Angular Module Implementation Challenge

This challenge focuses on building a foundational Angular module. Understanding how to organize your Angular application into modules is crucial for maintainability, reusability, and efficient loading of your code. You will create a simple module that encapsulates a specific feature, demonstrating your grasp of Angular's modular architecture.

Problem Description

Your task is to create a new Angular module named UserModule. This module should be designed to manage all components, services, and other related artifacts for a user-related feature within a larger Angular application.

Key Requirements:

1. Module Creation: Create a new TypeScript file (e.g., user.module.ts) that defines an Angular module using the @NgModule decorator.
2. Declarations: The UserModule should declare a simple UserListComponent (you will need to create a placeholder for this component).
3. Imports: The UserModule should import CommonModule from @angular/common, as it's likely to use directives like *ngIf and *ngFor within its components.
4. Exports: The UserModule should export the UserListComponent so that other modules can import and use it.
5. AppModule Integration (Conceptual): While you won't have a full application to integrate into, understand where UserModule would be imported in the AppModule (e.g., in the imports array). For this challenge, simply assume it will be imported elsewhere.
6. Placeholder Component: Create a basic UserListComponent (e.g., user-list.component.ts) with a minimal template. It doesn't need complex functionality, just enough to be declared and exported.

Expected Behavior:

The UserModule should be a self-contained unit that can be imported by other modules. The UserListComponent declared within it should be available for use by any module that imports UserModule.

Edge Cases to Consider:

• Circular Dependencies: While not directly testable in this isolated challenge, be mindful of how modules depend on each other to avoid circular dependencies.
• Module Granularity: Consider what makes a good candidate for a separate module (e.g., a feature like "users," "products," "authentication").

Examples

Example 1: user.module.ts Structure

// src/app/user/user.module.ts
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { UserListComponent } from './user-list.component'; // Assuming this path

@NgModule({
  declarations: [
    UserListComponent
  ],
  imports: [
    CommonModule
  ],
  exports: [
    UserListComponent
  ]
})
export class UserModule { }

Explanation: This code snippet shows the basic structure of the UserModule. It imports necessary Angular modules, declares its own components, and exports a specific component for external use.

Example 2: user-list.component.ts Structure

// src/app/user/user-list.component.ts
import { Component } from '@angular/core';

@Component({
  selector: 'app-user-list',
  template: `
    <h2>User List</h2>
    <p>This is the user list component.</p>
  `
})
export class UserListComponent { }

Explanation: This is a minimal Angular component that will be declared and exported by the UserModule.

Constraints

• The solution must be written in TypeScript.
• You must use the @NgModule decorator for module definition.
• You must import CommonModule.
• The module name must be UserModule.
• The component name must be UserListComponent.

Notes

• Think about the purpose of declarations, imports, and exports within an @NgModule.
• declarations are for components, directives, and pipes that belong to this module.
• imports are for other modules whose exported components, directives, or pipes are needed by components in this module.
• exports are for components, directives, or pipes that should be available to components in other modules that import this module.
• For this challenge, you can assume the necessary Angular CLI setup and file structure are in place. Focus on the content of user.module.ts and user-list.component.ts.