// require the library
var Multiprogress = require("multi-progress");

// spawn an instance with the optional stream to write to
// use of `new` is optional
var multi = new Multiprogress(process.stderr);

// create a progress bar
var bar = multi.newBar('  downloading [:bar] :percent :etas', {
  complete: '=',
  incomplete: ' ',
  width: 30,
  total: size
});

// `bar` is an instance of ProgressBar
// Use the progressbar API with it