From 4e5024643e8c0f4f083ff0b1912e25ba7de15f5a Mon Sep 17 00:00:00 2001
From: Nicolas Hrubec <nico.hrubec@sentry.io>
Date: Wed, 18 Feb 2026 14:04:59 +0100
Subject: [PATCH] Set sourcemapexcludesources to false from vite plugin

---
 .../src/vite/sentryTanstackStart.ts           |  7 +++++-
 .../src/vite/sourceMaps.ts                    | 25 +++++++++++++++++++
 .../test/vite/sentryTanstackStart.test.ts     | 22 ++++++++++++++--
 3 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/packages/tanstackstart-react/src/vite/sentryTanstackStart.ts b/packages/tanstackstart-react/src/vite/sentryTanstackStart.ts
index d14033ff052d..538906be8545 100644
--- a/packages/tanstackstart-react/src/vite/sentryTanstackStart.ts
+++ b/packages/tanstackstart-react/src/vite/sentryTanstackStart.ts
@@ -1,7 +1,11 @@
 import type { BuildTimeOptionsBase } from '@sentry/core';
 import type { Plugin } from 'vite';
 import { makeAutoInstrumentMiddlewarePlugin } from './autoInstrumentMiddleware';
-import { makeAddSentryVitePlugin, makeEnableSourceMapsVitePlugin } from './sourceMaps';
+import {
+  makeAddSentryVitePlugin,
+  makeEnableSourceMapsVitePlugin,
+  makeNitroSourcemapExcludeSourcesPlugin,
+} from './sourceMaps';
 
 /**
  * Build-time options for the Sentry TanStack Start SDK.
@@ -62,6 +66,7 @@ export function sentryTanstackStart(options: SentryTanstackStartOptions = {}): P
   const sourceMapsDisabled = options.sourcemaps?.disable === true || options.sourcemaps?.disable === 'disable-upload';
   if (!sourceMapsDisabled) {
     plugins.push(...makeEnableSourceMapsVitePlugin(options));
+    plugins.push(makeNitroSourcemapExcludeSourcesPlugin(options));
   }
 
   return plugins;
diff --git a/packages/tanstackstart-react/src/vite/sourceMaps.ts b/packages/tanstackstart-react/src/vite/sourceMaps.ts
index e9ee193b8d8a..3eef46bf743a 100644
--- a/packages/tanstackstart-react/src/vite/sourceMaps.ts
+++ b/packages/tanstackstart-react/src/vite/sourceMaps.ts
@@ -101,6 +101,31 @@ export function makeEnableSourceMapsVitePlugin(options: BuildTimeOptionsBase): P
   ];
 }
 
+/**
+ * A Sentry plugin for TanStack Start to set `sourcemapExcludeSources: false` in the Nitro config.
+ *
+ * By default, Nitro sets `sourcemapExcludeSources: true`, which means the original source code is not included
+ * in the source maps. This makes it impossible for Sentry to display un-minified code snippets on the Issues page.
+ */
+export function makeNitroSourcemapExcludeSourcesPlugin(_options: BuildTimeOptionsBase): Plugin {
+  return {
+    name: 'sentry-tanstackstart-nitro-sourcemap-exclude-sources',
+    apply: 'build',
+    enforce: 'post',
+    config() {
+      return {
+        nitro: {
+          rollupConfig: {
+            output: {
+              sourcemapExcludeSources: false,
+            },
+          },
+        },
+      } as UserConfig;
+    },
+  };
+}
+
 /** There are 3 ways to set up source map generation (https://github.com/getsentry/sentry-javascript/issues/13993)
  *
  *     1. User explicitly disabled source maps
diff --git a/packages/tanstackstart-react/test/vite/sentryTanstackStart.test.ts b/packages/tanstackstart-react/test/vite/sentryTanstackStart.test.ts
index ef18da74d03a..1b5fdadcac00 100644
--- a/packages/tanstackstart-react/test/vite/sentryTanstackStart.test.ts
+++ b/packages/tanstackstart-react/test/vite/sentryTanstackStart.test.ts
@@ -22,6 +22,13 @@ const mockEnableSourceMapsPlugin: Plugin = {
   config: vi.fn(),
 };
 
+const mockNitroSourcemapExcludeSourcesPlugin: Plugin = {
+  name: 'sentry-tanstackstart-nitro-sourcemap-exclude-sources',
+  apply: 'build',
+  enforce: 'post',
+  config: vi.fn(),
+};
+
 const mockMiddlewarePlugin: Plugin = {
   name: 'sentry-tanstack-middleware-auto-instrument',
   apply: 'build',
@@ -31,6 +38,7 @@ const mockMiddlewarePlugin: Plugin = {
 vi.mock('../../src/vite/sourceMaps', () => ({
   makeAddSentryVitePlugin: vi.fn(() => [mockSourceMapsConfigPlugin, mockSentryVitePlugin]),
   makeEnableSourceMapsVitePlugin: vi.fn(() => [mockEnableSourceMapsPlugin]),
+  makeNitroSourcemapExcludeSourcesPlugin: vi.fn(() => mockNitroSourcemapExcludeSourcesPlugin),
 }));
 
 vi.mock('../../src/vite/autoInstrumentMiddleware', () => ({
@@ -51,7 +59,12 @@ describe('sentryTanstackStart()', () => {
     it('returns source maps plugins in production mode', () => {
       const plugins = sentryTanstackStart({ autoInstrumentMiddleware: false });
 
-      expect(plugins).toEqual([mockSourceMapsConfigPlugin, mockSentryVitePlugin, mockEnableSourceMapsPlugin]);
+      expect(plugins).toEqual([
+        mockSourceMapsConfigPlugin,
+        mockSentryVitePlugin,
+        mockEnableSourceMapsPlugin,
+        mockNitroSourcemapExcludeSourcesPlugin,
+      ]);
     });
 
     it('returns no plugins in development mode', () => {
@@ -86,7 +99,12 @@ describe('sentryTanstackStart()', () => {
         sourcemaps: { disable: false },
       });
 
-      expect(plugins).toEqual([mockSourceMapsConfigPlugin, mockSentryVitePlugin, mockEnableSourceMapsPlugin]);
+      expect(plugins).toEqual([
+        mockSourceMapsConfigPlugin,
+        mockSentryVitePlugin,
+        mockEnableSourceMapsPlugin,
+        mockNitroSourcemapExcludeSourcesPlugin,
+      ]);
     });
   });