Merge branch 'main' into kmclb-make-any-match-missing-primitive-wrappers

CHANGELOG.md

@@ -4,19 +4,20 @@
 
 ### Fixes
 
-- `[expect]` Fix `.any()` checks on primitive wrapper classes ([11976](https://github.com/facebook/jest/pull/11976))
+- `[expect]` Make `expect` extension properties `configurable` ([#11978](https://github.com/facebook/jest/pull/11978))
+- `[expect]` Fix `.any()` checks on primitive wrapper classes ([#11976](https://github.com/facebook/jest/pull/11976))
 
 ### Chore & Maintenance
 
-- `[jest-config, jest-util]` Use `ci-info` instead of `is-ci` to detect CI environment ([11973](https://github.com/facebook/jest/pull/11973))
+- `[jest-config, jest-util]` Use `ci-info` instead of `is-ci` to detect CI environment ([#11973](https://github.com/facebook/jest/pull/11973))
 
 ### Performance
 
 ## 27.3.0
 
 ### Features
 
-- `[jest-config]` Add `testEnvironmentOptions.html` to apply to jsdom input ([11950](https://github.com/facebook/jest/pull/11950))
+- `[jest-config]` Add `testEnvironmentOptions.html` to apply to jsdom input ([#11950](https://github.com/facebook/jest/pull/11950))
 - `[jest-resolver]` Support default export (`.`) in `exports` field _if_ `main` is missing ([#11919](https://github.com/facebook/jest/pull/11919))
 
 ### Fixes

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

@@ -167,3 +167,21 @@ it('prints the Symbol into the error message', () => {
  }),
  ).toThrowErrorMatchingSnapshot();
 });
+
+it('allows overriding existing extension', () => {
+ jestExpect.extend({
+ toAllowOverridingExistingMatcher(_expected: unknown) {
+ return {pass: _expected === 'bar'};
+ },
+ });
+
+ jestExpect('foo').not.toAllowOverridingExistingMatcher();
+
+ jestExpect.extend({
+ toAllowOverridingExistingMatcher(_expected: unknown) {
+ return {pass: _expected === 'foo'};
+ },
+ });
+
+ jestExpect('foo').toAllowOverridingExistingMatcher();
+});

packages/expect/src/jestMatchersObject.ts

@@ -99,12 +99,18 @@ export const setMatchers = <State extends MatcherState = MatcherState>(
  }
 
  Object.defineProperty(expect, key, {
+ configurable: true,
+ enumerable: true,
  value: (...sample: [unknown, ...Array<unknown>]) =>
  new CustomMatcher(false, ...sample),
+ writable: true,
  });
  Object.defineProperty(expect.not, key, {
+ configurable: true,
+ enumerable: true,
  value: (...sample: [unknown, ...Array<unknown>]) =>
  new CustomMatcher(true, ...sample),
+ writable: true,
  });
  }
  });