feat(tanstackstart-react): Auto-instrument global middleware - #18844

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nicohrubec merged 53 commits into
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nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged

feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
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nh/automatic-middleware-instrumentation

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@nicohrubecnicohrubec commented Jan 16, 2026•
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This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.

Overview

The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:

createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:

import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage

Auto-instrumentation is enabled by default. To explicitly disable it:

// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.

Implementation Details

  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions

Testing

  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware

Follow-ups

Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.

Closes#18845

@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec self-assigned this Jan 16, 2026
@nicohrubec
nicohrubec marked this pull request as ready for review January 16, 2026 10:00
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--

View base workflow run

s1gr1d
s1gr1d reviewed Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts Outdated
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
}
// Track middlewares that couldn't be auto-wrapped
if (contents.trim()) {

@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious

@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it

sentry[bot]
sentryBot reviewed Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
cursor[bot]
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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
s1gr1d reviewed Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts Outdated
}

// Only wrap requestMiddleware and functionMiddleware in createStart()
if (!code.includes('createStart(')) {

@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.

@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement

@nicohrubec
nicohrubec merged commit 80b4705 into developJan 21, 2026
35 checks passed
@nicohrubec
nicohrubec deleted the nh/automatic-middleware-instrumentation branch January 21, 2026 17:13
@github-actionsgithub-actionsBot mentioned this pull request Jan 27, 2026
Closed
This was referenced Jan 27, 2026
Merged
Merged
nicohrubec added a commit that referenced this pull request Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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@sentrysentry[bot]sentry[bot] left review comments
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@s1gr1ds1gr1ds1gr1d approved these changes
@Lms24Lms24Awaiting requested review from Lms24
@andreiborzaandreiborzaAwaiting requested review from andreiborza

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Successfully merging this pull request may close these issues.

Auto-instrument global request/function middleware

2 participants

@nicohrubec@s1gr1d
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

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Member
This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
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Jan 19, 2026•

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size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
s1gr1d
reviewed
Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
sentryBot
reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
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reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
nicohrubec
deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
mentioned this pull request
Jan 27, 2026

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This was referenced Jan 27, 2026
 Merged

 Merged

nicohrubec added a commit
that referenced
this pull request
Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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@sentrysentry[bot]sentry[bot] left review comments
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@s1gr1ds1gr1ds1gr1d approved these changes
@Lms24Lms24Awaiting requested review from Lms24
@andreiborzaandreiborzaAwaiting requested review from andreiborza

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Successfully merging this pull request may close these issues.

Auto-instrument global request/function middleware


2 participants

@nicohrubec@s1gr1d

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

Loading

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Member
This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
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@github-actions
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Jan 19, 2026•

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Contributor
size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
s1gr1d
reviewed
Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
sentryBot
reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
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reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
nicohrubec
deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
mentioned this pull request
Jan 27, 2026

Closed


This was referenced Jan 27, 2026
 Merged

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nicohrubec added a commit
that referenced
this pull request
Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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@s1gr1ds1gr1ds1gr1d approved these changes
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Auto-instrument global request/function middleware


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@nicohrubec@s1gr1d

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

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This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
cursor[bot]

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@github-actions
github-actionsBot
commented
Jan 19, 2026•

edited

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Contributor
size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
s1gr1d
reviewed
Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Choose a reason for hiding this comment

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
sentryBot
reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
cursor[bot]
cursorBot
reviewed
Jan 20, 2026
View reviewed changes
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
s1gr1d
reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Choose a reason for hiding this comment

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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MemberAuthor
Choose a reason for hiding this comment

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
nicohrubec
deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
mentioned this pull request
Jan 27, 2026

Closed


This was referenced Jan 27, 2026
 Merged

 Merged

nicohrubec added a commit
that referenced
this pull request
Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment

Reviewers

@sentrysentry[bot]sentry[bot] left review comments
@cursorcursor[bot]cursor[bot] left review comments
@s1gr1ds1gr1ds1gr1d approved these changes
@Lms24Lms24Awaiting requested review from Lms24
@andreiborzaandreiborzaAwaiting requested review from andreiborza

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Successfully merging this pull request may close these issues.

