A unique Angular decorator is created to seamlessly integrate a new component within an existing component

I'm currently experimenting with creating a decorator in Angular that will display a spinner on top of the main component.

Essentially, my main component is making API requests and I want to overlay the decorator on top of the method.

This is how I envision it working:

export function loaderDecorator() {
  return function (target: Object, propertyName: string, descriptor: PropertyDescriptor) {

    const originalMethod = descriptor.value;

    descriptor.value = async function (...args: any) {

        //create a new HttpSpinnerComponent and attach it to the target component

      try {
        const result = await originalMethod.apply(this, args);
        //remove HttpSpinner component
        return result;
      } catch (e) {
        //remove HttpSpinner component
      }
    };
    return descriptor;
  };
}

However, despite searching for solutions, I have yet to find one that works. I am wondering if you might know how I can access the Angular component factory from my decorator, or if there is another way to overlay a spinner component on top of my loading component (I have also tried interceptors and services without success).

Answer №1

Angular Components do not currently allow for the use of custom decorators.

The reason for this limitation is due to a significant conceptual disparity - Angular's compiler aims to transform classes based on their predefined Angular annotations, while custom decorators seek to dynamically alter the structure of these classes at runtime.

Check out this issue for more information

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