Modernize node.js to current ECMAScript specifications! node.js will not update their API to ES6+ for a while. This library is a wrapper for various aspects of node.js' API.

Set mz as a dependency and install it.

npm i mz

Then prefix the relevant require()s with mz/:

var fs = require('mz/fs')
fs.exists(__filename).then(function (exists) {
  if (exists) // do something
})

With ES2017, this will allow you to use async functions cleanly with node's core API:

const fs = require('mz/fs')
async function doSomething () {
  if (await fs.exists(__filename)) // do something
}

Many node methods are converted into promises. Any properties that are deprecated or aren't asynchronous will simply be proxied. The modules wrapped are:

• child_process
• crypto
• dns
• fs (uses graceful-fs if available)
• readline
• zlib

var exec = require('mz/child_process').exec
exec('node --version').then(function (stdout) {
  console.log(stdout)
})

mz uses any-promise.

Yes, Node 4.x ships with stable promises support. For older engines, you should probably install your own promise implementation and register it with require('any-promise/register')('bluebird').

Nope, probably slower actually.

Sure. Open an issue.

Currently, the plans are to eventually support:

• New APIs in node.js that are not available in older versions of node
• ECMAScript7 Streams