fix(css): respect emitAssets when cssCodeSplit=false

Fixes #15196

Author: lucalooz

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

@@ -953,6 +953,16 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
         return
       }
 
+      // vite:asset cleans up earlier assets of 'renderChunk',
+      // but with cssCodeSplit=false we may still emit CSS here.
+      // So is our responsibility to respect emitAssets
+      if (
+        config.command === 'build' &&
+        !this.environment.config.build.emitAssets
+      ) {
+        return
+      }
+
       // extract as single css bundle if no codesplit
       if (!this.environment.config.build.cssCodeSplit && !hasEmitted) {
         let extractedCss = ''