How to use util.promisify

const unzipFile = async function({ path }) {
 const zip = new AdmZip(path)
 const pExtractAll = promisify(zip.extractAllToAsync.bind(zip))
 await pExtractAll(`${path}/..`, false)
}

// End zipping files
const endZip = async function(archive, output) {
 archive.finalize()
 await pEndOfStream(output)
}

promisify(function fire (opts, cb) {
 assert(typeof opts.procedure === 'string', 'Procedure must be a string')
 cb = cb || noop

 if (!this.isReady) {
  debug('client not ready yet, wait for connect')
  this.once('connect', () => {
   debug('fire', opts)
   this._client.fire(opts, cb)
  })
  return
 }

 debug('fire', opts)
 this._client.fire(opts, cb)
})

promisify(function invoke (opts, cb) {
 assert(typeof opts.procedure === 'string', 'Procedure must be a string')

 if (!this.isReady) {
  debug('client not ready yet, wait for connect')
  this.once('connect', () => {
   debug('invoke', opts)
   this._client.request(opts, cb)
  })
  return
 }

 debug('invoke', opts)
 this._client.request(opts, cb)
})