fix(sveltekit): production server crash from bundled TypeScript compiler#2799
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…ndings The adapter-node chunk patch skipped any chunk matching /\b(const|let|var)\s+__(file|dir)name\b/ — but $ is not a regex word character, so rollup-renamed declarations like `__filename$1` (produced when adapter-node re-bundles the intermediate server output and our banner's declaration collides) satisfied the check. Chunks that declared only a renamed binding while a bundled CJS dependency referenced the bare `__filename` were skipped, and the production server crashed at boot (observed on main with the TypeScript compiler bundled via cosmiconfig through @workflow/world-postgres). Anchor both regexes with (?![\w$]) so renamed identifiers no longer match. Verified: the sveltekit workbench production server now boots and serves health checks (with and without a base path), and queue deliveries from start() succeed. Signed-off-by: Nathan Colosimo <110621881+NathanColosimo@users.noreply.github.com>
Since the world-target injection change, the sveltekit workbench's
hooks.server.ts imports @workflow/world-postgres, whose dependency chain
(graphile-worker -> cosmiconfig) reaches cosmiconfig's TS-config loader.
At runtime that loader's require('typescript') is lazy and never fires,
but SvelteKit bundles the whole chain into the server and rollup's CJS
conversion hoists it into an eager top-level evaluation — executing the
entire TypeScript compiler at boot and crashing the server
("__filename is not defined" inside the bundled compiler).
Alias 'typescript' to a stub module in the SvelteKit plugin, following
the existing pg-native pattern. Server output shrinks from 36MB to 11MB
and boots cleanly.
Verified: sveltekit workbench production build boots, serves
flow?__health (200), and start() runs execute with clean queue
deliveries. The chunk-patch regex fix from the previous commit stays as
hardening for any other CJS dependency that references __filename.
Signed-off-by: Nathan Colosimo <110621881+NathanColosimo@users.noreply.github.com>
🦋 Changeset detectedLatest commit: 5ac4ea7 The changes in this PR will be included in the next version bump. This PR includes changesets to release 16 packages
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📊 Benchmark Results
workflow with no steps💻 Local Development
▲ Production (Vercel)
workflow with 1 step💻 Local Development
▲ Production (Vercel)
workflow with 10 sequential steps💻 Local Development
▲ Production (Vercel)
workflow with 25 sequential steps💻 Local Development
▲ Production (Vercel)
workflow with 50 sequential steps💻 Local Development
▲ Production (Vercel)
Promise.all with 10 concurrent steps💻 Local Development
▲ Production (Vercel)
Promise.all with 25 concurrent steps💻 Local Development
▲ Production (Vercel)
Promise.all with 50 concurrent steps💻 Local Development
▲ Production (Vercel)
Promise.race with 10 concurrent steps💻 Local Development
▲ Production (Vercel)
Promise.race with 25 concurrent steps💻 Local Development
▲ Production (Vercel)
Promise.race with 50 concurrent steps💻 Local Development
▲ Production (Vercel)
workflow with 10 sequential data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
workflow with 25 sequential data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
workflow with 50 sequential data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
workflow with 10 concurrent data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
workflow with 25 concurrent data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
workflow with 50 concurrent data payload steps (10KB)💻 Local Development
▲ Production (Vercel)
Stream Benchmarks (includes TTFB metrics)workflow with stream💻 Local Development
▲ Production (Vercel)
stream pipeline with 5 transform steps (1MB)💻 Local Development
▲ Production (Vercel)
10 parallel streams (1MB each)💻 Local Development
▲ Production (Vercel)
fan-out fan-in 10 streams (1MB each)💻 Local Development
▲ Production (Vercel)
SummaryFastest Framework by WorldWinner determined by most benchmark wins
Fastest World by FrameworkWinner determined by most benchmark wins
Column Definitions
Worlds:
❌ Some benchmark jobs failed:
Check the workflow run for details. |
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🧪 E2E Test Results✅ All tests passed Summary
Details by Category✅ ▲ Vercel Production
✅ 💻 Local Development
✅ 📦 Local Production
✅ 🐘 Local Postgres
✅ 🪟 Windows
✅ 📋 Other
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NathanColosimo
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Jul 7, 2026
…ename bindings" Split into #2799 together with the underlying fix that keeps the TypeScript compiler out of the SvelteKit server bundle — that crash is a main regression independent of base path support. Signed-off-by: Nathan Colosimo <110621881+NathanColosimo@users.noreply.github.com>
Signed-off-by: Peter Wielander <mittgfu@gmail.com>
VaguelySerious
approved these changes
Jul 7, 2026
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No backport to This fix builds entirely on To override, re-run the Backport to stable workflow manually via |
This was referenced Jul 7, 2026
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Description
Fixes the SvelteKit production node server crashing at boot on
main(ReferenceError: __filename is not definedinside bundled TypeScript compiler code inhooks.server-*.js), a regression from the world-target injection change (#2752) adding a@workflow/world-postgresimport to the workbench'shooks.server.ts.Two fixes, both required:
@workflow/world-postgres→graphile-worker→cosmiconfig, whose TS-config loader has arequire('typescript')that is lazy at runtime and never fires — but SvelteKit bundles the whole chain, and rollup's CJS conversion hoists it into an eager top-level evaluation, executing the entire compiler at boot. Thetypescriptmodule is now aliased to a stub in the SvelteKit plugin, following the existingpg-nativestub pattern. Server output shrinks from 36MB to 11MB.patchAdapterNodeServerChunksexists to shim__filenamefor exactly such chunks, but its skip-check/\b(const|let|var)\s+__filename\b/also matches rollup-renamed declarations like__filename$1($is not a regex word character), so it skipped the chunk while the bundled compiler referenced the bare identifier. Both regexes are now anchored with(?![\w$]). Kept as hardening for any other CJS dependency referencing__filename.How did you test your changes?
main:pnpm turbo build --filter @workflow/example-sveltekitthennode workbench/sveltekit/build/index.js→ crashes at boot./.well-known/workflow/v1/flow?__healthreturns 200, astart()through/api/signupcreates a run with clean queue deliveries (noQueue message failedretries in the server log).rg requireTypescript build/server/chunks/confirms the compiler is no longer bundled;build/serverdrops 36MB → 11MB.@workflow/sveltekitand@workflow/builders.PR Checklist - Required to merge
pnpm changesetwas run to create a changelog for this PRgit commit --signoffon your commits)@vercel/workflowin a comment once the PR is ready, and the above checklist is complete