chore: fallback expect.extend to legacy

packages/playwright/src/matchers/expect.ts

@@ -140,8 +140,7 @@ function createExpect(info: ExpectMetaInfo, prefix: string[], customMatchers: Re
           const wrappedMatchers: any = {};
           const extendedMatchers: any = { ...customMatchers };
           for (const [name, matcher] of Object.entries(matchers)) {
-            const key = qualifiedMatcherName(qualifier, name);
-            wrappedMatchers[key] = function(...args: any[]) {
+            wrappedMatchers[name] = function(...args: any[]) {
               const { isNot, promise, utils } = this;
               const newThis: ExpectMatcherState = {
                 isNot,
@@ -152,6 +151,8 @@ function createExpect(info: ExpectMetaInfo, prefix: string[], customMatchers: Re
               (newThis as any).equals = throwUnsupportedExpectMatcherError;
               return (matcher as any).call(newThis, ...args);
             };
+            const key = qualifiedMatcherName(qualifier, name);
+            wrappedMatchers[key] = wrappedMatchers[name];
             Object.defineProperty(wrappedMatchers[key], 'name', { value: name });
             extendedMatchers[name] = wrappedMatchers[key];
           }

tests/playwright-test/expect.spec.ts

@@ -1068,4 +1068,38 @@ test('expect.extend should be immutable', async ({ runInlineTest }) => {
     'foo',
     'bar',
   ]);
-});
+});
+
+test('expect.extend should fall back to legacy behavior', async ({ runInlineTest }) => {
+  const result = await runInlineTest({
+    'expect-test.spec.ts': `
+      import { test, expect } from '@playwright/test';
+      expect.extend({
+        toFoo() {
+          console.log('%%foo');
+          return { pass: true };
+        }
+      });
+      expect.extend({
+        toFoo() {
+          console.log('%%foo2');
+          return { pass: true };
+        }
+      });
+      expect.extend({
+        toBar() {
+          console.log('%%bar');
+          return { pass: true };
+        }
+      });
+      test('logs', () => {
+        expect().toFoo();
+        expect().toBar();
+      });
+    `
+  });
+  expect(result.outputLines).toEqual([
+    'foo2',
+    'bar',
+  ]);
+});