fix: remove empty chunk css imports when using esnext (#8345)

Co-authored-by: 翠 / green <[email protected]>

Author: matthewp

Diff for: packages/vite/src/node/plugins/css.ts

@@ -558,8 +558,8 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
           .replace(/\./g, '\\.')
         const emptyChunkRE = new RegExp(
           opts.format === 'es' || opts.format === 'system'
-            ? `\\bimport\\s*"[^"]*(?:${emptyChunkFiles})";\n?`
-            : `\\brequire\\(\\s*"[^"]*(?:${emptyChunkFiles})"\\);\n?`,
+            ? `\\bimport\\s*["'][^"']*(?:${emptyChunkFiles})["'];\n?`
+            : `\\brequire\\(\\s*["'][^"']*(?:${emptyChunkFiles})["']\\);\n?`,
           'g'
         )
         for (const file in bundle) {