Lesson 2: Installing TypeScript and Setting Up the Environment

What You Need

To use TypeScript, you need Node.js and npm. npm allows you to install the TypeScript compiler. A code editor such as Visual Studio Code or Visual Studio 2026 also makes development easier.

Step 1: Install Node.js

Download and install Node.js. After installation, verify that it works:

node -v
npm -v

Step 2: Install TypeScript

Install TypeScript globally so the compiler can be used anywhere:

npm install -g typescript

Then verify the installation:

tsc -v

Step 3: Create a Project Folder

mkdir my_ts_project
cd my_ts_project

Step 4: Create Your First File

let message: string = "Hello, TypeScript!";
console.log(message);

Step 5: Compile the File

tsc app.ts

This generates app.js, which you can run with Node.js:

node app.js

Using tsconfig.json

For bigger projects, create a configuration file:

tsc --init

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "strict": true,
    "outDir": "dist"
  }
}

Summary

You have now installed the TypeScript compiler, created a project folder, and compiled your first file. This environment is enough to continue the tutorial series.