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feat(bundler-plugins): Enable external source maps and delete them after upload in the esbuild plugin - #25648

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feat/bundler-plugins-delete-sourcemaps-webpackfrom
feat/bundler-plugins-delete-sourcemaps-esbuild

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@timfish

@timfish timfish commented Oct 22, 2026 •

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Part of the stack for #25609. esbuild writes its output before onEnd runs and has no hook to drop an output, so the plugin sets sourcemap: 'external' when the setting is unset and deletes the .map outputs listed in the metafile after a successful upload. When the upload fails the maps stay, with an error log.

The metafile lists outputs relative to absWorkingDir, while the upload globbed them from the process working directory, so builds with an absWorkingDir elsewhere uploaded nothing. The paths are now resolved against absWorkingDir first.

@timfish
timfish added this pull request to stack #25649 October 22, 2026 10:47
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github-actions Bot commented Oct 22, 2026 •

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size-limit report 📦

Compared: be5cd11 (PR test merge using develop at c1db115)

Against: 10056d4 (develop) · base run #63746

⚠️ Baseline mismatch: 8 develop commit(s) in the PR build are missing from the baseline. Their size changes also affect this comparison. Compare commits. Re-run once develop's baseline build for c1db115 finishes.

Path Size % Change Change
@sentry/browser 30.02 kB - -
@sentry/browser - with treeshaking flags 28.16 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 28.06 kB - -
@sentry/browser (incl. Tracing) 52.21 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.22 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.14 kB - -
@sentry/browser (incl. Tracing, Replay) 91.98 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.89 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.72 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.7 kB - -
@sentry/browser (incl. Feedback) 47.58 kB - -
@sentry/browser (incl. sendFeedback) 35.09 kB - -
@sentry/browser (incl. FeedbackAsync) 40.19 kB - -
@sentry/browser (incl. Metrics) 31.04 kB - -
@sentry/browser (incl. Logs) 31.32 kB - -
@sentry/browser (incl. Metrics & Logs) 31.99 kB - -
@sentry/react 31.84 kB - -
@sentry/react (incl. Tracing) 54.52 kB - -
@sentry/vue 38.17 kB - -
@sentry/vue (incl. Tracing) 55.12 kB - -
@sentry/svelte 30.04 kB - -
@sentry/remix (Remix 3 client bundle) 57.24 kB - -
CDN Bundle 31.79 kB - -
CDN Bundle (incl. Tracing) 52.73 kB - -
CDN Bundle (incl. Logs, Metrics) 33.99 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.7 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.96 kB - -
CDN Bundle (incl. Tracing, Replay) 90.45 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.36 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.56 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.53 kB - -
CDN Bundle - uncompressed 93.62 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.47 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 100.17 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 162.44 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 230.39 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.81 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.77 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 290.51 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 296.46 kB - -
@sentry/nextjs (client) 57.42 kB - -
@sentry/sveltekit (client) 52.56 kB - -
@sentry/core/server 43.66 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 154.13 kB +0.01% +13 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.61 kB - -
@sentry/node - without tracing 95.57 kB +0.02% +15 B 🔺
@sentry/node - without channel injection 134.78 kB +0.01% +1 B 🔺
@sentry/aws-serverless 103.73 kB +0.01% +8 B 🔺
@sentry/cloudflare (withSentry) - minified 197.4 kB - -
@sentry/cloudflare (withSentry) 490.4 kB - -
@sentry/nextjs/cloudflare (withSentry) - minified 217.98 kB - -

View base workflow run

@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-esbuild branch from 0d05fc7 to 73fee34 Compare October 22, 2026 10:57
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@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-esbuild branch from 73fee34 to 4040760 Compare October 22, 2026 11:13
@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-esbuild branch 2 times, most recently from 3885821 to 62b848d Compare October 27, 2026 16:25
…ter upload in the esbuild plugin

esbuild writes its output before `onEnd` runs and has no hook to drop
an output, so the maps are deleted from disk after a successful upload
instead. When the upload fails they stay, with an error log.
@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-esbuild branch from 62b848d to f5d5367 Compare October 27, 2026 16:32
@timfish
timfish marked this pull request as ready for review October 27, 2026 18:02

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

Fix All in Cursor

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Reviewed by Cursor Bugbot for commit f5d5367. Configure here.


if (options.sourcemaps?.disable !== 'disable-upload') {
await upload(buildArtifacts);
const { uploaded } = await upload(buildArtifacts);

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Resolved paths break Windows uploads

High Severity

Metafile outputs are now passed through path.resolve before upload. Those platform-native paths go into glob, which still treats \ as an escape unless windowsPathsNoEscape is set, so Windows matches fail. Upload then reports uploaded: false, the new external maps are left on disk, and even previously working sourcemap: true builds stop uploading.

Fix in Cursor Fix in Web

Reviewed by Cursor Bugbot for commit f5d5367. Configure here.

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