feat(core): Add safeCallback helper for isolating user-provided callbacks - #23760

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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

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Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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, '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" + '
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feat(core): Add safeCallback helper for isolating user-provided callbacks - #23760

Open
msonnb wants to merge 1 commit into
developfrom
ms/safe-callback-helper
Open

feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
msonnb wants to merge 1 commit into
developfrom
ms/safe-callback-helper

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@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Want reviews to match your repository better? Bugbot Learning can learn team-specific rules from PR activity. A team admin can enable Learning in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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): Add safeCallback helper for isolating user-provided callbacks - #23760

Open
msonnb wants to merge 1 commit into
developfrom
ms/safe-callback-helper
Open

feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
msonnb wants to merge 1 commit into
developfrom
ms/safe-callback-helper

Conversation

@msonnb

@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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github-actionsBot commented Aug 31, 2026

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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Reviewed by Cursor Bugbot for commit bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
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Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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('^' + ".*" + '
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feat(core): Add safeCallback helper for isolating user-provided callbacks - #23760

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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Want reviews to match your repository better? Bugbot Learning can learn team-specific rules from PR activity. A team admin can enable Learning in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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" + '
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feat(core): Add safeCallback helper for isolating user-provided callbacks - #23760

Open
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ms/safe-callback-helper
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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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ms/safe-callback-helper

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@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Want reviews to match your repository better? Bugbot Learning can learn team-specific rules from PR activity. A team admin can enable Learning in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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): Add safeCallback helper for isolating user-provided callbacks - #23760

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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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✅ Bugbot reviewed your changes and found no new issues!

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Reviewed by Cursor Bugbot for commit bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
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msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
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Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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('^' + ".*" + '
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feat(core): Add safeCallback helper for isolating user-provided callbacks - #23760

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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
@sentry/browser (incl. Metrics & Logs)30.48 kB+0.15%+45 B 🔺
@sentry/react30.35 kB+0.17%+49 B 🔺
@sentry/react (incl. Tracing)51.12 kB+0.12%+58 B 🔺
@sentry/vue35.77 kB+0.11%+39 B 🔺
@sentry/vue (incl. Tracing)51.17 kB+0.09%+42 B 🔺
@sentry/svelte28.64 kB+0.17%+47 B 🔺
CDN Bundle30.4 kB+0.19%+55 B 🔺
CDN Bundle (incl. Tracing)49.57 kB+0.13%+63 B 🔺
CDN Bundle (incl. Logs, Metrics)32.63 kB+0.16%+52 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)51.46 kB+0.1%+49 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)73.23 kB+0.08%+53 B 🔺
CDN Bundle (incl. Tracing, Replay)87.05 kB+0.06%+50 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)88.91 kB+0.05%+42 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)92.98 kB+0.06%+52 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)94.88 kB+0.07%+59 B 🔺
CDN Bundle - uncompressed90.08 kB+0.15%+132 B 🔺
CDN Bundle (incl. Tracing) - uncompressed147.69 kB+0.09%+132 B 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed96.38 kB+0.14%+132 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed153.38 kB+0.09%+132 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed225.54 kB+0.06%+132 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed267.18 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed272.86 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed280.88 kB+0.05%+132 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed286.55 kB+0.05%+132 B 🔺
@sentry/nextjs (client)53.74 kB+0.12%+61 B 🔺
@sentry/sveltekit (client)49.34 kB+0.11%+54 B 🔺
@sentry/core/server40.77 kB+0.13%+49 B 🔺
@sentry/core/browser13.48 kB+0.4%+53 B 🔺
@sentry/node123.87 kB+0.05%+61 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)81.4 kB--
@sentry/node - without tracing88.16 kB+0.07%+57 B 🔺
@sentry/node - without channel injection103.31 kB+0.07%+64 B 🔺
@sentry/aws-serverless96.52 kB+0.07%+66 B 🔺
@sentry/cloudflare (withSentry) - minified201.38 kB+0.09%+169 B 🔺
@sentry/cloudflare (withSentry)501.16 kB+0.1%+466 B 🔺

