1.11Interview Depth Check

Question 1

Prompt: You join a new team and need to set up your local environment for a test automation project that uses Python and TypeScript. Walk me through your process. What a strong answer should cover:

• Install Python, Node.js, and TypeScript at the correct versions
• Clone the repo and follow setup documentation (or create it if it does not exist)
• Run existing tests to verify the environment works end to end
• Set up VS Code with appropriate extensions and linting Example answer:
• I start by checking the project's README or setup guide for required versions of Python, Node.js, and TypeScript
• I install the correct versions (using pyenv for Python, nvm for Node) and verify with python --version, node --version, tsc --version
• I install project dependencies: pip install -r requirements.txt and npm install
• I run the existing test suite to confirm everything passes on my machine before making any changes
• If setup documentation is missing or outdated, I create it as my first contribution -- this helps the next person and proves I understand the setup

Question 2

Prompt: What is the difference between running a TypeScript file with npx tsx versus compiling it with tsc first? When does it matter? What a strong answer should cover:

• npx tsx runs TypeScript directly without a separate compile step (JIT)
• tsc compiles to JavaScript first, which can be run with node
• For development and testing, tsx is faster and more convenient
• For production and CI, tsc catches all type errors upfront and produces distributable JavaScript
• Node.js 24+ (active LTS) also runs .ts files directly via native type-stripping -- same caveat: it does not type-check Example answer:
• npx tsx hello.ts compiles and runs in one step, which is ideal during development for fast iteration
• Since Node.js 24 (the active LTS as of July 2026), node hello.ts also runs directly thanks to stable native type-stripping -- but like tsx, it does not type-check
• tsc hello.ts produces a JavaScript file that is then run with node hello.js -- two steps, but the compile step catches all type errors across the entire project
• In my workflow, I use tsx for running individual tests and quick experiments, and tsc --noEmit in CI to verify the entire codebase compiles without errors
• The distinction matters because tsx only checks the file being run, while tsc checks the entire project, so CI should always run the full compile check

Question 3

Prompt: A colleague reports that their Python test script works but the same logic fails in TypeScript. How do you help them debug this? What a strong answer should cover:

• Compare syntax differences between the two languages (print vs console.log, indentation vs braces)
• Check for type-specific issues (TypeScript's strict null checks, type narrowing)
• Use the REPL in both languages to isolate the failing expression
• Verify both environments are using the expected language versions Example answer:
• First, I check the error message: a TypeScript compile error (type mismatch) is very different from a runtime error (wrong logic)
• I compare the two implementations side by side looking for language-specific differences: Python's truthiness rules differ from JavaScript's (empty list is falsy in Python but truthy in JS)
• I use the Node REPL and Python REPL to test the specific expression that produces different results
• I verify the TypeScript version and tsconfig settings -- strict mode may catch issues that non-strict mode would ignore