Phase 3: Vitest 4.x Migration

[eoln]

Phase 3: Vitest 4.x Migration

Update Steps

pnpm update vitest -Dw
pnpm test

Migration Checklist

• Check for mock constructor usage with new keyword
• Verify no deprecated config options in vitest.config.mts
• Check for removed reporter APIs

Deprecated Options to Check

// vitest.config.mts - migrate if present:
// - deps.external → server.deps.external
// - deps.inline → server.deps.inline
// - deps.fallbackCJS → server.deps.fallbackCJS

Verification

• pnpm test passes all unit tests
• No deprecation warnings in output

Estimate: 0.33 hours