Bump JSDOM to 21.x

Author: eps1lon

package.json

@@ -47,6 +47,7 @@
     "format": "kcd-scripts format",
     "install:csb": "npm install",
     "lint": "kcd-scripts lint",
+    "postinstall": "patch-package",
     "setup": "npm install && npm run validate -s",
     "test": "kcd-scripts test",
     "test:debug": "node --inspect-brk ./node_modules/.bin/jest --watch --runInBand",
@@ -68,14 +69,18 @@
     "lz-string": "^1.4.4",
     "pretty-format": "^27.0.2"
   },
+  "overrides": {
+    "jsdom": "^21.1.0"
+  },
   "devDependencies": {
     "@testing-library/jest-dom": "^5.11.6",
     "@types/lz-string": "^1.3.34",
     "jest-in-case": "^1.0.2",
     "jest-snapshot-serializer-ansi": "^1.0.0",
     "jest-watch-select-projects": "^2.0.0",
-    "jsdom": "20.0.0",
+    "jsdom": "^21.1.0",
     "kcd-scripts": "^13.0.0",
+    "patch-package": "^6.5.1",
     "typescript": "^4.1.2"
   },
   "eslintConfig": {

patches/jest-environment-jsdom+29.4.1.patch

@@ -0,0 +1,20 @@
+diff --git a/node_modules/jest-environment-jsdom/build/index.js b/node_modules/jest-environment-jsdom/build/index.js
+index f2f6731..7fcd5ed 100644
+--- a/node_modules/jest-environment-jsdom/build/index.js
++++ b/node_modules/jest-environment-jsdom/build/index.js
+@@ -161,15 +161,6 @@ class JSDOMEnvironment {
+         this.global.removeEventListener('error', this.errorEventListener);
+       }
+       this.global.close();
+-
+-      // Dispose "document" to prevent "load" event from triggering.
+-
+-      // Note that this.global.close() will trigger the CustomElement::disconnectedCallback
+-      // Do not reset the document before CustomElement disconnectedCallback function has finished running,
+-      // document should be accessible within disconnectedCallback.
+-      Object.defineProperty(this.global, 'document', {
+-        value: null
+-      });
+     }
+     this.errorEventListener = null;
+     // @ts-expect-error: this.global not allowed to be `null`