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decorator in javascript

function excludeProperties(propertiesToExclude: string[]) {
  return (target: any, propertyName: string, descriptor: PropertyDescriptor) => {
    const originalFunction = descriptor.value;
    descriptor.value = async function(...args: any[]) {
      const originalResult = await originalFunction.apply(this, args);
      propertiesToExclude.forEach(propertyName => {
        delete originalResult[propertyName];
      return originalResult;

import userModel from './user.model';
import UserNotFoundException from './UserNotFoundException';
import excludeProperties from './excludeProperties';
class UserService {
  private user = userModel;
  private getUser = async (userId: string) => {
    const user = await this.user.findById(userId);
    if (user) {
      return user;
    throw new UserNotFoundException(userId);


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