test(windows): preload AVA global diagnostics via --import to capture exit/rejections in all workers

Author: johnlindquist

test/_ava-global-diagnostics.mjs

@@ -0,0 +1,63 @@
+// Loaded via AVA nodeArguments --import so it runs in each test process
+const isWindows = process.platform === 'win32'
+if (isWindows) {
+  const pid = process.pid
+  let installed = globalThis.__avaGlobalDiagInstalled
+  if (!installed) {
+    globalThis.__avaGlobalDiagInstalled = true
+
+    const originalExit = process.exit.bind(process)
+    process.exit = (code) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} process.exit called code=${code}`)
+      return originalExit(code)
+    }
+
+    process.on('beforeExit', (code) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} beforeExit code=${code} exitCode=${process.exitCode}`)
+    })
+
+    process.on('exit', (code) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} exit code=${code} exitCode=${process.exitCode}`)
+    })
+
+    process.on('uncaughtException', (err) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} uncaughtException`, err?.stack || String(err))
+    })
+
+    process.on('unhandledRejection', (reason, promise) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} unhandledRejection`, (reason && reason.stack) || String(reason))
+    })
+
+    process.on('warning', (warning) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} warning ${warning.name}: ${warning.message}\n${warning.stack}`)
+    })
+
+    process.on('multipleResolves', (type, promise, value) => {
+      // eslint-disable-next-line no-console
+      console.error(`[ava-diag] pid=${pid} multipleResolves type=${type}`)
+    })
+
+    const getHandles = (process)._getActiveHandles?.bind(process)
+    const getRequests = (process)._getActiveRequests?.bind(process)
+    // Small delay to reduce noise; print snapshot near end of lifecycle
+    setTimeout(() => {
+      try {
+        const handles = getHandles ? getHandles() : []
+        const requests = getRequests ? getRequests() : []
+        // eslint-disable-next-line no-console
+        console.error(
+          `[ava-diag] pid=${pid} snapshot handles=${handles.length} requests=${requests.length} types=${handles.map(h => h?.constructor?.name || typeof h).join(',')}`
+        )
+      } catch {}
+    }, 1000)
+  }
+}
+
+export {}
+

test/ava.config.mjs

@@ -3,7 +3,7 @@ export default {
   extensions: {
     ts: "module",
   },
-  nodeArguments: ["--import=tsx"],
+  nodeArguments: ["--import=tsx", "--import=./test/_ava-global-diagnostics.mjs"],
   environmentVariables: {
     KIT_TEST: "true",
   },