### E-commerce Workflow Integration Example - TypeScript

Source: https://context7.com/upstash/context7test/llms.txt

Demonstrates a complete e-commerce workflow integration using UserService, AuthService, ProductService, and OrderService. This example covers user creation, authentication, product management, order creation, and status updates. It utilizes async/await for asynchronous operations.

```typescript
import { UserService } from './src/user';
import { AuthService } from './src/auth';
import { ProductService } from './src/product';
import { OrderService } from './src/order';

async function main() {
  // Initialize services
  const userService = new UserService();
  const authService = new AuthService();
  const productService = new ProductService();
  const orderService = new OrderService();

  // Create a user and authenticate
  const user = await userService.createUser('jane_doe', 'jane@example.com');
  const token = await authService.login('jane_doe', 'password123');

  // Verify authentication
  if (await authService.verifyToken(token)) {
    // Create products
    const product1 = await productService.createProduct('Laptop Stand', 79.99);
    const product2 = await productService.createProduct('USB Hub', 24.99);

    // Update stock
    await productService.updateStock(product1.id, 50);
    await productService.updateStock(product2.id, 100);

    // Create an order
    const order = await orderService.createOrder(user.id, [
      { productId: product1.id, quantity: 1, price: product1.price },
      { productId: product2.id, quantity: 2, price: product2.price },
    ]);

    // Process the order
    await orderService.updateStatus(order.id, 'processing');
    await orderService.updateStatus(order.id, 'shipped');

    console.log(`Order ${order.id} created with total: $${order.total}`);
  }
}

main().catch(console.error);
```

--------------------------------

### Install Test Refresh Package

Source: https://github.com/upstash/context7test/blob/default-context-test/README.md

Installs the required test-refresh dependency via npm. This command is necessary to include the project services in your environment.

```bash
npm install test-refresh
```

--------------------------------

### Initialize and Use Project Services

Source: https://github.com/upstash/context7test/blob/default-context-test/README.md

Demonstrates how to import and instantiate the User, Auth, Product, and Order services. It shows a typical workflow of creating a user, a product, and placing an order.

```typescript
import { UserService } from './src/user';
import { AuthService } from './src/auth';
import { ProductService } from './src/product';
import { OrderService } from './src/order';

const userService = new UserService();
const productService = new ProductService();
const orderService = new OrderService();

const user = await userService.createUser('john', 'john@example.com');
const product = await productService.createProduct('Widget', 9.99);
const order = await orderService.createOrder(user.id, [{ productId: product.id, price: 9.99, quantity: 2 }]);
```

--------------------------------

### Create Product - ProductService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Creates a new product with a given name and price. It returns a Product object with a unique ID, provided details, and an initial stock of zero. This function is part of the ProductService.

```typescript
import { ProductService, Product } from './src/product';

const productService = new ProductService();

// Create a new product
const product: Product = await productService.createProduct('Wireless Mouse', 29.99);

console.log(product);
// Output:
// {
//   id: 'prod_xyz789',
//   name: 'Wireless Mouse',
//   price: 29.99,
//   stock: 0
// }
```

--------------------------------

### List Products - ProductService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Retrieves all products from the catalog, returning an array of Product objects. It includes details like ID, name, price, and stock levels. This function is part of the ProductService.

```typescript
import { ProductService, Product } from './src/product';

const productService = new ProductService();

// Get all products
const products: Product[] = await productService.listProducts();

console.log(`Total products: ${products.length}`);
products.forEach(product => {
  console.log(`${product.name}: $${product.price} (${product.stock} in stock)`);
});

// Filter products by availability
const inStockProducts = products.filter(p => p.stock > 0);
```

--------------------------------

### Create User - UserService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Creates a new user with the specified username and email. It returns a User object including a unique ID, credentials, and a creation timestamp. This function is part of the UserService.

```typescript
import { UserService, User } from './src/user';

const userService = new UserService();

// Create a new user
const user: User = await userService.createUser('john_doe', 'john@example.com');

console.log(user);
// Output:
// {
//   id: 'abc123xyz',
//   username: 'john_doe',
//   email: 'john@example.com',
//   createdAt: 2024-01-15T10:30:00.000Z
// }
```

--------------------------------

### Create Order with Items - TypeScript

Source: https://context7.com/upstash/context7test/llms.txt

Creates a new order for a user with specified items. It automatically calculates the total price based on product prices and quantities. The function returns an Order object with a 'pending' status. Dependencies include OrderService, Order, and OrderItem interfaces.

```typescript
import { OrderService, Order, OrderItem } from './src/order';

const orderService = new OrderService();

// Define order items
const items: OrderItem[] = [
  { productId: 'prod_001', quantity: 2, price: 29.99 },
  { productId: 'prod_002', quantity: 1, price: 49.99 },
];

// Create the order
const order: Order = await orderService.createOrder('user_abc123', items);

console.log(order);
// Output:
// {
//   id: 'order_xyz789',
//   userId: 'user_abc123',
//   items: [
//     { productId: 'prod_001', quantity: 2, price: 29.99 },
//     { productId: 'prod_002', quantity: 1, price: 49.99 }
//   ],
//   total: 109.97,
//   status: 'pending',
//   createdAt: 2024-01-15T10:30:00.000Z
// }
```

