fix: dont handle sigterm in middleware mode (#8550)

Co-authored-by: patak <matias.capeletto@gmail.com>

packages/vite/src/node/server/index.ts

@@ -299,7 +299,6 @@ export async function createServer(
   const container = await createPluginContainer(config, moduleGraph, watcher)
   const closeHttpServer = createServerCloseFn(httpServer)
 
-  // eslint-disable-next-line prefer-const
   let exitProcess: () => void
 
   const server: ViteDevServer = {
@@ -342,10 +341,11 @@ export async function createServer(
       return startServer(server, port, isRestart)
     },
     async close() {
-      process.off('SIGTERM', exitProcess)
-
-      if (!middlewareMode && process.env.CI !== 'true') {
-        process.stdin.off('end', exitProcess)
+      if (!middlewareMode) {
+        process.off('SIGTERM', exitProcess)
+        if (process.env.CI !== 'true') {
+          process.stdin.off('end', exitProcess)
+        }
       }
 
       await Promise.all([
@@ -382,18 +382,18 @@ export async function createServer(
 
   server.transformIndexHtml = createDevHtmlTransformFn(server)
 
-  exitProcess = async () => {
-    try {
-      await server.close()
-    } finally {
-      process.exit()
+  if (!middlewareMode) {
+    exitProcess = async () => {
+      try {
+        await server.close()
+      } finally {
+        process.exit()
+      }
+    }
+    process.once('SIGTERM', exitProcess)
+    if (process.env.CI !== 'true') {
+      process.stdin.on('end', exitProcess)
     }
-  }
-
-  process.once('SIGTERM', exitProcess)
-
-  if (!middlewareMode && process.env.CI !== 'true') {
-    process.stdin.on('end', exitProcess)
   }
 
   const { packageCache } = config