fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
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onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

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@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

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onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

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@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

Conversation

@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
@github-actions

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

Conversation

@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
@github-actions

github-actionsBot commented Oct 20, 2025

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

Conversation

@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
@github-actions

github-actionsBot commented Oct 17, 2025

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
@github-actions

github-actionsBot commented Oct 20, 2025

Copy link
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Contributor

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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Member

Choose a reason for hiding this comment

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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Labels

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Development

Successfully merging this pull request may close these issues.

2 participants

@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

Conversation

@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

Copy link
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Contributor

Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
@github-actions

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

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@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
@github-actions

github-actionsBot commented Oct 20, 2025

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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2 participants

@onurtemizkan@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

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

Merged
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

Conversation

@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
@github-actions

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
@github-actions

github-actionsBot commented Oct 20, 2025

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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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Member

Choose a reason for hiding this comment

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

cursor[bot]

This comment was marked as outdated.

@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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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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fix(react): Patch spanEnd for potentially cancelled lazy-route transactions - #17962

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s1gr1d merged 7 commits into
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onur/react-router-cancelled-lazy-pageloads
Oct 23, 2025
Merged

fix(react): Patch spanEnd for potentially cancelled lazy-route transactions#17962
s1gr1d merged 7 commits into
developfrom
onur/react-router-cancelled-lazy-pageloads

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@onurtemizkan

@onurtemizkanonurtemizkan commented Oct 17, 2025

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Fixes an issue where pageload and navigation transactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.

This occurs when document.hidden triggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like /user/123/edit (URL-based) or /projects/*/views/* (wildcard-based) instead of the correct parameterized route like /user/:id/edit or /projects/:projectId/views/:viewId.

This fix patches span.end() to perform a final route resolution check before the span is sent, using the live global allRoutes Set to capture any lazy routes that loaded after the span was created but before it ended.

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 3 times, most recently from a09c3a7 to 03e62e7CompareOctober 17, 2025 10:34
@onurtemizkanonurtemizkan changed the title fix(react): Patch spanEnd for potentially cancelled lazy-route pageloadsfix(react): Patch spanEnd for potentially cancelled lazy-route transactionsOct 17, 2025
@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 03e62e7 to 7c622f8CompareOctober 17, 2025 13:13
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size-limit report 📦

PathSize% ChangeChange
@sentry/browser24.63 kB--
@sentry/browser - with treeshaking flags23.11 kB--
@sentry/browser (incl. Tracing)40.97 kB--
@sentry/browser (incl. Tracing, Profiling)45.26 kB--
@sentry/browser (incl. Tracing, Replay)79.29 kB--
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags68.97 kB--
@sentry/browser (incl. Tracing, Replay with Canvas)83.99 kB--
@sentry/browser (incl. Tracing, Replay, Feedback)96.16 kB--
@sentry/browser (incl. Feedback)41.3 kB--
@sentry/browser (incl. sendFeedback)29.29 kB--
@sentry/browser (incl. FeedbackAsync)34.22 kB--
@sentry/react26.31 kB--
@sentry/react (incl. Tracing)42.97 kB--
@sentry/vue29.11 kB--
@sentry/vue (incl. Tracing)42.75 kB--
@sentry/svelte24.64 kB--
CDN Bundle26.9 kB--
CDN Bundle (incl. Tracing)41.62 kB--
CDN Bundle (incl. Tracing, Replay)77.87 kB--
CDN Bundle (incl. Tracing, Replay, Feedback)83.35 kB--
CDN Bundle - uncompressed78.86 kB--
CDN Bundle (incl. Tracing) - uncompressed123.44 kB--
CDN Bundle (incl. Tracing, Replay) - uncompressed238.48 kB--
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed251.24 kB--
@sentry/nextjs (client)45.11 kB--
@sentry/sveltekit (client)41.4 kB--
@sentry/node-core50.75 kB+0.01%+1 B 🔺
@sentry/node156.91 kB--
@sentry/node - without tracing92.61 kB+0.01%+1 B 🔺
@sentry/aws-serverless106.33 kB--

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@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch 2 times, most recently from 20d8466 to 3345b67CompareOctober 20, 2025 13:54
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node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

ScenarioRequests/s% of BaselinePrev. Requests/sChange %
GET Baseline8,906-8,670+3%
GET With Sentry1,43116%1,343+7%
GET With Sentry (error only)6,25870%6,020+4%
POST Baseline1,204-1,173+3%
POST With Sentry56147%499+12%
POST With Sentry (error only)1,07890%1,047+3%
MYSQL Baseline3,349-3,280+2%
MYSQL With Sentry50415%425+19%
MYSQL With Sentry (error only)2,74982%2,670+3%

View base workflow run

@onurtemizkan
onurtemizkanforce-pushed the onur/react-router-cancelled-lazy-pageloads branch from 5ac0764 to e7270bcCompareOctober 20, 2025 15:13
@onurtemizkan
onurtemizkan marked this pull request as ready for review October 20, 2025 16:05
Comment threadpackages/react/src/reactrouter-compat-utils/instrumentation.tsx Outdated
* Patches the span.end() method to update the transaction name one last time before the span is sent.
* This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading.
*/
function patchSpanEnd(

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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.

