Fix sass files resolution for production builds (#246)

Author: simonbrunel

packages/vite-plugin/src/stylesPlugin.ts

@@ -124,7 +124,7 @@ export function stylesPlugin (options: Options): PluginOption {
         context = this
       }
     },
-    async resolveId (source, importer, custom) {
+    async resolveId (source, importer, { custom }) {
       if (
         importer &&
         source.endsWith('.css') &&
@@ -133,7 +133,8 @@ export function stylesPlugin (options: Options): PluginOption {
         if (options.styles === 'none') {
           return '\0__void__'
         } else if (options.styles === 'sass') {
-          return source.replace(/\.css$/, '.sass')
+          const target = source.replace(/\.css$/, '.sass')
+          return this.resolve(target, importer, { skipSelf: true, custom })
         } else if (options.styles === 'expose') {
           awaitResolve()