convert pipe to promise

promisepipe.js

'use strict';
const fs = require('fs');
const co = require('co');
const unzip = require('unzip');
const promisePipe = require("promisepipe");

/*
fs.createReadStream('t.zip')
  .pipe(unzip.Extract({ path: 'output' }).on('close',function (){
    console.log('done');
  }));
  */

  co(function*(){
      let result = yield promisePipe(
      fs.createReadStream('t.zip'),
      unzip.Extract({ path: 'output' })
    )
    var data = fs.readFileSync('output/xx.txt');
    console.log(data);
  })



/*
co(function*(){
  var result = yield x();

})
*/