Fix middleware at root in standalone mode (#33053)

Fixes [a small bug](#32967 (comment)) that caused the build to crash if a _middleware is present at the root of the project and standalone mode is enabled.
vercel · Jan 6, 2022 · 6f5bfc1 · 6f5bfc1
1 parent efabf81
commit 6f5bfc1
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Showing 3 changed files with 11 additions and 1 deletion.
diff --git a/packages/next/build/utils.ts b/packages/next/build/utils.ts
@@ -1207,7 +1207,7 @@ export async function copyTracedFiles(
   for (const page of pageKeys) {
     if (MIDDLEWARE_ROUTE.test(page)) {
       const { files } =
-        middlewareManifest.middleware[page.replace(/\/_middleware$/, '')]
+        middlewareManifest.middleware[page.replace(/\/_middleware$/, '') || '/']
 
       for (const file of files) {
         const originalPath = path.join(distDir, file)

diff --git a/test/production/required-server-files.test.ts b/test/production/required-server-files.test.ts
@@ -121,6 +121,11 @@ describe('should set-up next', () => {
         )
       )
     ).toBe(true)
+    expect(
+      await fs.pathExists(
+        join(next.testDir, 'standalone/.next/server/pages/_middleware.js')
+      )
+    ).toBe(true)
   })
 
   it('should output required-server-files manifest correctly', async () => {

diff --git a/test/production/required-server-files/pages/_middleware.js b/test/production/required-server-files/pages/_middleware.js
@@ -0,0 +1,5 @@
+import { NextResponse } from 'next/server'
+
+export async function middleware(req) {
+  return NextResponse.next()
+}