From fe91a8bcba17762f92935146db9b3a133b47c61d Mon Sep 17 00:00:00 2001
From: Vladimir Sheremet <sleuths.slews0s@icloud.com>
Date: Wed, 10 Dec 2025 16:01:16 +0100
Subject: [PATCH] fix: log deprecated config.poolOptions if it's set

---
 packages/vitest/src/node/config/resolveConfig.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/vitest/src/node/config/resolveConfig.ts b/packages/vitest/src/node/config/resolveConfig.ts
index febc3bcccc10..cc91e3651d8f 100644
--- a/packages/vitest/src/node/config/resolveConfig.ts
+++ b/packages/vitest/src/node/config/resolveConfig.ts
@@ -147,6 +147,10 @@ export function resolveConfig(
     resolved.poolRunner = options.pool
   }
 
+  if ('poolOptions' in resolved) {
+    logger.deprecate('`test.poolOptions` was removed in Vitest 4. All previous `poolOptions` are now top-level options. Please, refer to the migration guide: https://vitest.dev/guide/migration#pool-rework')
+  }
+
   resolved.pool ??= 'forks'
 
   resolved.project = toArray(resolved.project)