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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Want reviews to match your repository better? Bugbot Learning can learn team-specific rules from PR activity. A team admin can enable Learning in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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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): Add safeCallback helper for isolating user-provided callbacks - #23760

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feat(core): Add safeCallback helper for isolating user-provided callbacks#23760
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@msonnbmsonnb commented Aug 31, 2026

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Adds safeCallback(message, fn, fallback) helper which runs a user-provided callback, and on a sync throw or async rejection logs message via debug.error and returns fallback(error) instead of propagating.

applyBeforeSendSpanCallback and the undici safeExecute are refactored onto the helper so there is a single implementation.

First step of #23755, next PR will wrap the rest of the user-defined callbacks.

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size-limit report 📦

PathSize% ChangeChange
@sentry/browser28.61 kB+0.18%+51 B 🔺
@sentry/browser - with treeshaking flags26.98 kB+0.2%+53 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing26.86 kB+0.18%+46 B 🔺
@sentry/browser (incl. Tracing)48.9 kB+0.08%+39 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)48.92 kB+0.11%+52 B 🔺
@sentry/browser (incl. Tracing, Profiling)51.83 kB+0.09%+44 B 🔺
@sentry/browser (incl. Tracing, Replay)88.41 kB+0.08%+64 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags77.79 kB+0.06%+40 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)93.11 kB+0.08%+68 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)106.06 kB+0.05%+52 B 🔺
@sentry/browser (incl. Feedback)46.1 kB+0.12%+54 B 🔺
@sentry/browser (incl. sendFeedback)33.67 kB+0.14%+46 B 🔺
@sentry/browser (incl. FeedbackAsync)38.77 kB+0.12%+46 B 🔺
@sentry/browser (incl. Metrics)29.56 kB+0.18%+51 B 🔺
@sentry/browser (incl. Logs)29.84 kB+0.15%+42 B 🔺
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@msonnbmsonnb changed the title ref(core): Add safeCallback helper for isolating user-provided callbacksfeat(core): Add safeCallback helper for isolating user-provided callbacksAug 31, 2026

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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 bb9a102. Configure here.

return modifiedSpan;
}

if (!hasShownSpanDropWarning) {

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unrelated to this PR, but we can possibly remove this warning (safe some bytes), this has been this way for some time 🤔 or at least make it a debug.warn gated by the debug flag so you can shake it out?

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yeah i think we can remove it tbh. has been like this since v9 and the type doesn't allow it anyway.

@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from bb9a102 to 9792842CompareSeptember 1, 2026 12:17
@msonnb
msonnb marked this pull request as ready for review September 1, 2026 12:20
@msonnb
msonnb requested a review from a team as a code ownerSeptember 1, 2026 12:20
@msonnb
msonnb requested review from Lms24, logaretm and stephanie-anderson and removed request for a team and stephanie-andersonSeptember 1, 2026 12:20

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

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Reviewed by Cursor Bugbot for commit 9792842. Configure here.

Comment threadpackages/core/src/utils/safeCallback.ts

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Had one follow-up suggestion for better tree-shaking but otherwise looks good!

}

function recover<T>(message: string, error: unknown, fallback: (error: unknown) => T): T {
DEBUG_BUILD && debug.error(message, error);

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I think the flag is correct here but the bot review is right: We no longer tree-shake out the actual string passed to this function if DEBUG_BUILD is false. We can still add a ternary to the call-sitest to enable tree shaking, something like

safeCallback(DEBUG_BUILD ? 'full warning/error message' : '',()=>{},()=>{})

…backs
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
@msonnb
msonnbforce-pushed the ms/safe-callback-helper branch from 9792842 to e3f5c00CompareSeptember 1, 2026 12:42
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@msonnb@mydea@Lms24