test: stabilize smoke web server

playwright.smoke.config.ts

@@ -30,7 +30,7 @@ export default defineConfig({
   },
   projects: [{ name: 'chromium', use: { browserName: 'chromium' } }],
   webServer: {
-    command: `pnpm dev --host 127.0.0.1 --port ${port} --strictPort`,
+    command: `node scripts/playwright-smoke-server.mjs ${port}`,
     url: baseURL,
     reuseExistingServer,
     timeout: 30_000,

scripts/playwright-smoke-server.mjs

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+import { spawn } from 'node:child_process'
+
+const port = process.argv[2] ?? process.env.PORT ?? '41741'
+
+const child = spawn(
+  'pnpm',
+  ['dev', '--host', '127.0.0.1', '--port', port, '--strictPort'],
+  {
+    cwd: process.cwd(),
+    env: process.env,
+    stdio: ['pipe', 'inherit', 'inherit'],
+  },
+)
+
+function forwardSignal(signal) {
+  if (child.killed) return
+  child.kill(signal)
+}
+
+process.on('SIGINT', () => forwardSignal('SIGINT'))
+process.on('SIGTERM', () => forwardSignal('SIGTERM'))
+
+child.on('exit', (code, signal) => {
+  if (signal) {
+    process.kill(process.pid, signal)
+    return
+  }
+
+  process.exit(code ?? 1)
+})