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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.

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@s1gr1d
s1gr1d merged commit fd26569 into developOct 23, 2025
90 of 92 checks passed
@s1gr1d
s1gr1d deleted the onur/react-router-cancelled-lazy-pageloads branch October 23, 2025 14:35
s1gr1d added a commit that referenced this pull request Nov 24, 2025
…tions (#18155)
Building on top of #17962 Added a few more checks to make sure non-resolved (wildcard) routes are
not reported in lazy route pageloads / navigations.
- Improved `patchSpanEnd` with a user-configurable wait timeout for
potentially slow route resolution. Named this option as
`lazyRouteTimeout` and it's defaulted as `idleTimeout` * 3. It may
conditionally delay reporting (if the route resolution is still not done
by the end of the timeout), but will prevent prematurely sent lazy-route
transactions inside that window.
- Added extra checks on `updateNavigationSpan` and `handleNavigation`
for whether any wildcard still exists in a lazy-route, so they are still
marked as open to full resolution. We keep track of pending lazy-route
resolutions inside `pendingLazyRouteLoads`
- Added a final attempt to update the transaction name with
fully-resolved route when the pending resolution is done.
Any of these should not affect the behaviour of non-lazy route usage
---------
Co-authored-by: Sigrid <32902192+s1gr1d@users.noreply.github.com>
onurtemizkan added a commit that referenced this pull request Feb 10, 2026
…es (#19086)
This PR will resolve the core reason for the series of fixes / handling
for automatic lazy-route resolution for a while.
Related: #18898,
#18881,
#18346,
#18155,
#18098,
#17962,
#17867,
#17438,
#17277
The core issue we have been trying to tackle is not having access to the
complete route hierarchy when asynchronously loaded lazy routes are
used. React Router provides a route manifest that we can use while
matching parameterized transaction names with routes in all cases except
this lazy-routes pattern.
This problem has been discussed on React Router:
- remix-run/react-router#11113
While this has been
[addressed](remix-run/react-router#11626) for
Remix / React Router (Framework Mode), it's still not available in
Library Mode. The manifest contains the lazily-loaded route, only when
it's navigated to. While waiting for navigation, our transactions can be
dropped for several reasons, such as user behaviour like switching tabs
(`document.hidden` guard), hitting timeouts like `idleTimeout`, and
potentially other reasons. This results in incomplete transaction naming
with leftover wildcards, which caused broken aggregation on the Sentry
dashboard.
The series of attempts to fix this while keeping automatic route
discovery has been prone to race conditions and required special-case
handling of each edge case scenario, also requiring a considerable
amount of internal logic, affecting our readability and performance. At
the end, all failed in giving completely robust and deterministic
results on the customers' side.
This PR proposes a new option: `lazyRouteManifest` specifically for lazy
routes. This will let us have initial information about the route
hierarchy. So we can assign correct parameterized transaction names
without needing to wait for navigated state.
It's a static array of routes in parameterized format (needs to be
maintained by the users on route hierarchy updates) like:
```ts
Sentry.reactRouterV7BrowserTracingIntegration({
// ...
enableAsyncRouteHandlers: true
lazyRouteManifest: [
'/',
'/pricing',
'/features',
'/login',
'/signup',
'/forgot-password',
'/reset-password/:token',
'/org/:orgSlug',
'/org/:orgSlug/dashboard',
'/org/:orgSlug/projects',
'/org/:orgSlug/projects/:projectId',
'/org/:orgSlug/projects/:projectId/settings',
'/org/:orgSlug/projects/:projectId/issues',
'/org/:orgSlug/projects/:projectId/issues/:issueId',
'/org/:orgSlug/team',
'/org/:orgSlug/team/:memberId',
'/org/:orgSlug/settings',
'/org/:orgSlug/billing',
'/admin',
'/admin/users',
'/admin/users/:userId',
'/admin/orgs',
'/admin/orgs/:orgId',
],
})
```
- This will only be active when `enableAsyncRouteHandlers` is set to
`true`
- To match URLs with given routes, we mimic React Router's own
implementation.
- When this is not provided or fails, it falls back to the current
behaviour
- This manifest is primarily for lazy routes, but the users can also add
their non-lazy routes here for convenience or consistency.
- Also added E2E tests that will fail when (if at some point) React
Router manifests include the lazy routes before navigation, so we'll be
aware and plan depending on that manifest instead.
- We can do a cleanup for the race-condition / edge-case handling part
of the code in a follow-up PR.
Closes#19090 (added automatically)
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2 participants

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