Summary & Key Takeaways ​

• Introduces vi.when() for more flexible mocking.
• Adds screenshotDirectory configuration for browser testing.
• Updates @sinonjs/fake-timers to support Temporal API mocking.
• Clears mocks by default before each test, a notable breaking change.
• Changes default output directories for JSON, JUnit, and HTML reporters to .vitest.
• Removes the webdriverio package, streamlining dependencies.
• Hardens UI API access for improved security.
• Includes various bug fixes and stability improvements.

Our Commentary ​

Vitest v5 is shaping up to be a big one. Clearing mocks by default before each test? That's a bold move, but probably the right one for consistency. I'm genuinely curious how the community will adapt to some of these breaking changes. Supporting Temporal API mocking is a nice touch, showing they're keeping pace with modern JS. We're watching this beta closely.