I'm looking for a way to get an object's property names as a type using JSDoc.

Let there be a typedef of an object named Record

/**
 * @typedef {{
      date: string,
      a1: string,
      a2: string,
   }} Record
 */

I want the variable fields to be documented as equal to the object's properties- which means for this example: 'date' | 'a1' | 'a2'

/**
 * @type {*keyof Record??*} in this case, this will be equal to @type {'date' | 'a1' | 'a2'}
 */
let fields = 'a1';

Typescript provides the keyof keyword, which does just that. unfortunately, the system I'm working on does not support typescript :\