Auto-instrument global request/function middleware


2 participants

@nicohrubec@s1gr1d

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

Loading

Copy link


Copy Markdown

Member
This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
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Jan 19, 2026•

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size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
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Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
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reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
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reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
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deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
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Jan 27, 2026

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This was referenced Jan 27, 2026
 Merged

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nicohrubec added a commit
that referenced
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Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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Auto-instrument global request/function middleware


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@nicohrubec@s1gr1d

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

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This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
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@github-actions
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Jan 19, 2026•

edited

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size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
s1gr1d
reviewed
Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
sentryBot
reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
s1gr1d
reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
nicohrubec
deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
mentioned this pull request
Jan 27, 2026

Closed


This was referenced Jan 27, 2026
 Merged

 Merged

nicohrubec added a commit
that referenced
this pull request
Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
Sign up for freeto join this conversation on GitHub.
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Reviewers

@sentrysentry[bot]sentry[bot] left review comments
@cursorcursor[bot]cursor[bot] left review comments
@s1gr1ds1gr1ds1gr1d approved these changes
@Lms24Lms24Awaiting requested review from Lms24
@andreiborzaandreiborzaAwaiting requested review from andreiborza

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Auto-instrument global request/function middleware


2 participants

@nicohrubec@s1gr1d

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat(tanstackstart-react): Auto-instrument global middleware - #18844
Merged
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
developfrom 
nh/automatic-middleware-instrumentation
Conversation
@nicohrubec
@nicohrubecnicohrubec
commented
Jan 16, 2026•

edited

Loading

Copy link


Copy Markdown

Member
This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
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marked this pull request as ready for review
January 16, 2026 10:00
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size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
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Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
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Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
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Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
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@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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Auto-instrument global request/function middleware


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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feat(tanstackstart-react): Auto-instrument global middleware - #18844
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nh/automatic-middleware-instrumentation
Jan 21, 2026
Merged
feat(tanstackstart-react): Auto-instrument global middleware#18844
nicohrubec merged 53 commits into
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nh/automatic-middleware-instrumentation
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@nicohrubecnicohrubec
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Jan 16, 2026•

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This PR adds automatic instrumentation for global request and function middleware in TanStack Start applications.
Overview
The sentryTanstackStart Vite plugin now automatically wraps requestMiddleware and functionMiddleware arrays in createStart() with Sentry instrumentation. This is done via a source code transformation during the build that converts:
createStart({
requestMiddleware: [myMiddleware],
functionMiddleware: [anotherMiddleware],
});

into:
import { wrapMiddlewaresWithSentry } from '@sentry/tanstackstart-react';
createStart({
requestMiddleware: wrapMiddlewaresWithSentry({ myMiddleware }),
functionMiddleware: wrapMiddlewaresWithSentry({ anotherMiddleware }),
});

Usage
Auto-instrumentation is enabled by default. To explicitly disable it:
// vite.config.ts
import { sentryTanstackStart } from '@sentry/tanstackstart-react';
export default defineConfig({
plugins: [
sentryTanstackStart({
org: 'your-org',
project: 'your-project',
autoInstrumentMiddleware: false, // Disable auto-instrumentation
}),
],
});

