Course Overview & Environment Setup

Welcome to TypeScript!

In this first lesson we’ll install Node.js (v20+), npm, and the TypeScript compiler (tsc).

Install Node.js

# macOS / Linux (using Homebrew)
brew install node
# Windows (via Chocolatey)
choco install nodejs

Install TypeScript globally

npm install -g typescript

Verify installation

$ node -v
$ npm -v
$ tsc -v   # should print something like 5.2.x

Create a new project folder and initialize npm:

mkdir ts‑mastery && cd $_
npm init -y

Now add a tsconfig.json – this file tells the compiler how to emit JavaScript:

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "strict": true,
    "outDir": "dist",
    "rootDir": "src",
    "esModuleInterop": true,
    "skipLibCheck": true
  }
}

Create a src folder with a simple index.ts:

// src/index.ts
console.log('👋 Hello, TypeScript!');

Compile and run:

npx tsc   # compiles to ./dist/index.js
node dist/index.js

Tip: Use npx ts-node src/index.ts for rapid prototyping without a build step.