`pathToFileURL` function in url fails to handle `\\?\UNC\` Prefix properly

[injunchoi98]

Version

22.5.1

Platform

Microsoft Windows NT 10.0.22631.0 x64

Subsystem

No response

What steps will reproduce the bug?

const { pathToFileURL } = require('url');

console.log(pathToFileURL('\\\\?\\UNC\\server\\share\\folder\\file.txt').href); 
// output: 'file:///UNC/server/share/folder/file.txt'

How often does it reproduce? Is there a required condition?

Anytime

What is the expected behavior? Why is that the expected behavior?

According to the Microsoft documentation on maximum file path limitations, the \?\UNC\ prefix are not used as part of the path itself. so it should be ignored when converting to a file URI. The current implementation does not adhere to this guideline, resulting in incorrect URL conversions. Its output should be file://server/share/folder/file.txt.

What do you see instead?

file:///UNC/server/share/folder/file.txt

Additional information

No response

[avivkeller]

Reproduction:

$ node
Welcome to Node.js v22.5.1.
Type ".help" for more information.
> require('url').pathToFileURL('\\\\?\\UNC\\server\\share\\folder\\file.txt', { windows: false }).href;
'file:///<path>/%5C%5C%3F%5CUNC%5Cserver%5Cshare%5Cfolder%5Cfile.txt'
> require('url').pathToFileURL('\\\\?\\UNC\\server\\share\\folder\\file.txt', { windows: true }).href;
'file:///UNC/server/share/folder/file.txt'