feat(core): Isolate throwing user callbacks instead of capturing them as events - #23770

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msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

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@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
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}
} 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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

Open
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

Conversation

@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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bugbot run

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
@msonnb

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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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, '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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

Open
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

Conversation

@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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bugbot run

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
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, '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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

Open
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

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@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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bugbot run

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
@msonnb

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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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, '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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

Open
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

Conversation

@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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bugbot run

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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, '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('^' + ".*" + '
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feat(core): Isolate throwing user callbacks instead of capturing them as events - #23770

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ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
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feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

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@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
@msonnb

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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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, '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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

Open
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
Open

feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

Conversation

@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

@linear-code

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
@msonnb

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bugbot run

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

View base workflow run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
@msonnb

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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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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(core): Isolate throwing user callbacks instead of capturing them as events - #23770

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msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks
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feat(core): Isolate throwing user callbacks instead of capturing them as events#23770
msonnb wants to merge 3 commits into
ms/safe-callback-helperfrom
ms/safe-callback-user-callbacks

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@msonnbmsonnb commented Aug 31, 2026

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Wraps beforeSend, beforeSendTransaction, event processors, tracesSampler, beforeBreadcrumb, beforeSendLog and beforeSendMetric in the safeCallback helper from #23760. A throwing or rejecting callback no longer escapes into the calling code and is no longer captured as an internal error event; the event/breadcrumb/log/metric is dropped, a client report is recorded where a category exists, and the error is logged in debug mode.

part of #23755

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JS-3474

@msonnbmsonnb changed the title feat(core)!: Isolate throwing user callbacks instead of capturing them as eventsfeat(core): Isolate throwing user callbacks instead of capturing them as eventsAug 31, 2026
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bugbot run

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github-actionsBot commented Aug 31, 2026

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size-limit report 📦

⚠️Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

PathSize% ChangeChange
@sentry/browser28.71 kB+0.48%+136 B 🔺
@sentry/browser - with treeshaking flags27.02 kB+0.31%+81 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.92 kB+0.33%+86 B 🔺
@sentry/browser (incl. Tracing)49.1 kB+0.48%+234 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)49.1 kB+0.46%+222 B 🔺
@sentry/browser (incl. Tracing, Profiling)52.01 kB+0.42%+213 B 🔺
@sentry/browser (incl. Tracing, Replay)88.58 kB+0.25%+217 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.88 kB+0.16%+118 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.26 kB+0.23%+212 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.21 kB+0.19%+194 B 🔺
@sentry/browser (incl. Feedback)46.2 kB+0.31%+139 B 🔺
@sentry/browser (incl. sendFeedback)33.78 kB+0.42%+139 B 🔺
@sentry/browser (incl. FeedbackAsync)38.87 kB+0.34%+131 B 🔺
@sentry/browser (incl. Metrics)29.68 kB+0.55%+160 B 🔺
@sentry/browser (incl. Logs)29.97 kB+0.53%+156 B 🔺
@sentry/browser (incl. Metrics & Logs)30.61 kB+0.56%+169 B 🔺
@sentry/react30.47 kB+0.53%+158 B 🔺
@sentry/react (incl. Tracing)51.3 kB+0.45%+229 B 🔺
@sentry/vue35.95 kB+0.57%+201 B 🔺
@sentry/vue (incl. Tracing)51.37 kB+0.44%+222 B 🔺
@sentry/svelte28.74 kB+0.48%+135 B 🔺
CDN Bundle30.45 kB+0.31%+93 B 🔺
CDN Bundle (incl. Tracing)49.64 kB+0.25%+121 B 🔺
CDN Bundle (incl. Logs, Metrics)32.69 kB+0.31%+98 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.56 kB+0.27%+136 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.28 kB+0.13%+92 B 🔺
CDN Bundle (incl. Tracing, Replay)87.12 kB+0.13%+113 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.99 kB+0.14%+117 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)93.07 kB+0.15%+138 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)95.01 kB+0.19%+174 B 🔺
CDN Bundle - uncompressed90.19 kB+0.26%+225 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.88 kB+0.21%+305 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.58 kB+0.33%+315 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.66 kB+0.26%+395 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.75 kB+0.14%+315 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.37 kB+0.12%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed273.14 kB+0.15%+395 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed281.07 kB+0.11%+305 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.83 kB+0.14%+395 B 🔺
@sentry/nextjs (client)53.92 kB+0.41%+219 B 🔺
@sentry/sveltekit (client)49.53 kB+0.47%+230 B 🔺
@sentry/core/server40.96 kB+0.53%+212 B 🔺
@sentry/core/browser13.53 kB+0.82%+109 B 🔺
@sentry/node124.1 kB-0.09%-105 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB-0.14%-114 B 🔽
@sentry/node - without tracing88.4 kB+0.14%+121 B 🔺
@sentry/node - without channel injection103.53 kB+0.03%+28 B 🔺
@sentry/aws-serverless96.77 kB+0.14%+128 B 🔺
@sentry/cloudflare (withSentry) - minified201.98 kB+0.59%+1.17 kB 🔺
@sentry/cloudflare (withSentry)502.56 kB+0.56%+2.8 kB 🔺

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 5336fc6. Configure here.

@msonnb
msonnbforce-pushed the ms/safe-callback-user-callbacks branch from 5336fc6 to 4fb6808CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:24
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:24
@msonnb
msonnb requested review from isaacs and mydea and removed request for a teamSeptember 1, 2026 12:24
…m as events
Wraps `beforeSend`, `beforeSendTransaction`, event processors, `tracesSampler`,
`beforeBreadcrumb`, `beforeSendLog` and `beforeSendMetric` in `safeCallback`.
A throwing or rejecting callback now drops the event/breadcrumb/log/metric
(with a client report where one exists) instead of escaping into the calling
code or being captured as an `internal` error event. `tracesSampler` falls back
to the parent sampling decision, then `tracesSampleRate`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
transport: loggingTransport,
});

Sentry.addEventProcessor(() => {

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this could also have a second scenario where we throw in an async event processor?

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yes good idea, added 👍

@mydeamydea left a comment

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overall seems good to me 👍 I wonder if the DEBUG_BUILD flags are worth it, looking at the bundle size (it makes up 50b...), omitting this may actually cut down a tiny but of bundle size for non-tree-shaken builds, but no strong feeling.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Comment threadpackages/core/src/eventProcessors.ts
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I wonder if the DEBUG_BUILD flags are worth it

@mydea hm yes i agree that 50B doesn't seem like a lot. when we add more of these to integrations though, it might end up adding up to a bit more, so I'd slightly lean towards keeping them.

@Lms24Lms24Sep 2, 2026

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l: can we add a test what happens when we set tracesSampleRate: 1 that shows that the span is sent in this case?

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nice!

…Rate fallback
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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3 participants

@msonnb@mydea@Lms24