Declarations in Angular

Declarations in Angular

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Declarations in Angular refer to the process of registering components, directives, and pipes within a module so that Angular knows how to instantiate and use them. They essentially declare the building blocks of your Angular application, making them available for use in templates and other components.

Types of Declarations

1. Components: Components are the cornerstone of Angular applications. They are typically defined using the @Component decorator and consist of a TypeScript class and an HTML template.

// Example of a component declaration
import { Component } from '@angular/core';

@Component({
  selector: 'app-example',
  template: '<p>This is an example component.</p>',
  styles: ['p { font-weight: bold; }']
})
export class ExampleComponent {
  // Component logic goes here
}

In this example, ExampleComponent is declared using the @Component decorator with a selector (app-example), template, and styles.

2. Directives: Directives are markers on a DOM element that tell Angular to attach a specific behavior to it. There are two types of directives: structural and attribute directives.

// Example of a directive declaration
import { Directive, ElementRef }…