From 95049058ae3d3d12f79de596e33fddc8f4bfa23e Mon Sep 17 00:00:00 2001
From: Ivan Demchuk <ivan.demchuk@gmail.com>
Date: Tue, 1 Feb 2022 11:10:09 +0200
Subject: [PATCH] fix: do not mutate options to get api config (#659)

---
 packages/vitest/src/node/plugins/index.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/vitest/src/node/plugins/index.ts b/packages/vitest/src/node/plugins/index.ts
index df49ad210a14..539f7b7c80b2 100644
--- a/packages/vitest/src/node/plugins/index.ts
+++ b/packages/vitest/src/node/plugins/index.ts
@@ -22,8 +22,9 @@ export async function VitestPlugin(options: UserConfig = {}, ctx = new Vitest())
         // preliminary merge of options to be able to create server options for vite
         // however to allow vitest plugins to modify vitest config values
         // this is repeated in configResolved where the config is final
-        const preOptions = deepMerge(options, viteConfig.test || {})
+        const preOptions = deepMerge({}, options, viteConfig.test ?? {})
         preOptions.api = resolveApiConfig(preOptions)
+
         return {
           clearScreen: false,
           resolve: {