POM-as-Fixture, and the beforeAll Trap (Playwright + TypeScript, Ch.8)

Chapter 8 focuses on transforming Page Objects into fixtures to eliminate repetitive boilerplate code in UI tests, utilizing the base.extend method. Chapter 10 addresses fixture scoping, contrasting test-scoped fixtures, which are rebuilt for every test, with worker-scoped fixtures, which are created once per worker process. This distinction helps optimize performance for expensive resources that lack per-test state, ensuring framework stability and preventing dependency issues within the Playwright and TypeScript environment.