diff --git a/lib/path.js b/lib/path.js
index 51f62eafa46e53..b43a1ec0eb3372 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -110,6 +110,9 @@ function normalizeString(path, allowAboveRoot, separator, isPathSeparator) {
 }
 
 function _format(sep, pathObject) {
+  if (pathObject === null || typeof pathObject !== 'object') {
+    throw new ERR_INVALID_ARG_TYPE('pathObject', 'Object', pathObject);
+  }
   const dir = pathObject.dir || pathObject.root;
   const base = pathObject.base ||
     `${pathObject.name || ''}${pathObject.ext || ''}`;
@@ -121,16 +124,22 @@ function _format(sep, pathObject) {
 
 const win32 = {
   // path.resolve([from ...], to)
-  resolve: function resolve() {
-    var resolvedDevice = '';
-    var resolvedTail = '';
-    var resolvedAbsolute = false;
+  resolve(...args) {
+    let resolvedDevice = '';
+    let resolvedTail = '';
+    let resolvedAbsolute = false;
 
-    for (var i = arguments.length - 1; i >= -1; i--) {
-      var path;
+    for (var i = args.length - 1; i >= -1; i--) {
+      let path;
       if (i >= 0) {
-        path = arguments[i];
-      } else if (!resolvedDevice) {
+        path = args[i];
+        validateString(path, 'path');
+
+        // Skip empty entries
+        if (path.length === 0) {
+          continue;
+        }
+      } else if (resolvedDevice.length === 0) {
         path = process.cwd();
       } else {
         // Windows has the concept of drive-specific current working
@@ -149,17 +158,10 @@ const win32 = {
         }
       }
 
-      validateString(path, 'path');
-
-      // Skip empty entries
-      if (path.length === 0) {
-        continue;
-      }
-
-      var len = path.length;
-      var rootEnd = 0;
-      var device = '';
-      var isAbsolute = false;
+      const len = path.length;
+      let rootEnd = 0;
+      let device = '';
+      let isAbsolute = false;
       const code = path.charCodeAt(0);
 
       // Try to match a root
@@ -409,16 +411,14 @@ const win32 = {
     if (isPathSeparator(firstPart.charCodeAt(0))) {
       ++slashCount;
       const firstLen = firstPart.length;
-      if (firstLen > 1) {
-        if (isPathSeparator(firstPart.charCodeAt(1))) {
-          ++slashCount;
-          if (firstLen > 2) {
-            if (isPathSeparator(firstPart.charCodeAt(2)))
-              ++slashCount;
-            else {
-              // We matched a UNC path in the first part
-              needsReplace = false;
-            }
+      if (firstLen > 1 && isPathSeparator(firstPart.charCodeAt(1))) {
+        ++slashCount;
+        if (firstLen > 2) {
+          if (isPathSeparator(firstPart.charCodeAt(2)))
+            ++slashCount;
+          else {
+            // We matched a UNC path in the first part
+            needsReplace = false;
           }
         }
       }
@@ -699,16 +699,14 @@ const win32 = {
     // Check for a drive letter prefix so as not to mistake the following
     // path separator as an extra separator at the end of the path that can be
     // disregarded
-    if (path.length >= 2) {
-      const drive = path.charCodeAt(0);
-      if (isWindowsDeviceRoot(drive)) {
-        if (path.charCodeAt(1) === CHAR_COLON)
-          start = 2;
-      }
+    if (path.length >= 2 &&
+        isWindowsDeviceRoot(path.charCodeAt(0)) &&
+        path.charCodeAt(1) === CHAR_COLON) {
+      start = 2;
     }
 
     if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
-      if (ext.length === path.length && ext === path)
+      if (ext === path)
         return '';
       var extIdx = ext.length - 1;
       var firstNonSlashEnd = -1;
@@ -839,16 +837,9 @@ const win32 = {
     return path.slice(startDot, end);
   },
 
+  format: _format.bind(null, '\\'),
 
-  format: function format(pathObject) {
-    if (pathObject === null || typeof pathObject !== 'object') {
-      throw new ERR_INVALID_ARG_TYPE('pathObject', 'Object', pathObject);
-    }
-    return _format('\\', pathObject);
-  },
-
-
-  parse: function parse(path) {
+  parse(path) {
     validateString(path, 'path');
 
     const ret = { root: '', dir: '', base: '', ext: '', name: '' };
@@ -1056,9 +1047,12 @@ const posix = {
     // Normalize the path
     path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator);
 
-    if (path.length === 0 && !isAbsolute)
-      path = '.';
-    if (path.length > 0 && trailingSeparator)
+    if (path.length === 0) {
+      if (isAbsolute)
+        return '/';
+      return trailingSeparator ? './' : '.';
+    }
+    if (trailingSeparator)
       path += '/';
 
     return isAbsolute ? `/${path}` : path;
@@ -1219,7 +1213,7 @@ const posix = {
     var i;
 
     if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
-      if (ext.length === path.length && ext === path)
+      if (ext === path)
         return '';
       var extIdx = ext.length - 1;
       var firstNonSlashEnd = -1;
@@ -1338,16 +1332,9 @@ const posix = {
     return path.slice(startDot, end);
   },
 
+  format: _format.bind(null, '/'),
 
-  format: function format(pathObject) {
-    if (pathObject === null || typeof pathObject !== 'object') {
-      throw new ERR_INVALID_ARG_TYPE('pathObject', 'Object', pathObject);
-    }
-    return _format('/', pathObject);
-  },
-
-
-  parse: function parse(path) {
+  parse(path) {
     validateString(path, 'path');
 
     const ret = { root: '', dir: '', base: '', ext: '', name: '' };