A parent URL that ends in / (the working directory) is resolved as a file #862

Node.js resolves --import preloads against the working directory as a directory URL (pathToFileURL(process.cwd() + '/'), so it ends in /), and on the registerHooks() path the entry point too. resolve() in src/lib.rs reads every parent URL as a file and resolves from parent_file.parent(), so a directory parent URL resolves from the directory above it:

let directory = match parent_file {
    Some(parent_file) => parent_file
        .parent()
        .ok_or_else(|| Error::new(Status::GenericFailure, "Parent URL is not a file URL"))?,
    None => cwd.as_path(),
};

This shows up two ways:

1. A relative --import without an extension is not found, because the TypeScript extension probing runs from the wrong directory and Node.js' fallback does not probe .ts. With @oxc-node/core@0.1.7 on Node.js 22.18.0, 24.12.0, and 26.5.0:

   $ cat setup.ts
   const s: string = "setup ran"; console.log(s);
   $ node --import @oxc-node/core/register --import ./setup ./main.ts
   Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/tmp/x/setup' imported from /tmp/x/

   An extensionless import './setup' inside main.ts does find setup.ts, so only the directory parent URL is affected. tsx runs setup.ts in both cases. ts-node's ESM loader rejects both, since it does no extension probing in ESM by default, so oxc-node is the only one where the two disagree.

2. On main (1c23b37), with the working directory at /, file:/// has no parent, so every script fails on the registerHooks() path with Error: Parent URL is not a file URL, for example in a container without WORKDIR or a systemd service. We hit this through Vite+, which vendors 1c23b37 (cd / && vpx /tmp/h.ts on Node.js 24.12.0 and 26.5.0; the module.register() path is not affected). 0.1.7, tsx, and ts-node all run the script.

A parent URL that ends in / is the directory to resolve from. Vite+ works around it for now by passing a file URL inside that directory to createResolve and the original URL to nextResolve.