feat(path/unstable): support URL in first arg of join()

[kt3k]

part of #5537

This PR adds support of URL as the first parameter of join

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.34%. Comparing base (745c4a6) to head (97942c1).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
path/join.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5863      +/-   ##
==========================================
+ Coverage   96.26%   96.34%   +0.07%     
==========================================
  Files         479      479              
  Lines       38705    38674      -31     
  Branches     5617     5631      +14     
==========================================
+ Hits        37259    37260       +1     
+ Misses       1403     1370      -33     
- Partials       43       44       +1     

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[iuioiua]

The first test case looks good. But I'd expect the result of the 2nd test case to be "/../../bar".

[kt3k]

/bar is the normalized form of /../../bar. There's no parent directory of the root directory

[iuioiua]

Oh, I tested with node:path and that does appear to be the case. That doesn't really make sense to me but I guess is fine 🤷🏾‍♂️

[kt3k]

How did you test it? The below prints /bar both in Node.js and Deno

import { join } from "node:path";
console.log(join("/foo", "../../../bar"));

BTW join("file:///foo", "../../../bar") becomes ../bar because "file:///foo" is considered relative path file:/bar (file: part is considered as directory name instead of scheme name)

[iuioiua]

Current tests seem a little bare. Could we please add the tests from the examples?