Support asymmetric matchers with equals in expect.extend (#10602)

src/bun.js/test/expect.zig

@@ -4977,7 +4977,7 @@ pub const ExpectMatcherContext = struct {
             return .zero;
         }
         const args = arguments.slice();
-        return JSValue.jsBoolean(args[0].deepEquals(args[1], globalObject));
+        return JSValue.jsBoolean(args[0].jestDeepEquals(args[1], globalObject));
     }
 };
 

test/js/bun/test/expect-extend.test.js

@@ -50,6 +50,9 @@ expect.extend({
 
     return { message, pass };
   },
+  _toCustomEqual(actual, expected) {
+    return { pass: this.equals(actual, expected) };
+  },
 
   // this matcher has not been defined through declaration merging, but expect.extends should allow it anyways,
   // type-enforcing the generic signature
@@ -340,3 +343,14 @@ it("should propagate errors from calling .toString() on the message callback val
     "i have successfully propagated the error message!",
   );
 });
+
+it("should support asymmetric matchers", () => {
+  expect(1)._toCustomEqual(expect.anything());
+  expect(1)._toCustomEqual(expect.any(Number));
+  expect({ a: "test" })._toCustomEqual({ a: expect.any(String) });
+  expect(() => expect(1)._toCustomEqual(expect.any(String))).toThrow();
+
+  expect(1).not._toCustomEqual(expect.any(String));
+  expect({ a: "test" }).not._toCustomEqual({ a: expect.any(Number) });
+  expect(() => expect(1).not._toCustomEqual(expect.any(Number))).toThrow();
+});

test/js/bun/test/expect-extend.types.d.ts

@@ -8,6 +8,7 @@ interface CustomMatchersForTest {
   _toBeDivisibleBy(value: number): any;
   _toBeSymbol(value: Symbol): any;
   _toBeWithinRange(floor: number, ceiling: number): any;
+  _toCustomEqual(value: any): any;
   _shouldNotError(): any;
   _toFailWithoutMessage(): any;
   _toBeOne(): any;