--------------------------------

### Login User - AuthService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Authenticates a user using username and password. It returns an authentication token string for subsequent API requests. This function is part of the AuthService.

```typescript
import { AuthService } from './src/auth';

const authService = new AuthService();

// Authenticate user and get token
const token: string = await authService.login('john_doe', 'securePassword123');

console.log(token);
// Output: 'token-k7x9m2abc'

// Use token in subsequent requests
const headers = {
  'Authorization': `Bearer ${token}`
};
```

--------------------------------

### Update Product Stock - ProductService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Updates the stock quantity for a specific product, useful for inventory management. It can also handle batch updates. This function is part of the ProductService.

```typescript
import { ProductService } from './src/product';

const productService = new ProductService();

// Update product stock
const productId = 'prod_xyz789';
await productService.updateStock(productId, 100);

console.log(`Stock updated for product ${productId}`);

// Batch stock update example
const stockUpdates = [
  { id: 'prod_001', quantity: 50 },
  { id: 'prod_002', quantity: 75 },
  { id: 'prod_003', quantity: 30 },
];

for (const update of stockUpdates) {
  await productService.updateStock(update.id, update.quantity);
}
```

--------------------------------

### Retrieve User Order History - TypeScript

Source: https://context7.com/upstash/context7test/llms.txt

Fetches the complete order history for a given user ID. The orders are returned as an array of Order objects, sorted by their creation date. This is useful for displaying a user's purchase history and calculating total spending. It depends on OrderService and Order interface.

```typescript
import { OrderService, Order } from './src/order';

const orderService = new OrderService();

// Get user's order history
const userId = 'user_abc123';
const orders: Order[] = await orderService.getOrderHistory(userId);

console.log(`User has ${orders.length} orders`);

// Display order summary
orders.forEach(order => {
  console.log(`Order ${order.id}: $${order.total} - ${order.status}`);
});

// Calculate total spent by user
const totalSpent = orders
  .filter(o => o.status !== 'cancelled')
  .reduce((sum, o) => sum + o.total, 0);
console.log(`Total spent: $${totalSpent.toFixed(2)}`);
```

--------------------------------

### Verify Token - AuthService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Validates an authentication token. It returns true if the token is valid and false otherwise, used for protecting routes and validating sessions. This function is part of the AuthService.

```typescript
import { AuthService } from './src/auth';

const authService = new AuthService();

// Verify a token
const token = 'token-k7x9m2abc';
const isValid: boolean = await authService.verifyToken(token);

if (isValid) {
  console.log('Token is valid, proceed with request');
} else {
  console.log('Invalid token, authentication required');
}

// Example middleware usage
async function authMiddleware(token: string): Promise<boolean> {
  const authService = new AuthService();
  return await authService.verifyToken(token);
}
```

--------------------------------

### Find User by ID - UserService (TypeScript)

Source: https://context7.com/upstash/context7test/llms.txt

Retrieves a user by their unique identifier. It returns the User object if found, otherwise null. This function is part of the UserService.

```typescript
import { UserService, User } from './src/user';

const userService = new UserService();

// Look up a user by ID
const user: User | null = await userService.findById('abc123xyz');

if (user) {
  console.log(`Found user: ${user.username}`);
} else {
  console.log('User not found');
}
```

--------------------------------

### Update Order Status - TypeScript

Source: https://context7.com/upstash/context7test/llms.txt

Updates the status of an existing order. This function supports lifecycle management for orders, allowing transitions through statuses like 'pending', 'processing', 'shipped', 'delivered', and 'cancelled'. It requires the OrderService and OrderStatus enum.

```typescript
import { OrderService, OrderStatus } from './src/order';

const orderService = new OrderService();

// Update order status through lifecycle
const orderId = 'order_xyz789';

await orderService.updateStatus(orderId, 'processing');
console.log('Order is being processed');

await orderService.updateStatus(orderId, 'shipped');
console.log('Order has been shipped');

await orderService.updateStatus(orderId, 'delivered');
console.log('Order delivered successfully');

// Handle cancellation
async function cancelOrder(orderId: string): Promise<void> {
  await orderService.updateStatus(orderId, 'cancelled');
  console.log(`Order ${orderId} has been cancelled`);
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.