TS Get Started

# In a project directory
npm init -y
npm install -D typescript @types/node
npx tsc --init    # creates tsconfig.json

const name: string = 'world';
console.log(`Hello, ${name}!`);

$ npx tsc hello.ts        # emits hello.js
$ node hello.js
Hello, world!

# Or run directly with tsx (the modern choice):
$ npx tsx hello.ts
Hello, world!

{
  "compilerOptions": {
    "target":           "ES2022",
    "module":           "NodeNext",
    "moduleResolution": "NodeNext",
    "strict":            true,
    "esModuleInterop":   true,
    "skipLibCheck":      true,
    "outDir":            "dist"
  },
  "include": ["src/**/*"]
}

// npm install -g typescript
// tsc hello.ts  -> hello.js
console.log('TypeScript compiled to JavaScript');