/** * User service class for authentication */ export class UserService { /** * Login method */ login(user: string, pass: string): Promise { // implementation } } /** * Config interface for app configuration */ interface Config { apiUrl: string; timeout: number; } /** * Type alias for user */ type User = { id: string; name: string; }; /** * Enum for user status */ enum UserStatus { Active = 1, Inactive = 2, } /** * Arrow function for creating user */ export const createUser = (name: string): User => { return { id: '', name }; }; /** * Constant for max retries */ export const MAX_RETRIES = 3;