Running TypeScript with ts-node - Mini Project: Build & Apply

Running TypeScript with ts-node

📖 Scenario: You want to quickly run TypeScript code without compiling it manually. Using ts-node lets you run TypeScript files directly, like running JavaScript with node.This is useful when testing small scripts or learning TypeScript without extra setup.

🎯 Goal: Learn how to write a simple TypeScript file and run it directly using ts-node.

📋 What You'll Learn

Create a TypeScript file with a simple variable and a function

Use ts-node to run the TypeScript file directly

Print output to the console

💡 Why This Matters

🌍 Real World

Developers often want to quickly test TypeScript code snippets without compiling. ts-node helps run TypeScript files directly, speeding up development and learning.

💼 Career

Knowing how to run TypeScript code efficiently is useful for frontend and backend developers working with TypeScript in real projects.

1

Create a TypeScript file with a greeting variable

Create a variable called greeting and set it to the string "Hello from TypeScript!".

Typescript

# Create a variable called greeting and set it to "Hello from TypeScript!"
# Your code here

Need a hint?

Use const greeting: string = "Hello from TypeScript!"; to declare the variable.

2

Add a function to print the greeting

Add a function called printGreeting that takes no parameters and prints the greeting variable using console.log.

Typescript

const greeting: string = "Hello from TypeScript!"

# Add a function called printGreeting that prints greeting
# Your code here

Need a hint?

Define function printGreeting(): void { console.log(greeting); }.

3

Call the function to display the greeting

Call the function printGreeting() to display the greeting message.

Typescript

const greeting: string = "Hello from TypeScript!";

function printGreeting(): void {
    console.log(greeting);
}

# Call printGreeting() below
# Your code here

Need a hint?

Simply write printGreeting(); to call the function.

4

Run the TypeScript file using ts-node

Run the TypeScript file using the command ts-node filename.ts in your terminal to see the output.

Typescript

const greeting: string = "Hello from TypeScript!";

function printGreeting(): void {
    console.log(greeting);
}

printGreeting();

# Run this file with ts-node in your terminal
# Your code here

Need a hint?

Open your terminal and run ts-node filename.ts where filename.ts is your file name.