properties-util.ts

import { Constructable, EntityBase } from '../odata/common';
import { toStaticPropertyFormat } from './name-converter';

export const nonEnumerable = (target: any, propertyKey: string) => {
  const descriptor = Object.getOwnPropertyDescriptor(target, propertyKey) || {};
  if (descriptor.enumerable !== false) {
    descriptor.enumerable = false;
    descriptor.writable = true;
    Object.defineProperty(target, propertyKey, descriptor);
  }
};

/**
 * Checks if the property with name key of the entity is a navigation property.
 * @param key Name of the property.
 * @param entityConstructor Constructor of the entity.
 * @returns A boolean denoting whether an entity is a navigation property or not.
 */
export function isNavigationProperty<EntityT extends EntityBase>(
  key: keyof EntityT,
  entityConstructor: Constructable<EntityT>
): boolean {
  return (
    '_linkedEntity' in entityConstructor[toStaticPropertyFormat(key as string)]
  );
}