What/Why/How?

Upgrade vitest and @vitest/coverage-istanbul to 4.0.18 and fix tests that broke after the upgrade.

Tests relying on previous behavior started failing:

• date spies no longer behave the same way (switched to fake timers instead of spying on Date).
• mock call counts are no longer reset automatically between tests (added vi.clearAllMocks() / vi.resetAllMocks() in beforeEach where tests assert call counts, so counts don’t leak between tests).
• constructor mocks must use real functions/classes (replaced arrow functions with function/class declarations).

Reference

• chore(deps): bump minimatch and @vitest/coverage-istanbul #2584
• https://vitest.dev/guide/migration.html

Testing

Screenshots (optional)

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines