Jassif Team Institution

npm install -g typescript
npm install --save-dev @types/node

tsc yourfile.ts

npm init -y

npm install --save-dev typescript @types/node

npx tsc --init

// Primitive types
let isDone: boolean = false;
let count: number = 10;
let name: string = 'TypeScript';

// Arrays
let numbers: number[] = [1, 2, 3];
let names: Array = ['Alice', 'Bob'];

// Tuples
let user: [string, number] = ['Alice', 25];

// Enums
enum Color {Red, Green, Blue}
let color: Color = Color.Green;

// Interface interface User {
  id: number;
  name: string;
  email?: string; // Optional property
}

// Type alias
type Point = {
  x: number;
  y: number;
};

// Using the interface
function printUser(user: User) {
  console.log(`User: ${user.name}`);
}

// server.ts
import http from 'http';

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, TypeScript!');
});

const PORT = process.env.PORT || 3000;
server.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

# Install required packages
npm install express
npm install --save-dev @types/express

// app.ts
import express, { Request, Response } from 'express';
interface User {
  id: number;
  name: string;
}
const app = express();
app.use(express.json());
// In-memory database
let users: User[] = [];
// Get all users
app.get('/users', (req: Request, res: Response) => {
  res.json(users);
});
// Add new user
app.post('/users', (req: Request, res: Response) => {
  const user: User = req.body;
  users.push(user);
  res.status(201).json(user);
});
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

{
  "compilerOptions": {
    "target": "es2018",
    "module": "commonjs",
    "outDir": "./dist",
    "rootDir": "./src",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
}