fix(create-app): pin jest and @jest/environment-jsdom-abstract to ~30.2.0

30.4.0 introduced synchronous require(ESM) that requires Node v24.9+,
breaking tests on Node 22. 30.3.0 pulls in @sinonjs/fake-timers@^15
which conflicts with @types/sinon@^17 (used by aws-sdk-client-mock).
30.2.0 avoids both issues cleanly.

Resets lockfile to a clean base-install from master constraints.

Signed-off-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

.changeset/create-app-pin-jest-30-3.md

@@ -2,4 +2,4 @@
 '@backstage/create-app': patch
 ---
 
-Pinned the Jest version range in app templates to `~30.3.0` to prevent automatic upgrades to Jest 30.4.x, which requires Node.js v24.9+ and breaks tests on Node 22.
+Pinned the Jest version range in app templates to `~30.2.0` to prevent automatic upgrades to Jest 30.4.x, which requires Node.js v24.9+ and breaks tests on Node 22.

package.json

@@ -133,7 +133,7 @@
     "@backstage/eslint-plugin": "workspace:*",
     "@backstage/repo-tools": "workspace:*",
     "@changesets/cli": "^2.14.0",
-    "@jest/environment-jsdom-abstract": "~30.3.0",
+    "@jest/environment-jsdom-abstract": "~30.2.0",
     "@octokit/rest": "^19.0.3",
     "@playwright/test": "^1.32.3",
     "@spotify/eslint-plugin": "^15.0.0",
@@ -162,7 +162,7 @@
     "eslint-plugin-testing-library": "^7.0.0",
     "fs-extra": "^11.2.0",
     "husky": "^9.0.0",
-    "jest": "~30.3.0",
+    "jest": "~30.2.0",
     "js-yaml": "^4.1.1",
     "jsdom": "^27",
     "lint-staged": "^16.0.0",

packages/cli/package.json

@@ -94,11 +94,11 @@
     "@backstage/plugin-scaffolder-node-test-utils": "workspace:^",
     "@backstage/test-utils": "workspace:^",
     "@backstage/theme": "workspace:^",
-    "@jest/environment-jsdom-abstract": "~30.3.0",
+    "@jest/environment-jsdom-abstract": "~30.2.0",
     "@types/fs-extra": "^11.0.0",
     "@types/jest": "^30.0.0",
     "@types/node": "^22.13.14",
-    "jest": "~30.3.0",
+    "jest": "~30.2.0",
     "jsdom": "^27.1.0",
     "nodemon": "^3.0.1"
   },

packages/create-app/templates/default-app/package.json.hbs

@@ -39,10 +39,10 @@
     "@backstage/cli": "^{{version '@backstage/cli'}}",
     "@backstage/cli-defaults": "^{{version '@backstage/cli-defaults'}}",
     "@backstage/e2e-test-utils": "^{{version '@backstage/e2e-test-utils'}}",
-    "@jest/environment-jsdom-abstract": "~30.3.0",
+    "@jest/environment-jsdom-abstract": "~30.2.0",
     "@playwright/test": "^1.32.3",
     "@types/jest": "^30.0.0",
-    "jest": "~30.3.0",
+    "jest": "~30.2.0",
     "jsdom": "^27.1.0",
     "node-gyp": "^10.0.0",
     "prettier": "^2.3.2",

packages/create-app/templates/legacy-app/package.json.hbs

@@ -52,10 +52,10 @@
     "@backstage/cli": "^{{version '@backstage/cli'}}",
     "@backstage/cli-defaults": "^{{version '@backstage/cli-defaults'}}",
     "@backstage/e2e-test-utils": "^{{version '@backstage/e2e-test-utils'}}",
-    "@jest/environment-jsdom-abstract": "~30.3.0",
+    "@jest/environment-jsdom-abstract": "~30.2.0",
     "@playwright/test": "^1.32.3",
     "@types/jest": "^30.0.0",
-    "jest": "~30.3.0",
+    "jest": "~30.2.0",
     "jsdom": "^27.1.0",
     "node-gyp": "^10.0.0",
     "prettier": "^2.3.2",