It's not too hard to support both:

function promisify(p, callback) {
  return p.then(function(val) { 
    callback(null, val);
  }, function(reason) {
    callback(reason);
  });
}

function somethingAsync(arg1, arg2, callback) {
  var d = defer();

  // do async stuff

  return callback ? promisify(d.promise, callback) : d.promise;
}

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