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Add a tunnel route helper for TanStack Start React#20264

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lazarnikolov/js-2140-tanstack-start-tunnel-adapter
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Add a tunnel route helper for TanStack Start React#20264
nikolovlazar wants to merge 4 commits intodevelopfrom
lazarnikolov/js-2140-tanstack-start-tunnel-adapter

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@nikolovlazar nikolovlazar commented Apr 13, 2026

Summary

  • add createSentryTunnelRoute to @sentry/tanstackstart-react as a one-line server route adapter around the core tunnel handler
  • export the new helper from the server entrypoint and add focused unit coverage for the POST-only route shape and request forwarding

Notes

  • yarn.lock contains unrelated changes and should be reviewed separately

Testing

  • cd packages/tanstackstart-react && yarn test
  • manually verified in the TanStack Start e2e app in dev-packages that /monitor returns 200 and forwards envelopes to a real Sentry project. I also made sure session replays are being handled correctly. Screenshots from my Sentry org's usage indicating the events were received:
SCR-20260413-nnol SCR-20260413-nnrr SCR-20260413-nppm

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linear-code bot commented Apr 13, 2026

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github-actions bot commented Apr 13, 2026

Semver Impact of This PR

None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).


New Features ✨

Cloudflare

  • Split alarms into multiple traces and link them by JPeer264 in #19373
  • Propagate traceparent to RPC calls - via fetch by JPeer264 in #19991

Core

  • Automatically disable truncation when span streaming is enabled in LangGraph integration by andreiborza in #20231
  • Automatically disable truncation when span streaming is enabled in LangChain integration by andreiborza in #20230
  • Automatically disable truncation when span streaming is enabled in Google GenAI integration by andreiborza in #20229
  • Automatically disable truncation when span streaming is enabled in Anthropic AI integration by andreiborza in #20228
  • Automatically disable truncation when span streaming is enabled in Vercel AI integration by andreiborza in #20232
  • Automatically disable truncation when span streaming is enabled in OpenAI integration by andreiborza in #20227
  • Add enableTruncation option to Vercel AI integration by nicohrubec in #20195
  • Add enableTruncation option to Google GenAI integration by andreiborza in #20184
  • Add enableTruncation option to Anthropic AI integration by andreiborza in #20181
  • Add enableTruncation option to LangGraph integration by andreiborza in #20183
  • Add enableTruncation option to LangChain integration by andreiborza in #20182
  • Add enableTruncation option to OpenAI integration by andreiborza in #20167
  • Export a reusable function to add tracing headers by JPeer264 in #20076

Deps

  • Bump axios from 1.13.5 to 1.15.0 by dependabot in #20180
  • Bump hono from 4.12.7 to 4.12.12 by dependabot in #20118
  • Bump defu from 6.1.4 to 6.1.6 by dependabot in #20104

Other

  • (browser) Add View Hierarchy integration by timfish in #14981
  • (node) Include global scope for eventLoopBlockIntegration by timfish in #20108
  • (node-native) Add support for V8 v14 (Node v25+) by timfish in #20125

Bug Fixes 🐛

Deno

  • Handle reader.closed rejection from releaseLock() in streaming by andreiborza in #20187
  • Avoid inferring invalid span op from Deno tracer by Lms24 in #20128

Other

  • (ci) Prevent command injection in ci-metadata workflow by fix-it-felix-sentry in #19899
  • (core, node) Support loading Express options lazily by isaacs in #20211
  • (e2e) Add op check to waitForTransaction in React Router e2e tests by copilot-swe-agent in #20193
  • (node-integration-tests) Fix flaky kafkajs test race condition by copilot-swe-agent in #20189

Internal Changes 🔧

Ci

  • Remove node-overhead GitHub Action by mydea in #20246
  • Bump dorny/paths-filter from v3.0.1 to v4.0.1 by mydea in #20251
  • Remove codecov steps from jobs that produce no coverage/JUnit data by mydea in #20244

Deps

  • Bump hono from 4.12.7 to 4.12.12 in /dev-packages/e2e-tests/test-applications/cloudflare-hono by dependabot in #20119
  • Bump axios from 1.13.5 to 1.15.0 in /dev-packages/e2e-tests/test-applications/nestjs-basic by dependabot in #20179

