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test: give each test run its own temporary root - #250
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A run of the unit suite left 64 entries in the system temp directory and the native suite one more; a working machine had accumulated about 5,700. A global setup now creates one root per run, points TMPDIR/TEMP/TMP at it before Vitest starts workers (os.tmpdir() reads them on every call, and workers and their child processes inherit them), and removes it when the run ends. The one remaining directory per run is Vitest's own fetcher root, fixed upstream in 5.0.3.
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Summary
The unit and native test suites no longer leave scratch directories in the system temp directory.
Why
A single run of the unit suite left 64 entries in
os.tmpdir(), from about 17 test files and the CLIs they spawn. The native suite left one more. A working machine had accumulated about 5,700 of them.Changes
tests/support/temp-root.global.ts: a global setup that creates one root per run and pointsTMPDIR/TEMP/TMPat it, removing the root on teardown. Vitest runs global setup before starting workers, andos.tmpdir()reads those variables on every call, so workers and their child processes inherit the root without any per-test changes.vitest.config.tsandtests-native/vitest.config.mts.Notes for reviewers
tmpdir()/<nanoid>/ssr) is created before global setup and never removed in 5.0.0–5.0.2. It is fixed upstream in 5.0.3 (fix(vitest): remove root temp dir on close vitest-dev/vitest#11248), which clears the release cooldown on 2026-10-07.