dartsass: Unable to resolve directory paths to directory index files

[jmooring]

Details: https://discourse.gohugo.io/t/51528/15

Applicable to Sass imported as a Hugo module, Hugo is unable to resolve directory paths to directory index files.

For example, this:

@use foo/bar

does not resolve to any of these:

• foo/bar/_index.scss
• foo/bar/_index.sass
• foo/bar/_index.css

This affects both @use and @forward rules. See:

hugo/resources/resource_transformers/tocss/dartsass/transform.go

Line 137 in 28f621d

func (t importResolver) CanonicalizeURL(url string) (string, error) {

Based on experimentation, we should resolve to a file instead of a directory when both exist with same base name:

assets/
└── sass/
    ├── foo/
    │   └── _index.scss
    ├── foo.scss
    └── main.scss    <-- @use "foo";

In the above, we should resolve to foo.scss instead of foo/_index.scss.

[bep]

What is a "index file" and where is the spec?

[jmooring]

https://sass-lang.com/documentation/at-rules/use/#index-files

[jmooring]

To reiterate, the problem is limited to Sass imported as a Hugo module. If the files exist in the OS file system, directory imports work as expected.

[cooperaj]

Thanks for putting my inane forum ramblings together into a bug @jmooring. I really appreciate it. 😄

Was tearing my hair out with this one.