fix: make jsdom accessible to extending environments (#12232)

Author: robin-drexler

CHANGELOG.md

@@ -18,6 +18,7 @@
 ### Fixes
 
 - `[expect]` Move typings of `.not`, `.rejects` and `.resolves` modifiers outside of `Matchers` interface ([#12346](https://github.com/facebook/jest/pull/12346))
+- `[jest-environment-jsdom]` Make `jsdom` accessible to extending environments again ([#12232](https://github.com/facebook/jest/pull/12232))
 - `[jest-phabricator]` [**BREAKING**] Convert to ESM ([#12341](https://github.com/facebook/jest/pull/12341))
 
 ### Chore & Maintenance

packages/jest-environment-jsdom/package.json

@@ -20,14 +20,14 @@
     "@jest/environment": "^27.5.1",
     "@jest/fake-timers": "^27.5.1",
     "@jest/types": "^27.5.1",
+    "@types/jsdom": "^16.2.4",
     "@types/node": "*",
     "jest-mock": "^27.5.1",
     "jest-util": "^27.5.1",
     "jsdom": "^19.0.0"
   },
   "devDependencies": {
-    "@jest/test-utils": "^27.5.1",
-    "@types/jsdom": "^16.2.4"
+    "@jest/test-utils": "^27.5.1"
   },
   "engines": {
     "node": "^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"

packages/jest-environment-jsdom/src/index.ts

@@ -23,7 +23,7 @@ type Win = Window &
   };
 
 export default class JSDOMEnvironment implements JestEnvironment<number> {
-  private dom: JSDOM | null;
+  dom: JSDOM | null;
   fakeTimers: LegacyFakeTimers<number> | null;
   fakeTimersModern: ModernFakeTimers | null;
   global: Win;