SCSS modules

[wongjn]

Dart Sass 1.23.0 dropped recently and with it, a new module system.

This pull request adds parsing for:

• @use
• @forward
• module.$variables
• module.functions()
• @include module.includes

Related to microsoft/vscode#81943.

[msftclas]

All CLA requirements met.

[CarterPape]

thank you for this

[octref]

Very high quality work! Just some nitpicks.

While you are on it, maybe update findDocumentLinks of scssNavigation.ts as well? Currently the paths are not linked so you cannot cmd+click into them.

[wongjn]

Done.

---

Separately while working on this, I noticed some things that I think are out of scope for this pull request:

src/test/scss/scssNavigation.test.ts:53:

 					if (stats.isFile()) {
 						type = FileType.File;
-					} else if (stats.isDirectory) {
+					} else if (stats.isDirectory()) {
 						type = FileType.Directory;
-					} else if (stats.isSymbolicLink) {
+					} else if (stats.isSymbolicLink()) {
 						type = FileType.SymbolicLink;
 					}

Typescript threw some errors here, saying that these were probably meant to be method calls.

src/services/cssNavigation.ts:14

-import { endsWith, startsWith } from '../utils/strings';
+import { startsWith } from '../utils/strings';

endsWith is unused.

src/services/scssNavigation.ts:24

-	public findDocumentLinks(
-		document: TextDocument,
-		stylesheet: nodes.Stylesheet,
-		documentContext: DocumentContext
-	): DocumentLink[] {
-		return super.findDocumentLinks(document, stylesheet, documentContext);
-	}

I don't believe this method override is needed if it is only calling super.

[octref]

Thanks again, I fixed them up with
3ebd684