TypeScript Technology & Digital Tools 2

Question 1

Which TypeScript compiler option enables strict null checks to prevent `null` and `undefined` from being assigned to other types?

Accepted Answer

strictNullChecks

Answer

`strictNullChecks` makes `null` and `undefined` distinct types that must be handled explicitly.

Question 2

What does the `tsc --watch` command do in a TypeScript project?

Accepted Answer

Watches files for changes and recompiles automatically

Answer

`tsc --watch` continuously monitors source files and recompiles whenever a change is detected.

Question 3

Which tool is commonly used alongside TypeScript to bundle modules for browser delivery?

Accepted Answer

Webpack

Answer

Webpack is a popular module bundler that processes TypeScript (via loaders) and packages code for browser use.

Question 4

What is the purpose of `ts-node` in a development workflow?

Accepted Answer

It runs TypeScript files directly in Node.js without a separate compile step

Answer

`ts-node` executes TypeScript source directly by compiling it on-the-fly in memory.

Question 5

Which `tsconfig.json` option specifies the ECMAScript target version for the compiled output?

Accepted Answer

target

Answer

The `target` option tells the TypeScript compiler which JavaScript syntax version to emit (e.g., `ES6`, `ES2020`).

TypeScript Practice Test