Uncaught error with `--experimental-import-meta-resolve`

[ph-fritsche]

Version

22.10

Platform

Linux be964f1f5acb 6.10.4-linuxkit #1 SMP PREEMPT_DYNAMIC Wed Oct  2 16:39:54 UTC 2024 x86_64 Linux

https://hub.docker.com/layers/library/node/22-alpine/images/sha256-c5088ba04c8fcce84e45c9ab8767af401424943a8bfd90ede5a68aefc4f42808

Subsystem

No response

What steps will reproduce the bug?

Run with --experimental-import-meta-resolve:

function resolve(specifier, parentURL) {
    console.log(`\n§ ${parentURL} --> ${specifier}`)
    try {
        console.log(`Resolved: ${import.meta.resolve(specifier, parentURL)}`)
    } catch (e) {
        console.log(`Error: ${e.code}`)
    }
}

resolve('foo', 'file:///bar.js')
resolve('./foo.js', 'http://example.com/bar.js')
resolve('file:///foo.js', 'http://example.com/bar.js')
resolve('foo', 'http://example.com/bar.js')

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

Always reproduces

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

A catchable error that the specifier can't be resolved. This allows to provide a helpful error message that the user should add a custom resolver/loader.

What do you see instead?

§ file:///bar.js --> foo
Error: ERR_MODULE_NOT_FOUND

§ http://example.com/bar.js --> ./foo.js
Resolved: http://example.com/foo.js

§ http://example.com/bar.js --> file:///foo.js
Error: ERR_INVALID_URL_SCHEME

§ http://example.com/bar.js --> foo

  #  node[1799]: static void node::modules::BindingData::GetPackageScopeConfig(const v8::FunctionCallbackInfo<v8::Value>&) at ../src/node_modules.cc:403
  #  Assertion failed: file_url

----- Native stack trace -----

----- JavaScript stack trace -----

1: getPackageScopeConfig (node:internal/modules/package_json_reader:132:33)
2: packageResolve (node:internal/modules/esm/resolve:792:43)
3: moduleResolve (node:internal/modules/esm/resolve:907:18)
4: defaultResolve (node:internal/modules/esm/resolve:1037:11)
5: defaultResolve (node:internal/modules/esm/loader:650:12)
6: #cachedDefaultResolve (node:internal/modules/esm/loader:599:25)
7: #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:615:38)
8: resolveSync (node:internal/modules/esm/loader:632:52)
9: resolve (node:internal/modules/esm/initialize_import_meta:33:25)
10: resolve (file:///workspaces/nodejs-import-meta-resolve/[eval1]:6:46)

Aborted

Additional information

No response

[RedYetiDev]

The assertion is failing because it expects the URL's protocol to be file:, when it is http:

[cedrick-ah]

I would like to work on this. In the function moduleResolve in lib/internal/modules/esm/resolve.js when the protocol of the parsed parentURL is not file the parentURL is returned. Instead of just returning the parentURL, can we do something like this in the function moduleResolve:

  if (resolved.protocol !== 'file:') {
     throw new ERR_INVALID_URL_SCHEME(resolved.protocol);
  }

[RedYetiDev]

No, That wouldn't work. Under the hood, the issue is because it's trying to read the package configuration for the URL, which it can't do. There are cases where a URL can be used, this is not one of them.

[cedrick-ah]

The assertion is failing because it expects the URL's protocol to be file:, when it is http:

According to this, can we then check for the URL protocol in throwIfInvalidParentURL?

[RedYetiDev]

I believe @JakobJingleheimer may know more than I (regarding the package.json reading) (if not, sorry for the ping)

[JakobJingleheimer]

The provided code sample looks like a loader hook. If so, import.meta.resolve() is not available within loaders.