From 7e5326aef7b9d461358ec8710a8499d1689a4d64 Mon Sep 17 00:00:00 2001
From: Max Leiter <max.leiter@vercel.com>
Date: Tue, 27 Jun 2023 12:11:01 -0700
Subject: [PATCH] transform stream

---
 packages/next/src/server/node-polyfill-web-streams.ts | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/next/src/server/node-polyfill-web-streams.ts b/packages/next/src/server/node-polyfill-web-streams.ts
index 7daa9f4c13f4..2d76b62331bb 100644
--- a/packages/next/src/server/node-polyfill-web-streams.ts
+++ b/packages/next/src/server/node-polyfill-web-streams.ts
@@ -11,7 +11,12 @@ if (!global.ReadableStream) {
   }
 }
 if (!global.TransformStream) {
-  const { TransformStream } =
-    require('next/dist/compiled/@edge-runtime/ponyfill') as typeof import('next/dist/compiled/@edge-runtime/ponyfill')
-  global.TransformStream = TransformStream
+  // Same as ReadableStream above.
+  if (require('stream').TransformStream) {
+    global.TransformStream = require('stream').TransformStream
+  } else {
+    const { TransformStream } =
+      require('next/dist/compiled/@edge-runtime/ponyfill') as typeof import('next/dist/compiled/@edge-runtime/ponyfill')
+    global.TransformStream = TransformStream
+  }
 }