From 757199a661aef26642c0ee4dbfb09b409fd7dbfc Mon Sep 17 00:00:00 2001
From: Vladimir Sheremet <sleuths.slews0s@icloud.com>
Date: Wed, 5 Oct 2022 14:25:40 +0200
Subject: [PATCH] fix: check for asymmetricMatch before accessing

---
 packages/vitest/src/integrations/chai/jest-expect.ts | 2 +-
 packages/vitest/src/integrations/chai/jest-utils.ts  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/vitest/src/integrations/chai/jest-expect.ts b/packages/vitest/src/integrations/chai/jest-expect.ts
index 2498bcde1435..260c4928a69f 100644
--- a/packages/vitest/src/integrations/chai/jest-expect.ts
+++ b/packages/vitest/src/integrations/chai/jest-expect.ts
@@ -548,7 +548,7 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
       )
     }
 
-    if (typeof (expected as any).asymmetricMatch === 'function') {
+    if ('asymmetricMatch' in expected && typeof (expected as any).asymmetricMatch === 'function') {
       const matcher = expected as any as AsymmetricMatcher<any>
       return this.assert(
         thrown && matcher.asymmetricMatch(thrown),
diff --git a/packages/vitest/src/integrations/chai/jest-utils.ts b/packages/vitest/src/integrations/chai/jest-utils.ts
index 24a7a09c263b..66d75641d76c 100644
--- a/packages/vitest/src/integrations/chai/jest-utils.ts
+++ b/packages/vitest/src/integrations/chai/jest-utils.ts
@@ -38,7 +38,7 @@ export function equals(
 const functionToString = Function.prototype.toString
 
 export function isAsymmetric(obj: any) {
-  return !!obj && isA('Function', obj.asymmetricMatch)
+  return !!obj && 'asymmetricMatch' in obj && isA('Function', obj.asymmetricMatch)
 }
 
 export function hasAsymmetric(obj: any, seen = new Set()): boolean {