This should give users flexibility in case things go wrong.
Implementation Details
  • Uses a regex-based approach to transform source files containing createStart()
  • Skips transformation if the user has already manually wrapped middlewares with wrapMiddlewaresWithSentry
  • Only handles simple identifier arrays (e.g., [foo, bar]), not complex expressions
Testing
  • Updated E2E tests to use auto-instrumentation for global middleware
  • Updated unit tests for the sentryTanstackStart plugin
  • Added unit tests for autoInstrumentMiddleware
Follow-ups
Future PRs will add support for non-global request/function middleware. This PR focuses on global middleware to make it a bit easier to review. I also want to give users a bit more control by allowing them to disable auto-instrumentation on a file-level, but this doesn't make sense yet since the current implementation only patches a single file anyways.
Closes#18845
@nicohrubec
Add placeholder vite config wrapper
704a781
@nicohrubec
align usage with solidstart
6cc5784
@nicohrubec
Add placeholder to add plugins
b4a0d83
@nicohrubec
Add sentry vite plugin and enable source maps plugins automatically
b6ddbff
@nicohrubec
?
8c6f0fa
@nicohrubec
add unit tests
207a96a
@nicohrubec
add vite wrapper to e2e tests
53e9099
@nicohrubec
simplify unit tests
b9c51e9
@nicohrubec
use buildTimeOptionsBase instead of defining my own type
6eb1c8b
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
4dcdabf
@nicohrubec
.
9aaabd9
@nicohrubec
switch to sentry vite plugin
bfa238a
@nicohrubec
add changelog entry and pass down all options
086b9f6
@nicohrubec
clean
05e08f1
@nicohrubec
always add sentry vite plugin and pass down disable option
bc0acdd
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
8e60de8
@nicohrubec
readability
9bbd0b0
@nicohrubec
update tests
283a545
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
1e736b4
@nicohrubec
bump bundler plugins
841a311
@nicohrubec
update
9ad7a8d
@nicohrubec
update bundler plugins fr this time
286f624
@nicohrubec
Revert "update bundler plugins fr this time"
505c92c
This reverts commit 286f624.
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
07d5e77
@nicohrubec
Merge branch 'develop' into nh/tss-vite-config-wrapper
073e352
@nicohrubec
update sentry vite plugin
8ce5358
@nicohrubecnicohrubec
self-assigned this
Jan 16, 2026
@nicohrubec
nicohrubec
marked this pull request as ready for review
January 16, 2026 10:00
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size-limit report 📦
PathSize% ChangeChange
@sentry/browser25.2 kB--
@sentry/browser - with treeshaking flags23.71 kB--
@sentry/browser (incl. Tracing)42.02 kB--
@sentry/browser (incl. Tracing, Profiling)46.66 kB--
@sentry/browser (incl. Tracing, Replay)80.63 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags70.28 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)85.32 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)97.53 kB--
@sentry/browser (incl. Feedback)41.92 kB--
@sentry/browser (incl. sendFeedback)29.89 kB--
@sentry/browser (incl. FeedbackAsync)34.89 kB--
@sentry/browser (incl. Metrics)26.31 kB--
@sentry/browser (incl. Logs)26.46 kB--
@sentry/browser (incl. Metrics & Logs)27.11 kB--
@sentry/react26.93 kB--
@sentry/react (incl. Tracing)44.26 kB--
@sentry/vue29.64 kB--
@sentry/vue (incl. Tracing)43.82 kB--
@sentry/svelte25.22 kB--
CDN Bundle27.78 kB--
CDN Bundle (incl. Tracing)42.83 kB--
CDN Bundle (incl. Tracing, Logs, Metrics)43.65 kB--
CDN Bundle (incl. Tracing, Replay)79.53 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)84.97 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)85.89 kB--
CDN Bundle - uncompressed81.27 kB--
CDN Bundle (incl. Tracing) - uncompressed126.81 kB--
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed129.65 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed243.35 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed256.15 kB--
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed258.96 kB--
@sentry/nextjs (client)46.62 kB--
@sentry/sveltekit (client)42.39 kB--
@sentry/node-core51.9 kB--
@sentry/node165.46 kB--
@sentry/node - without tracing93.65 kB--
@sentry/aws-serverless109.16 kB--
View base workflow run
s1gr1d
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reviewed
Jan 19, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/sentryTanstackStart.ts
Outdated

Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
 return `${key}: wrapMiddlewaresWithSentry(${objContents})`;
 }
 // Track middlewares that couldn't be auto-wrapped
 if (contents.trim()) {
@s1gr1ds1gr1dJan 19, 2026

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Q: why do we trim the contents here? To make sure it's not an empty file? Just curious
@nicohrubecnicohrubecJan 20, 2026

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Just in case people have weird formatting and we match whitespace only when trying to match the middlewares, unlikely case but shouldn't hurt to have it
sentry[bot]
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reviewed
Jan 20, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
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Cursor Bugbot has reviewed your changes and found 1 potential issue.
Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
s1gr1d
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reviewed
Jan 21, 2026
View reviewed changes
Comment threadpackages/tanstackstart-react/src/vite/autoInstrumentMiddleware.ts
Outdated

 }

 // Only wrap requestMiddleware and functionMiddleware in createStart()
 if (!code.includes('createStart(')) {
@s1gr1ds1gr1dJan 21, 2026

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Just a minor improvement which could make sense: createStart() is always in start.ts right? I think you could check if id (the filename) contains start first as it's probably faster than checking every long code string if it contains createStart(.
@nicohrubecnicohrubecJan 21, 2026

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Jep I think that makes sense for now, added that as an additional check. Not sure if this is gonna stay, since I will extend the auto-instrumentation for middleware to also apply to other files, but for now it's a good improvement
@nicohrubec
nicohrubec
merged commit 80b4705
into
developJan 21, 2026

35 checks passed

@nicohrubec
nicohrubec
deleted the

nh/automatic-middleware-instrumentation

branch
January 21, 2026 17:13
@github-actionsgithub-actionsBot
mentioned this pull request
Jan 27, 2026

Closed


This was referenced Jan 27, 2026
 Merged

 Merged

nicohrubec added a commit
that referenced
this pull request
Jan 28, 2026
@nicohrubec
feat(tanstackstart-react): Auto-instrument request middleware (#18989)
5886804
Follow up to #18844
Extending auto-instrumentation to non-global server request middleware.
[TSS request middleware
docs](https://tanstack.com/start/latest/docs/framework/react/guide/middleware#request-middleware)
Closes#18846
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Auto-instrument global request/function middleware


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