locales)}</p>
+      <p id="router-query">{JSON.stringify(router.query)}</p>
+      <p id="router-pathname">{router.pathname}</p>
+      <p id="router-as-path">{router.asPath}</p>
+      <Link href="/">
+        <a id="to-index">to /</a>
+      </Link>
+      <br />
+    </>
+  );
+}
+
+export const getStaticProps = ({ locale, locales }) => {
+  if (locale === 'en' || locale === 'nl') {
+    return {
+      unstable_notFound: true,
+    };
+  }
+
+  return {
+    props: {
+      locale,
+      locales,
+    },
+  };
+};