fix(desktop): guard shutdown race and kill sidecar process tree

apps/desktop/src/main/index.ts

@@ -2,11 +2,13 @@ import { spawn } from 'node:child_process'
 import { createServer } from 'node:net'
 import { join } from 'node:path'
 import { app, BrowserWindow, shell } from 'electron'
+import killProcessTree from 'tree-kill'
 
 const DEV_SERVER_URL = 'http://localhost:3000'
 
 let mainWindow: BrowserWindow | null = null
 let serverProcess: ReturnType<typeof spawn> | null = null
+let isQuitting = false
 
 const getAvailablePort = (): Promise<number> =>
   new Promise((resolve, reject) => {
@@ -37,7 +39,7 @@ const waitForServer = async (
   timeoutMs = 15_000,
 ): Promise<boolean> => {
   const start = Date.now()
-  while (Date.now() - start < timeoutMs) {
+  while (Date.now() - start < timeoutMs && !isQuitting) {
     if (await isServerReady(url)) return true
     await new Promise<void>((resolve) => setTimeout(resolve, 200))
   }
@@ -56,7 +58,11 @@ const stopServerProcess = () => {
     return
   }
 
-  runningServer.kill()
+  killProcessTree(runningServer.pid, (error?: Error) => {
+    if (error) {
+      console.error('Failed to stop server process:', error)
+    }
+  })
 }
 
 const spawnServer = (port: number): string => {
@@ -84,11 +90,17 @@ const spawnServer = (port: number): string => {
   return `http://127.0.0.1:${port}`
 }
 
-const getServerUrl = async (): Promise<string> => {
+const getServerUrl = async (): Promise<string | null> => {
   if (!app.isPackaged) {
     return DEV_SERVER_URL
   }
+
   const port = await getAvailablePort()
+
+  if (isQuitting) {
+    return null
+  }
+
   return spawnServer(port)
 }
 
@@ -120,9 +132,18 @@ const createWindow = async () => {
   mainWindow.show()
 
   const serverUrl = await getServerUrl()
+  if (!serverUrl || isQuitting || !mainWindow || mainWindow.isDestroyed()) {
+    stopServerProcess()
+    return
+  }
 
   console.log(`Waiting for server at ${serverUrl}...`)
   const ready = await waitForServer(serverUrl)
+  if (isQuitting || !mainWindow || mainWindow.isDestroyed()) {
+    stopServerProcess()
+    return
+  }
+
   if (!ready) {
     console.error(
       app.isPackaged
@@ -144,21 +165,19 @@ app.whenReady().then(createWindow)
 
 app.on('window-all-closed', () => {
   if (process.platform !== 'darwin') {
+    isQuitting = true
     stopServerProcess()
-    if (process.platform === 'win32') {
-      app.exit(0)
-      return
-    }
     app.quit()
   }
 })
 
 app.on('activate', () => {
-  if (BrowserWindow.getAllWindows().length === 0) {
+  if (!isQuitting && BrowserWindow.getAllWindows().length === 0) {
     createWindow()
   }
 })
 
 app.on('before-quit', () => {
+  isQuitting = true
   stopServerProcess()
 })