TypeScript Installation

TypeScript tutorial

🛠️ TypeScript Installation

Prerequisites

Before TypeScript Installation, make sure you have Node.js installed on your system.

✔ Node.js includes npm (Node Package Manager)
✔ TypeScript is installed using npm

Step 1: Check Node.js Installation

Open Command Prompt / Terminal and run:

node -v
npm -v

If versions appear, Node.js is installed.
If not, download and install Node.js from the official site.

Step 2: Install TypeScript (Global Installation)

Run the following command:

npm install -g typescript

This installs the TypeScript Compiler (tsc) globally.

Step 3: Verify Installation

Check the installed version:

tsc -v

Example output:

Version 5.x.x

Step 4: Create Your First TypeScript File

Create a file named:

app.ts

Add this code:

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

Step 5: Compile TypeScript to JavaScript

Run:

tsc app.ts

This will generate:

app.js

Step 6: Run the JavaScript File

node app.js

Output:

Hello TypeScript

Alternative: Local Installation (Recommended for Projects)

Instead of global installation, you can install TypeScript inside a project.

npm init -y
npm install --save-dev typescript

Run TypeScript using:

npx tsc -v

Create tsconfig.json (Optional but Recommended)

tsc --init

This file controls:

  • Target JavaScript version

  • Strict type checking

  • Module system

  • Output directory

Common Installation Errors & Fixes

❌ tsc is not recognized

✔ Restart terminal
✔ Check npm global path
✔ Reinstall Node.js

❌ Permission Error (Linux/Mac)

sudo npm install -g typescript

Installation Summary

Task Command
Install TypeScript npm install -g typescript
Check Version tsc -v
Compile File tsc file.ts
Initialize Config tsc --init

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