Nodejs simple es6 'promisify' function

utils.js

/* eslint-disable indent */

/**
 * Create a promise wrapper for function(err, arg1, ...argN)
 * @param {function} fn - Function that should be promisified
 * @returns {function} - Promisified function fn wrapper
 * @example <caption>Example usage of promisify.</caption>
 * const asynFn = require(...) // asynFn((err, a, b) => { ... })
 * const pMyFn = promisify(asynFn)
 * console.log('asynFn result', await pMyfn(1, 2))
 */

const promisify =
  (fn) =>
  (...args) => {
    return new Promise((resolve, reject) => {
      fn(...args, (err, ...args2) => (err ? reject(err) : resolve(...args2)))
    })
  }

module.exports = { promisify }