Generating Components, Services, and Modules using Angular CLI

This tool is a component of the Angular ecosystem and is intended to function in tandem with Angular applications. Angular Course may dramatically increase your productivity whether you are beginning a new project or maintaining an old one. Before learning how to generate Components, Services, and Modules using Angular CLI, we’ll first discuss What is Angular CLI.  

Angular CLI is a command-line interface used to create, build, test, and deploy Angular applications. It offers developers a simplified and efficient workflow by automating various operations that would otherwise be time-consuming and error-prone.  

Table of Contents

• Creating Components with Angular CLI
• Creating Services with Angular CLI
• The Role of Services in Angular CLI
• Injecting Services into Components
• Creating Modules with Angular CLI
• Organizing Components and Services within Modules
• Generating Guards
• Best Practices for Using Angular CLI
• Conclusion

Creating Components with Angular CLI

Open your command prompt or terminal and go to the directory of your Angular project to begin generating a new component using Angular CLI. Next, execute the subsequent command:

Replace the component name with your preferred component name. Angular CLI will produce all of the files and directories required for your component, such as TypeScript files for the component logic, an HTML template for the view, a CSS file for style, and more.

Creating Services with Angular CLI

To create a new service using Angular CLI, launch a command line or terminal and go to the directory of your Angular project. Next, execute the subsequent command:

Replace service-name with the name you want for your service. It will generate the required files and configure the service for you.

The Role of Services in Angular CLI

There is just one instance of each service throughout the entire application because Angular services are singletons. Thanks to this attribute, they are perfect for handling basic functions like HTTP requests, authentication, and more or for managing data that needs to be shared between many components.  

Services encourage modularity and maintainability by encapsulating particular tasks and separating them from components. As a best practice for Angular development, this separation of concerns keeps your codebase tidy and well-organised.

Injecting Services into Components

You can inject a service into your components once you’ve created it. The dependency injection system in Angular allows you to deliver services to components that require them. You may then access the service’s methods and data using your component.

Angular CLI also assists with this by adding the required import statements and configuring the service to be injectable. All you have to do is import the service and add it as a provider to the metadata of your component.

You can guarantee uniformity in the creation and organisation of services throughout your project by using Angular CLI for service generation. This consistency facilitates code quality, saves time, and facilitates comprehension and interaction between engineers and your code.

Creating Modules with Angular CLI

Using Angular CLI, create a new module by executing this command in your project directory via terminal or command prompt:

Change module-name to the name you choose for your module. The required files will be generated, and the module will be configured using Angular CLI.  

Organizing Components and Services within Modules

You can organise your components and services within a module after you’ve developed it. This is accomplished by including them in the module’s metadata. Here’s an example of how to declare modules’ components and services:

Generating Guards

Guards are a crucial part of Angular’s routing system, used to control access to specific routes in your application. Angular CLI simplifies the creation of guards with the following command:

This command creates a guard file with predefined methods such as canActivate and canActivateChild, which allows you to write custom logic to decide if a user can access a certain route.

Best Practices for Using Angular CLI

Organise components, services, and modules into specific directories to promote clarity and simplicity of use. A well-structured folder hierarchy is crucial. Create shared modules to avoid code duplication and feature modules to group relevant functionalities together. Adopt PascalCase for class names, kebab-case for components and services, and consistent file naming practises. Component selectors should be brief but relevant. Lastly, prioritise code reuse by creating services and components that you may use in other areas of your program.

Conclusion

Angular CLI’s straightforward commands have let us easily develop components, services, and modules along this journey. Components are the building parts of your application’s user interface, whereas services manage data and logic, and modules organise your codebase. The ability to build these critical parts using Angular CLI improves your productivity as well as code maintainability.  

We looked at sophisticated commands like generating guards and pipes, establishing routing, and running unit tests to show how Angular CLI enables developers to easily tackle complicated tasks. These advanced functionalities are essential for developing strong, high-quality Angular apps.