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JavaScript and TypeScript for QA
2.1OverviewJavaScript dominates frontend testing, and TypeScript adds the type safety that large test suites need. If the application under test is…2.2Why JavaScript/TypeScript for QATypeScript catches errors at compile time that would otherwise become flaky tests at runtime:2.3Jest: Unit and Integration TestingJest is the most popular JavaScript test framework. It is commonly used for unit tests, API tests, and component tests.2.4Playwright Test: E2E TestingPlaywright Test is the modern standard for end-to-end browser testing in the JS/TS ecosystem.2.5Cypress: Component and E2E TestingCypress runs in the browser alongside your application, giving it unique capabilities for frontend testing.2.6Package Management2.7TypeScript Configuration for Test ProjectsAs of July 2026, Node.js 24 is the active LTS release, and its native TypeScript type-stripping is stable: node app.ts just runs, no…2.8Choosing Between Frameworks2.9Practical Exercise1. Create a Playwright Test project that tests a public website (e.g., https://demo.playwright.dev/todomvc/) 2. Write tests for: adding a…2.10Key Takeaways- TypeScript adds type safety that catches test bugs at compile time - Node.js 24 LTS runs .ts files directly via type-stripping -- but it…