Installation

Set up TypeScript in your project.

Install TypeScript

npm install -g typescript

# Verify installation
tsc --version

Initialize Project

mkdir my-ts-project
cd my-ts-project
npm init -y
npx tsc --init

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "commonjs",
    "lib": ["ES2020"],
    "outDir": "./dist",
    "rootDir": "./src",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
}

Compile and Run

# Compile TypeScript to JavaScript
tsc

# Or watch mode (auto-recompile)
tsc --watch

# Run compiled JS
node dist/index.js

ts-node (run TS directly)

npm install -D ts-node
npx ts-node src/index.ts