From ead23093ebef2564d24290af70c28a900607aae0 Mon Sep 17 00:00:00 2001
From: ha1fstack <61955474+ha1fstack@users.noreply.github.com>
Date: Tue, 12 Aug 2025 11:24:05 +0900
Subject: [PATCH 1/2] feat

---
 packages/core/src/integrations/extraerrordata.ts    |  7 ++++++-
 .../test/lib/integrations/extraerrordata.test.ts    | 13 ++++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/packages/core/src/integrations/extraerrordata.ts b/packages/core/src/integrations/extraerrordata.ts
index 291648244f6c..64acd10e113f 100644
--- a/packages/core/src/integrations/extraerrordata.ts
+++ b/packages/core/src/integrations/extraerrordata.ts
@@ -115,7 +115,12 @@ function _extractErrorData(
     // Error.cause is a standard property that is non enumerable, we therefore need to access it separately.
     // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause
     if (captureErrorCause && error.cause !== undefined) {
-      extraErrorInfo.cause = isError(error.cause) ? error.cause.toString() : error.cause;
+      if (isError(error.cause)) {
+        const causeName = error.cause.name || error.cause.constructor.name;
+        extraErrorInfo.cause = { [causeName]: _extractErrorData(error.cause as ExtendedError, false, maxValueLength) };
+      } else {
+        extraErrorInfo.cause = error.cause;
+      }
     }
 
     // Check if someone attached `toJSON` method to grab even more properties (eg. axios is doing that)
diff --git a/packages/core/test/lib/integrations/extraerrordata.test.ts b/packages/core/test/lib/integrations/extraerrordata.test.ts
index a6470c3f6b2c..f935acc689f9 100644
--- a/packages/core/test/lib/integrations/extraerrordata.test.ts
+++ b/packages/core/test/lib/integrations/extraerrordata.test.ts
@@ -55,9 +55,11 @@ describe('ExtraErrorData()', () => {
     });
   });
 
-  it('doesnt choke on linked errors and stringify names instead', () => {
+  it('should extract error data from the error cause with the same policy', () => {
     const error = new TypeError('foo') as ExtendedError;
-    error.cause = new SyntaxError('bar');
+    error.cause = new SyntaxError('bar') as ExtendedError;
+    error.cause.baz = 42;
+    error.cause.foo = 'a'.repeat(300);
 
     const enhancedEvent = extraErrorData.processEvent?.(
       event,
@@ -69,7 +71,12 @@ describe('ExtraErrorData()', () => {
 
     expect(enhancedEvent.contexts).toEqual({
       TypeError: {
-        cause: 'SyntaxError: bar',
+        cause: {
+          SyntaxError: {
+            baz: 42,
+            foo: `${'a'.repeat(250)}...`,
+          },
+        },
       },
     });
   });

From e3b12e7ee23dc151ae9de250800d57b957a5adc8 Mon Sep 17 00:00:00 2001
From: ha1fstack <61955474+ha1fstack@users.noreply.github.com>
Date: Tue, 12 Aug 2025 11:24:30 +0900
Subject: [PATCH 2/2] chore: rename variable

---
 packages/core/src/integrations/extraerrordata.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/integrations/extraerrordata.ts b/packages/core/src/integrations/extraerrordata.ts
index 64acd10e113f..ae65739aed5f 100644
--- a/packages/core/src/integrations/extraerrordata.ts
+++ b/packages/core/src/integrations/extraerrordata.ts
@@ -116,8 +116,8 @@ function _extractErrorData(
     // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause
     if (captureErrorCause && error.cause !== undefined) {
       if (isError(error.cause)) {
-        const causeName = error.cause.name || error.cause.constructor.name;
-        extraErrorInfo.cause = { [causeName]: _extractErrorData(error.cause as ExtendedError, false, maxValueLength) };
+        const errorName = error.cause.name || error.cause.constructor.name;
+        extraErrorInfo.cause = { [errorName]: _extractErrorData(error.cause as ExtendedError, false, maxValueLength) };
       } else {
         extraErrorInfo.cause = error.cause;
       }