feat(tests): add tests for Sass deprecation warnings and file type validation

- Created `import-deprecation-test.vue` to test Sass @import deprecation warnings.
- Created `mixed-decls-fix-test.vue` to test Sass mixed-declarations deprecation warnings.
- Added `file-type-validation.test.ts` to validate file type detection and processing for JavaScript and Vue files.
- Implemented `sass-mixed-decls.test.ts` to ensure Sass compiles without mixed-decls warnings and handles modern features.
- Added `unplugin-filter.test.ts` to test node_modules filtering logic in unplugin.

Author: Simon-He95

package.json

@@ -106,10 +106,10 @@
     "@unocss/core": "^0.50.8",
     "@unocss/preset-uno": "^0.50.8",
     "@vue/babel-plugin-jsx": "^1.4.0",
-    "@vue/compiler-sfc": "^3.5.17",
+    "@vue/compiler-sfc": "^3.5.18",
     "fast-glob": "^3.3.3",
     "node-html-parser": "^7.0.1",
-    "transform-to-unocss-core": "^0.0.68",
+    "transform-to-unocss-core": "^0.0.69",
     "unplugin": "^2.3.5"
   },
   "devDependencies": {

patches/@[email protected]

@@ -12,6 +12,26 @@ export function compilerCss(
   globalCss?: string,
   debug?: boolean,
 ) {
+  // 添加输入验证
+  if (typeof css !== 'string') {
+    if (debug) {
+      console.warn(
+        `[transform-to-unocss] compilerCss received non-string CSS input: ${typeof css}, filepath: ${filepath}`,
+      )
+    }
+    return String(css || '')
+  }
+
+  // 验证语言类型
+  if (!['stylus', 'less', 'scss', 'css'].includes(lang)) {
+    if (debug) {
+      console.warn(
+        `[transform-to-unocss] compilerCss received unknown language: ${lang}, filepath: ${filepath}`,
+      )
+    }
+    return css
+  }
+
   switch (lang) {
     case 'stylus':
       return stylusCompiler(css, filepath, globalCss, debug)