Promisify modules as you require them.
var qequire = require('qequire');
var fs = qequire('fs');
// methods on fs return promises
// how crazy is that?
fs.readFile('foo.txt').finally(console.log);
Warning: probably breaks stuff.
Promises are useful when you have a chain of async tasks and want predictable error handling.
Q provides some nice helpers. If you only want to wrap some APIs, you might want to check them out.
MIT