Running TypeScript with ts-node - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is ts-node used for?

ts-node lets you run TypeScript files directly without compiling them first. It runs the code on the fly.

beginner

How do you install ts-node globally?

Use the command npm install -g ts-node to install it globally on your system.

beginner

What command runs a TypeScript file named app.ts using ts-node?

Run ts-node app.ts in your terminal to execute the file directly.

intermediate

Why might you prefer ts-node over compiling with tsc first?

ts-node saves time by skipping the manual compile step. It’s great for quick testing and development.

intermediate

Can ts-node run TypeScript files that use ES modules?

Yes, but you may need to configure your tsconfig.json and use the --esm flag with ts-node.

What does ts-node do?

A Installs TypeScript globally

B Compiles TypeScript to JavaScript only

C Runs TypeScript files directly without pre-compiling

D Converts JavaScript to TypeScript

ts-node runs TypeScript files directly, compiling them on the fly.

Which command installs ts-node locally in a project?

A npm install ts-node

B npm install -g ts-node

C ts-node install

D npm run ts-node

npm install ts-node installs it locally in your project.

How do you run a file named index.ts with ts-node?

A ts-node index.ts

B tsc index.ts

C node index.ts

D npm run index.ts

ts-node index.ts runs the TypeScript file directly.

What flag might you use with ts-node to support ES modules?

A --watch

B --commonjs

C --strict

D --esm

The --esm flag enables ES module support in ts-node.

Why is ts-node useful during development?

A It minifies code automatically

B It skips manual compilation, speeding up testing

C It converts JavaScript to TypeScript

D It only works with JavaScript files

ts-node lets you run TypeScript quickly without compiling first, which speeds up development.

Explain how to run a TypeScript file using ts-node and why it is helpful.

Think about how <code>ts-node</code> saves time compared to compiling first.

Describe the installation steps for ts-node and how to use it in a project.

Consider both installing globally and locally.