feat: exit after Electron.app exited

Author: caoxiemeihao

scripts/watch.mjs

@@ -24,8 +24,12 @@ function watchMain(server) {
   const startElectron = {
     name: 'electron-main-watcher',
     writeBundle() {
-      electronProcess && electronProcess.kill()
+      if (electronProcess) {
+        electronProcess.removeAllListeners()
+        electronProcess.kill()
+      }
       electronProcess = spawn(electron, ['.'], { stdio: 'inherit', env })
+      electronProcess.once('exit', process.exit)
     },
   }