🔷 TypeScript
Learn TypeScript for QA engineers with type basics, advanced patterns, Playwright examples, quizzes and Java comparisons.
Learn TypeScript for modern test automation. From type basics to advanced Playwright patterns — write safer, more maintainable tests with full IDE support, autocomplete, and compile-time error catching.
What you can learn on this page
- Intro & Why TypeScript — TypeScript vs JavaScript TypeScript is a statically typed superset of JavaScript developed by Microsoft. Every valid JavaScript file is also valid TypeScript — you adopt it incrementally without rewriting your entire codebase. TypeScript adds a compile step th
- Installation & Setup — Step 1 — Install Node.js LTS TypeScript runs on Node.js. Always install the LTS (Long-Term Support) release — it is the most stable version and is what CI/CD environments use. Download from https://nodejs.org and choose the 'LTS' button.
- TypeScript Foundations — Simple Types TypeScript is JavaScript with labels attached. Like a box labeled 'numbers only' — if you try to put the wrong thing in, you get an immediate warning. Java already had this; TypeScript brings it to JavaScript.
- Intermediate TypeScript — Aliases & Interfaces A type alias is a shortcut name for a type. An interface is a contract defining what an object must look like. Both look similar but interfaces are extendable — preferred in large projects.
- Advanced TypeScript — Basic Generics A generic is like a fill-in-the-blank template. 'A list' — but a list of what? Numbers? Names? You specify the type later with a type parameter. Same concept as Java's List<T>.
- QA Use Cases — 1. Fully Typed Page Object Model 2. Enums for Environments, Browsers, and Test Status
- Interview Q&A — Basic Questions (1–5) 1. What is the main difference between TypeScript and JavaScript for test automation?
- Practice & Reference — Exercise 1 — Define TestCase Interface Build a TestCase Interface with Enum