During September 2025, this developer enhanced the lokalise/shared-ts-libs repository by building an improved Mock Service Worker (MSW) helper that supports query parameters in mock endpoints. Leveraging TypeScript and RequestQuerySchema, they enabled integration tests to specify and validate query string arguments, which increased the reliability and determinism of tests for query-dependent APIs. Their work focused on API mocking and unit testing, allowing teams to simulate more realistic API interactions and reduce production risks. By addressing the need for precise query parameter handling in test environments, they contributed to stronger test coverage and more robust integration testing workflows.