Vitest 5: Prioritises Performance with a Shared Vite Server, Trace View, and Stricter Test Defaults

Vitest 5.0 focuses on speed, with reported gains of 8 to 25 percent in most setups and up to 53 percent in VM pools. It adds a vitest doctor command, Browser Mode Trace View, and vi.when. Defaults are stricter: clearMocks is true and unawaited async…

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