fix(rsc): remove server style when css import is removed

Author: hi-ogawa

packages/plugin-rsc/examples/basic/src/routes/style-server/server.tsx

@@ -27,3 +27,7 @@ export function TestStyleServer() {
     </div>
   )
 }
+
+// add no-op `import.meta.hot` to trigger `prune` event
+// https://github.com/vitejs/vite/blob/84079a84ad94de4c1ef4f1bdb2ab448ff2c01196/packages/vite/src/node/plugins/importAnalysis.ts#L829-L840
+import.meta.hot

packages/plugin-rsc/src/plugin.ts

@@ -2030,6 +2030,17 @@ function vitePluginRscCss(
     },
     {
       name: 'rsc:importer-resources',
+      configureServer(server) {
+        const hot = server.environments.rsc!.hot
+        const original = hot.send
+        hot.send = function (this, ...args: any[]) {
+          const e = args[0] as vite.PrunePayload
+          if (e && typeof e === 'object' && e.type === 'prune') {
+            console.log('[rsc:prune]', e)
+          }
+          return original.apply(this, args as any)
+        }
+      },
       async transform(code, id) {
         if (!code.includes('import.meta.viteRsc.loadCss')) return