Use the modern SASS compiler API

[KaelWD]

Clear and concise description of the problem

sass-loader v12.5 added an option to switch to sass.compileAsync instead of the old sass.render, allowing for use of the new Importer interface which supports @use

https://github.com/webpack-contrib/sass-loader#api

Suggested solution

Either switch to compileAsync (breaking change though) or add a similar option as the webpack plugin for people who need the new API.

Alternative

No response

Additional context

Related: #3180

Validations

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[bluwy]

I think we would be using sass.compileString instead since sass.compile reads from the filesystem. I looked into the types, and it looks like the options for compileString extends from render, so maybe it's not a breaking change if we alternate between compileString and render depending on which API is available.

Related: #6734.

[ygj6]

FYI, I made a simple attempt to support SASS modern API #7170

[danieka]

@ygj @KaelWD @bluwy @sapphi-red You might already have seen this, but sass/sass#3247 was recently resolved and it seems like the speed improvements could be significant. Just as a friendly FYI 😄

[john-easci]

@sapphi-red

Wanted to ref a non-breaking change for this ( #14689 ).

If we allow both legacy and modern modes with a super-simple flag in the config, then it should be a point fix which would be great to get earlier, since it is both a performance and a functionality issue.

[sapphi-red]

Definitely, I forgot why I put the label.

[sapphi-red]

If I understand correctly, the blockers on upstream are all gone and just needs someone to implement it.