fix(expect): use Array.isArray to check if an array is an Array

Author: G-Rath

CHANGELOG.md

@@ -43,6 +43,7 @@
 - `[babel-plugin-jest-hoist]` Use `denylist` instead of the deprecated `blacklist` for Babel 8 support ([#14109](https://github.com/jestjs/jest/pull/14109))
 - `[expect]` Check error instance type for `toThrow/toThrowError` ([#14576](https://github.com/jestjs/jest/pull/14576))
 - `[expect]` Improve diff for failing `expect.objectContaining` ([#15038](https://github.com/jestjs/jest/pull/15038))
+- `[expect]` Use `Array.isArray` to check if an array is an `Array` ([#15101](https://github.com/jestjs/jest/pull/15101))
 - `[jest-changed-files]` Print underlying errors when VCS commands fail ([#15052](https://github.com/jestjs/jest/pull/15052))
 - `[jest-changed-files]` Abort `sl root` call if output resembles a steam locomotive ([#15053](https://github.com/jestjs/jest/pull/15053))
 - `[jest-circus]` [**BREAKING**] Prevent false test failures caused by promise rejections handled asynchronously ([#14315](https://github.com/jestjs/jest/pull/14315))

packages/expect/src/__tests__/asymmetricMatchers.test.ts

@@ -6,6 +6,7 @@
  *
  */
 
+import {runInNewContext} from 'node:vm';
 import jestExpect from '../';
 import {
   any,
@@ -51,6 +52,7 @@ test('Any.asymmetricMatch() on primitive wrapper classes', () => {
     any(Boolean).asymmetricMatch(new Boolean(true)),
     any(BigInt).asymmetricMatch(Object(1n)),
     any(Symbol).asymmetricMatch(Object(Symbol())),
+    any(Array).asymmetricMatch(runInNewContext('[];')),
     /* eslint-enable */
   ]) {
     jestExpect(test).toBe(true);

packages/expect/src/asymmetricMatchers.ts

@@ -136,6 +136,10 @@ class Any extends AsymmetricMatcher<any> {
       return typeof other == 'object';
     }
 
+    if (this.sample == Array) {
+      return Array.isArray(other);
+    }
+
     return other instanceof this.sample;
   }
 
@@ -164,6 +168,10 @@ class Any extends AsymmetricMatcher<any> {
       return 'boolean';
     }
 
+    if (Array.isArray(this.sample)) {
+      return 'array';
+    }
+
     return fnNameFor(this.sample);
   }