fix(css): loadPreprocessor tolerate require.resolve.paths not exists (#4853)

Author: antfu

packages/vite/src/node/plugins/css.ts

@@ -989,7 +989,7 @@ function loadPreprocessor(lang: PreprocessLang, root: string): any {
   try {
     // Search for the preprocessor in the root directory first, and fall back
     // to the default require paths.
-    const fallbackPaths = require.resolve.paths(lang) || []
+    const fallbackPaths = require.resolve.paths?.(lang) || []
     const resolved = require.resolve(lang, { paths: [root, ...fallbackPaths] })
     return (loadedPreprocessors[lang] = require(resolved))
   } catch (e) {