Function decorator with params

function-decorator-observable.ts

import { Observable } from 'rxjs';

export const ExampleDecorator: () => MethodDecorator = () => (target: unknown, propertyKey: string, descriptor: PropertyDescriptor) => {
  const original: () => Observable<unknown> = descriptor.value;
  descriptor.value = function(): Observable<unknown> {
    try {
      return original.apply(this, arguments).pipe();
    } catch {
      return original.apply(this, arguments);
    }
  };
};