Name decorator

name_decorator.ts

export const nameKey = Symbol("name");

/**
 * To perserve class name though mangling.
 * @example
 * @name('Customer')
 * class Customer {}
 * @param className
 */
export function name(className: string): ClassDecorator {
  return Reflect.metadata(nameKey, className) as ClassDecorator;
}

/**
 * @example
 * const type = Customer;
 * getName(type); // 'Customer'
 * @param type
 */
export function getName<T extends object>(type: T): string {
  return Reflect.getMetadata(nameKey, type) as string;
}

/**
 * @example
 * const instance = new Customer();
 * getInstanceName(instance); // 'Customer'
 * @param instance
 */
export function getInstanceName(instance: Record<string, unknown>): string {
  return Reflect.getMetadata(nameKey, instance.constructor) as string;
}