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fix(core): Guard loadModule default parameter against ESM scope - #24124

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fix(core): Guard loadModule default parameter against ESM scope#24124
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investigate-loadmodule-es

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@chargome chargome commented Sep 7, 2026

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Guard loadModule's default existingModule parameter with a typeof module check so calling it from the ESM build degrades to undefined instead of throwing ReferenceError: module is not defined, since default parameters are evaluated before the function's try/catch. Fixes #24117

@chargome chargome self-assigned this Sep 7, 2026
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chargome commented Sep 7, 2026

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bugbot 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 0770e69. Configure here.

Default parameters are evaluated before the function body, so the bare `module`
default threw `ReferenceError: module is not defined` from the ESM build before
reaching the try/catch that is meant to make `loadModule` degrade gracefully.
Guard it with a `typeof module` check so ESM callers get `undefined` instead.

Fixes #24117
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
@chargome
chargome force-pushed the investigate-loadmodule-es branch from 8908e3e to c6c97f3 Compare September 7, 2026 07:56
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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.

Path Size % Change Change
@sentry/browser 28.7 kB - -
@sentry/browser - with treeshaking flags 27.01 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 26.9 kB - -
@sentry/browser (incl. Tracing) 49.08 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 49.08 kB - -
@sentry/browser (incl. Tracing, Profiling) 52 kB - -
@sentry/browser (incl. Tracing, Replay) 88.63 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 77.86 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 93.31 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 106.26 kB - -
@sentry/browser (incl. Feedback) 46.19 kB - -
@sentry/browser (incl. sendFeedback) 33.76 kB - -
@sentry/browser (incl. FeedbackAsync) 38.86 kB - -
@sentry/browser (incl. Metrics) 29.67 kB - -
@sentry/browser (incl. Logs) 29.95 kB - -
@sentry/browser (incl. Metrics & Logs) 30.6 kB - -
@sentry/react 30.46 kB - -
@sentry/react (incl. Tracing) 51.29 kB - -
@sentry/vue 35.93 kB - -
@sentry/vue (incl. Tracing) 51.35 kB - -
@sentry/svelte 28.72 kB - -
CDN Bundle 30.44 kB - -
CDN Bundle (incl. Tracing) 49.61 kB - -
CDN Bundle (incl. Logs, Metrics) 32.67 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 51.54 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 73.33 kB - -
CDN Bundle (incl. Tracing, Replay) 87.17 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 89.03 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 93.1 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 95.04 kB - -
CDN Bundle - uncompressed 90.17 kB - -
CDN Bundle (incl. Tracing) - uncompressed 147.84 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 96.55 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 153.62 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 225.86 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 267.48 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 273.25 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 281.18 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 286.94 kB - -
@sentry/nextjs (client) 53.9 kB - -
@sentry/sveltekit (client) 49.52 kB - -
@sentry/core/server 38.5 kB -6.03% -2.47 kB 🔽
@sentry/core/browser 13.53 kB - -
@sentry/node 124.81 kB +0.02% +18 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.51 kB - -
@sentry/node - without tracing 88.51 kB +0.03% +22 B 🔺
@sentry/node - without channel injection 104.12 kB +0.02% +19 B 🔺
@sentry/aws-serverless 96.88 kB +0.03% +21 B 🔺
@sentry/cloudflare (withSentry) - minified 201.59 kB - -
@sentry/cloudflare (withSentry) 501.44 kB +0.01% +8 B 🔺

View base workflow run

@chargome
chargome marked this pull request as ready for review September 7, 2026 08:38
@chargome
chargome requested a review from a team as a code owner September 7, 2026 08:38
@chargome
chargome requested review from isaacs, mydea and timfish and removed request for a team September 7, 2026 08:38
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loadModule throws ReferenceError: module is not defined from the ESM build (default parameter is outside the try/catch)

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