Repository: nodejs/node
Pull request: url: use resolved path to convert to `fileURL`

Only matters if the CWD is a UNC path, which is hard to write a test for.

Fixes: https://github.com/nodejs/node/issues/56262
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Changed files:
filename: lib/internal/url.js
patch: @@ -1512,32 +1512,35 @@ function fileURLToPath(path, options = kEmptyObject) {
 
 function pathToFileURL(filepath, options = kEmptyObject) {
   const windows = options?.windows ?? isWindows;
-  if (windows && StringPrototypeStartsWith(filepath, '\\\\')) {
+  const isUNC = windows && StringPrototypeStartsWith(filepath, '\\\\');
+  let resolved = isUNC ?
+    filepath :
+    (windows ? path.win32.resolve(filepath) : path.posix.resolve(filepath));
+  if (isUNC || (windows && StringPrototypeStartsWith(resolved, '\\\\'))) {
     // UNC path format: \\server\share\resource
     // Handle extended UNC path and standard UNC path
     // "\\?\UNC\" path prefix should be ignored.
     // Ref: https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
-    const isExtendedUNC = StringPrototypeStartsWith(filepath, '\\\\?\\UNC\\');
+    const isExtendedUNC = StringPrototypeStartsWith(resolved, '\\\\?\\UNC\\');
     const prefixLength = isExtendedUNC ? 8 : 2;
-    const hostnameEndIndex = StringPrototypeIndexOf(filepath, '\\', prefixLength);
+    const hostnameEndIndex = StringPrototypeIndexOf(resolved, '\\', prefixLength);
     if (hostnameEndIndex === -1) {
       throw new ERR_INVALID_ARG_VALUE(
         'path',
-        filepath,
+        resolved,
         'Missing UNC resource path',
       );
     }
     if (hostnameEndIndex === 2) {
       throw new ERR_INVALID_ARG_VALUE(
         'path',
-        filepath,
+        resolved,
         'Empty UNC servername',
       );
     }
-    const hostname = StringPrototypeSlice(filepath, prefixLength, hostnameEndIndex);
-    return new URL(StringPrototypeSlice(filepath, hostnameEndIndex), hostname, kCreateURLFromWindowsPathSymbol);
+    const hostname = StringPrototypeSlice(resolved, prefixLength, hostnameEndIndex);
+    return new URL(StringPrototypeSlice(resolved, hostnameEndIndex), hostname, kCreateURLFromWindowsPathSymbol);
   }
-  let resolved = windows ? path.win32.resolve(filepath) : path.posix.resolve(filepath);
   // path.resolve strips trailing slashes so we must add them back
   const filePathLast = StringPrototypeCharCodeAt(filepath,
                                                  filepath.length - 1);