From 5f269fb09f7bd7e0a7ba83baa6de85e9c56c9164 Mon Sep 17 00:00:00 2001
From: devjiwonchoi <devjiwonchoi@gmail.com>
Date: Wed, 19 Nov 2025 10:05:37 +0100
Subject: [PATCH] Add flag to show ignore listed frames

---
 packages/next/src/server/patch-error-inspect.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/packages/next/src/server/patch-error-inspect.ts b/packages/next/src/server/patch-error-inspect.ts
index e3a107a6a4aba7..16d93066f1a2e4 100644
--- a/packages/next/src/server/patch-error-inspect.ts
+++ b/packages/next/src/server/patch-error-inspect.ts
@@ -327,8 +327,7 @@ function parseAndSourceMap(
   error: Error,
   inspectOptions: util.InspectOptions
 ): string {
-  // TODO(veil): Expose as CLI arg or config option. Useful for local debugging.
-  const showIgnoreListed = false
+  const showIgnoreListed = process.env.__NEXT_SHOW_IGNORE_LISTED === 'true'
   // We overwrote Error.prepareStackTrace earlier so error.stack is not sourcemapped.
   let unparsedStack = String(error.stack)
   // We could just read it from `error.stack`.