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feat(bundler-plugins): Add sourcemaps.deleteSourcemapsAfterUpload and staged uploads - #25637

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@timfish

@timfish timfish commented Oct 22, 2026

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First of a stack that lets the bundler plugins handle source maps without any user configuration (#25609). Today a user has to set the bundler's source map mode to hidden and write filesToDeleteAfterUpload globs, and wrong globs leave maps in production or delete files that were never uploaded. The follow-up PRs wire each bundler plugin to the pieces added here; this one changes no build output.

The new sourcemaps.deleteSourcemapsAfterUpload option defaults to "auto": the plugin removes source maps only when it turned them on itself, true also removes maps the user enabled, and false keeps the plugin from changing or warning about the user's setting at all. A small decision helper maps the user's source map setting onto "enable hidden maps" and "delete after upload", and warns when maps are turned off or inlined. The option also lands on the shared SourceMapsOptions type in core, so the framework SDKs can expose it later.

The plugin manager gains an upload staging folder that a bundler plugin fills from its pre-write hook with each chunk and its map, before the bundler drops the map from its output. uploadSourcemaps uploads the staging folder together with whatever it finds on disk, in the prepared mode and in the direct prepareArtifacts: false mode alike, keeps the folder with an error log when the upload fails since it holds the only copy of the maps, and now reports whether it uploaded anything.

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size-limit report 📦

Compared: 6bf0d3e (PR test merge using develop at 10056d4)

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

✅ Baseline matches: this diff contains only this PR's changes.

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% +12 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% +3 B 🔺
@sentry/aws-serverless 103.73 kB +0.01% +7 B 🔺
@sentry/cloudflare (withSentry) - minified 197.4 kB - -
@sentry/cloudflare (withSentry) 490.4 kB - -
@sentry/nextjs/cloudflare (withSentry) - minified 217.98 kB - -

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@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-after-upload branch from 04eb117 to 1e975bd Compare October 22, 2026 10:45
@timfish
timfish added this pull request to stack #25649 October 22, 2026 10:47
@timfish
timfish marked this pull request as ready for review October 22, 2026 10:51
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@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-after-upload branch from 1e975bd to 1c26acc Compare October 22, 2026 11:49
@timfish
timfish requested review from JPeer264 and isaacs October 22, 2026 11:59
…nd staged uploads

Adds the option, a decision helper that maps the user's source map
setting to enable and delete choices, and an upload staging folder on
the build plugin manager that bundler plugins can fill from their
pre-write hooks. No bundler plugin uses it yet, so build output does
not change.
@timfish
timfish force-pushed the feat/bundler-plugins-delete-sourcemaps-after-upload branch from 1c26acc to 4c367d6 Compare October 27, 2026 16:20

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