feat: support extension-less Sass imports (#178)

Co-authored-by: kyvg <[email protected]>

Author: mrmckeb

src/helpers/__tests__/fixtures/tsconfig-paths.module.scss

@@ -1,2 +1,2 @@
-@import '@scss/_external.module.scss';
+@import '@scss/_external.module';
 @import 'alias.scss';

src/helpers/getCssExports.ts

@@ -99,7 +99,10 @@ export const getCssExports = ({
 
           const aliasImporter: sass.FileImporter<'sync'> = {
             findFileUrl(url) {
-              const newUrl = matchPath !== null ? matchPath(url) : undefined;
+              const newUrl =
+                matchPath !== null
+                  ? matchPath(url, undefined, undefined, ['.sass', '.scss'])
+                  : undefined;
               return newUrl ? new URL(`file://${newUrl}`) : null;
             },
           };