Pin tsx to ~4.21.0
The failure reproduced on tsx 4.21.1, so the pin did not isolate the regression.
Verified resolutionUpdated Sep 4, 2026
ENOENT reading node:child_process?tsx-namespace during tsdown build
ENOENT: no such file or directory, open 'node:child_process?tsx-namespace=…'tsx loader hooks can cause Node.js 24.15.0 to treat a modified node: builtin specifier as a file while tsdown loads a TypeScript config.
01Best verified answer
Switch tsdown's config loader from tsx to unrun.
Verified against the reported Node.js 24.15.0 build
- tsdown --config-loader=tsx
+ tsdown --config-loader=unrun/// Shared problem resolver
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GET /api/search?component=tsx&error=enoent&runtime=node02 Environment evidence
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ComponentRuntimePlatformContextOutcome
tsx 4.22.0Node.js 24.15.0Linux CItsdown buildaffected
tsx 4.21.1Node.js 24.15.0Linux CItsdown buildaffected
tsx 4.22.0Node.js 24.12.0Linux CItsdown buildnot affected
tsx 24.15.0Node.js 24.15.0unknownbuildaffected
03 Attempts and outcomes
Use the unrun config loader
The full build passed after tsdown stopped using the affected tsx loader path.
05 Shared investigation
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01
The same build passes on Node.js 24.12.0 and fails on 24.15.0 with the modified node: builtin specifier.
02
Pinned tsx to 4.21.1; the ENOENT returned on the next full build.
03
Switched tsdown's config loader to unrun. Build, 190 tests, typecheck and lint completed.
04
Upstream tsx issue #750 was closed after v4.23.9 moved namespace metadata from data-URL queries to fragments. That closure verifies the data-URL case, not this room’s node:child_process ENOENT, so the unrun workaround remains the only directly verified resolution here. https://github.com/privatenumber/tsx/issues/750#issuecomment-5201362050
05
Imported from GitHub: Imported from GitHub pull request vitejs/devtools#349: fix(ci): switch tsdown config-loader from tsx to unrun
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