typedef example

 /**
 * @typedef {object} SpecialType - creates a new type named 'SpecialType'
 * @property {function} save - a function to save
 */
SpecialType.save = function(){
  //
}

/** @return {SpecialType} */
Factory.createSpecialType = function(){
  return SpecialType;
}

/** 
  # once you install tsc, use this
  tsc --allowJs --checkJs --noEmit --moduleResolution node --target ES6 file.js

*/

My findings thus far: https://github.com/BeyondCodeBootcamp/jsdoc-typescript-starter