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fix(cloudflare): auto-instrument a re-exported default export - #25345

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@isaacs isaacs commented Oct 14, 2026

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The Vite plugin did not wrap a Worker entry whose default export comes from another module:

export { default } from './handler';
export { handler as default } from './handler';

The transform now imports the handler under a private name, wraps it with withSentry, and exports the wrapper as the default.

The handler may already be wrapped in its own module, which the build cannot see. So the wrap goes through _INTERNAL_wrapUnlessInstrumented, the same guard that class re-exports use. For a handler object, a second withSentry call adds nothing anyway, because each method is patched only once.

@isaacs
isaacs added this pull request to stack #25346 October 14, 2026 03:02
@isaacs
isaacs force-pushed the isaacs/auto-instrument-default-export-re-exported branch from 2f1ee75 to 3dbce98 Compare October 14, 2026 04:03
@isaacs
isaacs marked this pull request as ready for review October 14, 2026 04:03
@isaacs
isaacs requested a review from a team as a code owner October 14, 2026 04:03
@isaacs
isaacs requested review from JPeer264 and mydea and removed request for a team October 14, 2026 04:03

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great catch.

@isaacs
isaacs force-pushed the isaacs/auto-instrument-default-export-re-exported branch from 3dbce98 to 07fff17 Compare October 14, 2026 16:17
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github-actions Bot commented Oct 14, 2026 •

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size-limit report 📦

Path Size % Change Change
@sentry/browser 29.88 kB - -
@sentry/browser - with treeshaking flags 28.02 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 27.92 kB - -
@sentry/browser (incl. Tracing) 52.07 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.08 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.02 kB - -
@sentry/browser (incl. Tracing, Replay) 91.82 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.68 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.55 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.49 kB - -
@sentry/browser (incl. Feedback) 47.4 kB - -
@sentry/browser (incl. sendFeedback) 34.94 kB - -
@sentry/browser (incl. FeedbackAsync) 40.05 kB - -
@sentry/browser (incl. Metrics) 30.9 kB - -
@sentry/browser (incl. Logs) 31.18 kB - -
@sentry/browser (incl. Metrics & Logs) 31.81 kB - -
@sentry/react 31.7 kB - -
@sentry/react (incl. Tracing) 54.39 kB - -
@sentry/vue 38.04 kB - -
@sentry/vue (incl. Tracing) 55.01 kB - -
@sentry/svelte 29.9 kB - -
@sentry/remix (Remix 3 client bundle) 57.09 kB - -
CDN Bundle 31.64 kB - -
CDN Bundle (incl. Tracing) 52.58 kB - -
CDN Bundle (incl. Logs, Metrics) 33.84 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.52 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.77 kB - -
CDN Bundle (incl. Tracing, Replay) 90.25 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.18 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.4 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.34 kB - -
CDN Bundle - uncompressed 93.18 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.03 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 99.72 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 161.99 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 229.76 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.2 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.14 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 289.9 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 295.84 kB - -
@sentry/nextjs (client) 56.8 kB - -
@sentry/sveltekit (client) 52.45 kB - -
@sentry/core/server 41.12 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 152.48 kB +0.02% +17 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 83.81 kB - -
@sentry/node - without tracing 94.61 kB +0.01% +3 B 🔺
@sentry/node - without channel injection 130.7 kB +0.01% +11 B 🔺
@sentry/aws-serverless 102.77 kB +0.01% +5 B 🔺
@sentry/cloudflare (withSentry) - minified 210.6 kB - -
@sentry/cloudflare (withSentry) 522.53 kB - -
@sentry/nextjs/cloudflare (withSentry) - minified 228.27 kB - -

View base workflow run

@isaacs
isaacs force-pushed the isaacs/auto-instrument-default-export-re-exported branch from 07fff17 to 18be570 Compare October 14, 2026 16:41

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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.

Reviewed by Cursor Bugbot for commit 18be570. Configure here.

Comment thread packages/cloudflare/src/vite/transform.ts
@isaacs
isaacs force-pushed the isaacs/auto-instrument-default-export-re-exported branch 2 times, most recently from 475077b to 926eb7e Compare October 14, 2026 18:38
Base automatically changed from isaacschlueter/js-3725-sentrycloudflarevite-auto-instrumentation-skips-the-worker to develop October 14, 2026 23:36
@isaacs
isaacs force-pushed the isaacs/auto-instrument-default-export-re-exported branch from 926eb7e to 89eecb0 Compare October 14, 2026 23:36
The Vite plugin did not wrap a Worker entry whose default export comes
from another module:

```js
export { default } from './handler';
export { handler as default } from './handler';
```

The transform now imports the handler under a private name, wraps it
with `withSentry`, and exports the wrapper as the default.

The handler may already be wrapped in its own module, which the build
cannot see. So the wrap goes through `_INTERNAL_wrapUnlessInstrumented`,
the same guard that class re-exports use. For a handler object, a second
`withSentry` call adds nothing anyway, because each method is patched
only once.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
@JPeer264
JPeer264 force-pushed the isaacs/auto-instrument-default-export-re-exported branch from 89eecb0 to 4d66f93 Compare October 15, 2026 08:45

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2 participants