From a1fdd25ba4d226cf092f4bf9aded4ec301c1a0b3 Mon Sep 17 00:00:00 2001
From: Andrew Lauppe <andy@t5tele.com>
Date: Mon, 26 Jan 2026 01:23:26 -0500
Subject: [PATCH] fix(ci): use singleFork on macOS CI to prevent worker crash

The vitest forks pool has a known issue where multiple workers can crash
during teardown on macOS CI runners. Using singleFork=true runs all tests
in a single fork process, avoiding the inter-worker race condition.
---
 vitest.config.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vitest.config.ts b/vitest.config.ts
index 65d65534a..c71c0bbac 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -26,6 +26,10 @@ export default defineConfig({
     // Longer teardown on macOS CI for native module cleanup (node:sqlite, etc.)
     teardownTimeout: macOSCI ? 30_000 : 10_000,
     pool: "forks",
+    // Use single fork on macOS CI to avoid worker crash during teardown
+    poolOptions: macOSCI
+      ? { forks: { singleFork: true } }
+      : undefined,
     maxWorkers: isCI ? ciWorkers : localWorkers,
     include: [
       "src/**/*.test.ts",