How to write custom decorators in Angular

Decorators are a powerful feature in Angular that can be used to add behavior to classes, methods, and properties. While Angular comes with built-in decorators such as @Component and @Injectable, you can also create your own custom decorators to add additional functionality to your code. In this article, we will go over how to write custom decorators in Angular.

Step 1: Create the decorator

To create a custom decorator in Angular, you can use the @Injectable() decorator provided by Angular. This decorator can be used to create a new decorator that can be applied to classes, methods, or properties. Here’s an example of how to create a custom decorator:

    import { Injectable } from '@angular/core';

    export function CustomDecorator(): ClassDecorator {
      return function(target: Function) {
        // Add your custom logic here
      }
    }
  

Step 2: Use the decorator

Once you have created your custom decorator, you can use it to add behavior to your classes, methods, or properties. Here’s an example of how to use the custom decorator:

    @CustomDecorator()
    export class MyComponent {
      // Add your component logic here
    }
  

Step 3: Add custom logic

Inside the custom decorator function, you can add custom logic to modify the behavior of the class, method, or property it is applied to. This can include adding additional functionality, modifying existing behavior, or performing any other custom actions you need. Here’s an example of how to add custom logic inside the custom decorator:

    export function CustomDecorator(): ClassDecorator {
      return function(target: Function) {
        // Add custom logic here
        console.log('Custom logic added to class');
      }
    }
  

By following these steps, you can create and use custom decorators in Angular to add additional behavior and functionality to your code. Custom decorators can be a powerful tool for adding reusable and customizable behavior to your Angular applications.