From 7ab32b62ca662519695f5828e29e7cb67db280ef Mon Sep 17 00:00:00 2001
From: Tim Neutkens <tim@timneutkens.nl>
Date: Sun, 17 Sep 2023 11:06:09 +0200
Subject: [PATCH] Memoize getMiddlewareManifest

---
 packages/next/src/server/next-server.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/next/src/server/next-server.ts b/packages/next/src/server/next-server.ts
index 0271395ba1d13..6fe8d0d6e23dd 100644
--- a/packages/next/src/server/next-server.ts
+++ b/packages/next/src/server/next-server.ts
@@ -146,6 +146,7 @@ function getMiddlewareMatcher(
 
 export default class NextNodeServer extends BaseServer {
   protected middlewareManifestPath: string
+  protected middlewareManifest: MiddlewareManifest | undefined
   private _serverDistDir: string | undefined
   private imageResponseCache?: ResponseCache
   protected renderWorkersPromises?: Promise<void>
@@ -1338,7 +1339,13 @@ export default class NextNodeServer extends BaseServer {
 
   protected getMiddlewareManifest(): MiddlewareManifest | null {
     if (this.minimalMode) return null
+
+    if (this.middlewareManifest) {
+      return this.middlewareManifest
+    }
+
     const manifest: MiddlewareManifest = require(this.middlewareManifestPath)
+    this.middlewareManifest = manifest
     return manifest
   }