chore: migrate to Vitest 5 and fix toolchain blockers

[fengmk2]

The old benchmark API blocks vp migrate from installing vitest@5.0.1. Benchmarks now use the bench fixture inside test() and run through vp run bench in development and CI.

The toolchain uses the Vite+ preview build 0.0.0-commit.26a6dfe55eadd10931a3f7c38d30a900292ffeed and its registry bridge. Development and CI select supported Node.js versions while the library keeps its public engines.node range. The configuration sets clearMocks: false to preserve existing mock behavior. All setup-vp steps set sfw: false to disable Socket Firewall during dependency installation.

The consumer fixture scripts now compile and execute each fixture instead of rebuilding the root package. Their configurations support typescript@7, and the .mts fixture no longer expects a valid import to fail. The root configurations exclude test/mts, which requires the built package. CI runs vp run build:test to compile and execute the consumer fixtures after the package build.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​vitest/​coverage-v8@​4.1.11 ⏵ 5.0.1			+1	-1
	vitest@​4.1.11 ⏵ 5.0.1	+1		+1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.24%. Comparing base (776a8da) to head (dcc067b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   94.24%   94.24%           
=======================================
  Files          10       10           
  Lines         747      747           
  Branches      235      235           
=======================================
  Hits          704      704           
  Misses         40       40           
  Partials        3        3           

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[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/node-modules/urllib@902

commit: dcc067b

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/node-modules/urllib@902

commit: 0f692e0

[fengmk2]

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