Support the new module system

[nex3]

See sass/sass#1094

[bradleypeabody]

So, just checking... this page https://sass-lang.com/documentation/at-rules/import says:

The Sass team discourages the continued use of the @import rule. Sass will gradually phase it out over the next few years...

Per this sass/sass#1094 and this https://github.com/orgs/sass/projects/3 the new "module system" isn't quite complete, and yet it seems to be waiting on this issue I'm posting on.

Do we know if this is waiting on some sort of standardization of the module system so it's clear what to do, or is that known and @use just need to be implemented in libsass?

[cpmsmith]

Do we know if this is waiting on some sort of standardization of the module system so it's clear what to do, or is that known and @use just need to be implemented in libsass?

The spec is written, and it's been implemented in dart-sass. Unfortunately, as you can see in #3123, libsass is deprecated, or at least that's the maintainers' stated intention, so there's little hope for this being implemented.

[nex3]

Closing this out because LibSass is now deprecated and we aren't expecting to add any additional features to it.