Other

  • (bugbot) Add rules to flag test-flake-provoking patterns by Lms24 in #20192
  • (deps-dev) Bump vite from 7.2.0 to 7.3.2 in /dev-packages/e2e-tests/test-applications/tanstackstart-react by dependabot in #20107
  • (react) Remove duplicated test mock by s1gr1d in #20200
  • (size-limit) Bump failing size limit scenario by Lms24 in #20186
  • Fix lint warnings by mydea in #20250
  • Fix flaky ANR test by increasing blocking duration by JPeer264 in #20239
  • Add automatic flaky test detector by nicohrubec in #18684

Other

  • Add a tunnel route helper for TanStack Start React by nikolovlazar in #20264

🤖 This preview updates automatically when you update the PR.

@nikolovlazar nikolovlazar marked this pull request as ready for review April 13, 2026 19:34
Copilot AI review requested due to automatic review settings April 13, 2026 19:34
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Pull request overview

Adds a TanStack Start server-route helper in @sentry/tanstackstart-react to make setting up a Sentry tunnel endpoint a one-liner, with unit tests to validate the POST-only route shape and forwarding behavior.

Changes:

  • Introduce createSentryTunnelRoute which wraps @sentry/core’s handleTunnelRequest for TanStack Start server routes.
  • Export the helper from the package’s server entrypoint.
  • Add unit tests covering the POST-only handler shape and correct request/options forwarding.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File Description
yarn.lock Lockfile updates (not directly related to the new tunnel helper).
packages/tanstackstart-react/src/server/tunnelRoute.ts Adds createSentryTunnelRoute helper wrapping the core tunnel handler.
packages/tanstackstart-react/src/server/index.ts Re-exports createSentryTunnelRoute from the server entrypoint.
packages/tanstackstart-react/test/server/tunnelRoute.test.ts Adds focused unit tests for handler shape and forwarding behavior.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Fix All in Cursor

Bugbot Autofix prepared a fix for the issue found in the latest run.

  • ✅ Fixed: Missing integration or E2E test for new feature
    • Added E2E test file (tunnel.test.ts) and tunnel route (api.tunnel.ts) to verify createSentryTunnelRoute functionality in the tanstackstart-react E2E test application.

Create PR

Or push these changes by commenting:

@cursor push b1fe0b60b9
Preview (b1fe0b60b9)
diff --git a/dev-packages/e2e-tests/test-applications/tanstackstart-react/src/routes/api.tunnel.ts b/dev-packages/e2e-tests/test-applications/tanstackstart-react/src/routes/api.tunnel.ts
new file mode 100644
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/tanstackstart-react/src/routes/api.tunnel.ts
@@ -1,0 +1,8 @@
+import { createFileRoute } from '@tanstack/react-router';
+import { createSentryTunnelRoute } from '@sentry/tanstackstart-react';
+
+export const Route = createFileRoute('/api/tunnel')({
+  server: createSentryTunnelRoute({
+    allowedDsns: [process.env.E2E_TEST_DSN || ''],
+  }),
+});

diff --git a/dev-packages/e2e-tests/test-applications/tanstackstart-react/tests/tunnel.test.ts b/dev-packages/e2e-tests/test-applications/tanstackstart-react/tests/tunnel.test.ts
new file mode 100644
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/tanstackstart-react/tests/tunnel.test.ts
@@ -1,0 +1,66 @@
+import { expect, test } from '@playwright/test';
+import { waitForError } from '@sentry-internal/test-utils';
+
+test('Tunnel route forwards envelopes to Sentry', async ({ baseURL }) => {
+  const errorEventPromise = waitForError('tanstackstart-react', errorEvent => {
+    return errorEvent?.exception?.values?.[0]?.value === 'Test error for tunnel route';
+  });
+
+  const dsn = process.env.E2E_TEST_DSN || '';
+  const [protocol, rest] = dsn.split('://');
+  const [auth, hostAndPath] = rest.split('@');
+  const [publicKey] = auth.split(':');
+  const [host, ...pathParts] = hostAndPath.split('/');
+  const projectId = pathParts[pathParts.length - 1];
+
+  const envelope = [
+    JSON.stringify({ event_id: crypto.randomUUID(), sent_at: new Date().toISOString() }),
+    JSON.stringify({
+      type: 'event',
+      length: 0,
+    }),
+    JSON.stringify({
+      exception: {
+        values: [
+          {
+            type: 'Error',
+            value: 'Test error for tunnel route',
+          },
+        ],
+      },
+      platform: 'javascript',
+      sdk: {
+        name: 'sentry.javascript.tanstackstart-react',
+        version: '0.0.0',
+      },
+      timestamp: Date.now() / 1000,
+    }),
+  ].join('\n');
+
+  const tunnelUrl = `${baseURL}/api/tunnel`;
+  const sentryUrl = `${protocol}://${host}/api/${projectId}/envelope/`;
+
+  const response = await fetch(tunnelUrl, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-sentry-envelope',
+      'X-Sentry-Auth': `Sentry sentry_key=${publicKey}, sentry_version=7`,
+    },
+    body: `${sentryUrl}\n${envelope}`,
+  });
+
+  expect(response.status).toBe(200);
+
+  const errorEvent = await errorEventPromise;
+
+  expect(errorEvent).toMatchObject({
+    exception: {
+      values: [
+        {
+          type: 'Error',
+          value: 'Test error for tunnel route',
+        },
+      ],
+    },
+  });
+});

