fix(vite): kill prerender child process when the vite preview server closes (#3907)

Author: schiller-manuel

src/build/vite/preview.ts

@@ -79,16 +79,26 @@ export function nitroPreviewPlugin(ctx: NitroPluginContext): VitePlugin {
           PORT: String(randomPort),
         },
       });
+
+      const killChild = (signal: NodeJS.Signals) => {
+        if (child && !child.killed) {
+          child.kill(signal);
+        }
+      };
+
       for (const sig of ["SIGINT", "SIGHUP"] as const) {
         process.once(sig, () => {
           consola.info(`Stopping preview server...`);
-          if (child.killed === false) {
-            child.kill(sig);
-            process.exit();
-          }
+          killChild(sig);
+          process.exit();
         });
       }
-      child.on("exit", (code) => {
+
+      server.httpServer.once("close", () => {
+        killChild("SIGTERM");
+      });
+
+      child.once("exit", (code) => {
         if (code && code !== 0) {
           consola.error(`[nitro] Preview server exited with code ${code}`);
         }