A tiny utility to help you copy files:
- Always cleans up file descriptors
 mkdir -psupport- Promise support
 - No half-written files
 - Insusceptible to race conditions, meaning you can do multiple copies fine
 
var cp = require('fs-cp')
// file to file
cp('package.json', 'package2.json').then(function () {
})
// stream to file
cp(res, 'response.json').then(function () {
})