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github-actions bot commented Apr 13, 2026

size-limit report 📦

Path Size % Change Change
@sentry/browser 25.73 kB - -
@sentry/browser - with treeshaking flags 24.22 kB - -
@sentry/browser (incl. Tracing) 42.72 kB - -
@sentry/browser (incl. Tracing, Profiling) 47.35 kB - -
@sentry/browser (incl. Tracing, Replay) 81.53 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 71.1 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 86.23 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 98.44 kB - -
@sentry/browser (incl. Feedback) 42.52 kB - -
@sentry/browser (incl. sendFeedback) 30.39 kB - -
@sentry/browser (incl. FeedbackAsync) 35.39 kB - -
@sentry/browser (incl. Metrics) 27.04 kB - -
@sentry/browser (incl. Logs) 27.19 kB - -
@sentry/browser (incl. Metrics & Logs) 27.86 kB - -
@sentry/react 27.48 kB - -
@sentry/react (incl. Tracing) 45.05 kB - -
@sentry/vue 30.56 kB - -
@sentry/vue (incl. Tracing) 44.58 kB - -
@sentry/svelte 25.75 kB - -
CDN Bundle 28.41 kB - -
CDN Bundle (incl. Tracing) 43.76 kB - -
CDN Bundle (incl. Logs, Metrics) 29.79 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 44.83 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 68.6 kB - -
CDN Bundle (incl. Tracing, Replay) 80.63 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 81.66 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 86.16 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 87.19 kB - -
CDN Bundle - uncompressed 83 kB - -
CDN Bundle (incl. Tracing) - uncompressed 129.79 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 87.14 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 133.2 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 210.13 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 246.67 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 250.07 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 259.58 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 262.97 kB - -
@sentry/nextjs (client) 47.47 kB - -
@sentry/sveltekit (client) 43.2 kB - -
@sentry/node-core 57.86 kB +0.02% +7 B 🔺
@sentry/node 175.07 kB +0.01% +9 B 🔺
@sentry/node - without tracing 97.97 kB +0.03% +22 B 🔺
@sentry/aws-serverless 115.22 kB +0.02% +19 B 🔺

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I think it is worth adding an e2e test case for this in one of the tanstack test applications we have.

It will also act as a live way to show how to set it up in an application, I think dev-packages/e2e-tests/test-applications/tanstackstart-react can be a good place for it or maybe a new application if you come across conflicts with pre-existing tests.

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nikolovlazar commented Apr 13, 2026

I think it is worth adding an e2e test case for this in one of the tanstack test applications we have.

It will also act as a live way to show how to set it up in an application, I think dev-packages/e2e-tests/test-applications/tanstackstart-react can be a good place for it or maybe a new application if you come across conflicts with pre-existing tests.

yes I did try that, but I needed to rip out the local tunnel that was defined at this file. In order not to risk breaking existing testing functionality, I didn't push the code. Should I create a different tanstack start app instead, @logaretm?

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@nikolovlazar Yep that works, or if you feel extra fancy check my comment here.

…github.com:getsentry/sentry-javascript into lazarnikolov/js-2140-tanstack-start-tunnel-adapter
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LGTM, nice one!

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3 participants