ken-you-code/test-complex.ts

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// Complex TypeScript file for testing
interface User {
  id: number;
  name: string;
  email?: string;
}

class UserManager {
  private users: User[] = [];

  addUser(user: any): void {
    this.users.push(user);
  }

  getUserById(id: number): User | undefined {
    return this.users.find((user) => user.id === id);
  }

  // Async method with proper error handling
  async fetchUserData(userId: number): Promise<User> {
    try {
      const response = await fetch(`/api/users/${userId}`);
      return await response.json();
    } catch (error) {
      throw new Error(`Failed to fetch user: ${error}`);
    }
  }

  // Method with type issues
  processUsers(callback: Function): any {
    return this.users.map(callback);
  }
}

// Function with missing return type
function calculateAge(birthYear) {
  return new Date().getFullYear() - birthYear;
}

// Generic function
function identity<T>(value: T): T {
  return value;
}

export { UserManager, User, calculateAge, identity };