1 files changed, 13 insertions, 23 deletions
diff --git a/lib/path.js b/lib/path.js
index 694cd38425..0a2c0d6bce 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -361,21 +361,13 @@ win32.format = function(pathObject) {
     );
   }
 
-  var root = pathObject.root || '';
-
-  if (typeof root !== 'string') {
-    throw new TypeError(
-        '"pathObject.root" must be a string or undefined, not ' +
-        typeof pathObject.root
-    );
-  }
-
-  var dir = pathObject.dir;
-  var base = pathObject.base || '';
+  var dir = pathObject.dir || pathObject.root;
+  var base = pathObject.base ||
+    ((pathObject.name || '') + (pathObject.ext || ''));
   if (!dir) {
     return base;
   }
-  if (dir[dir.length - 1] === win32.sep) {
+  if (dir === pathObject.root) {
     return dir + base;
   }
   return dir + win32.sep + base;
@@ -570,18 +562,16 @@ posix.format = function(pathObject) {
     );
   }
 
-  var root = pathObject.root || '';
-
-  if (typeof root !== 'string') {
-    throw new TypeError(
-        '"pathObject.root" must be a string or undefined, not ' +
-        typeof pathObject.root
-    );
+  var dir = pathObject.dir || pathObject.root;
+  var base = pathObject.base ||
+    ((pathObject.name || '') + (pathObject.ext || ''));
+  if (!dir) {
+    return base;
   }
-
-  var dir = pathObject.dir ? pathObject.dir + posix.sep : '';
-  var base = pathObject.base || '';
-  return dir + base;
+  if (dir === pathObject.root) {
+    return dir + base;
+  }
+  return dir + posix.sep + base;
 };