Implement promises.nfcall() without bluebird

Author: mwilliamson

lib/promises.js

@@ -11,8 +11,17 @@ exports.toExternalPromise = toExternalPromise;
 
 exports.nfcall = function(func) {
     var args = Array.prototype.slice.call(arguments, 1);
-    var promisedFunc = bluebird.promisify(func);
-    return promisedFunc.apply(null, args);
+
+    return new Promise(function(resolve, reject) {
+        args.push(function(error, value) {
+            if (error) {
+                reject(error);
+            } else {
+                resolve(value);
+            }
+        });
+        func.apply(null, args);
+    });
 };
 
 function props(obj) {