chore: migrate three packages to MSW v2

Migrates test files in config-loader, events-node and kubernetes-react
packages from MSW 1.x to MSW 2.x API to fix compatibility issues with
Jest 30 and JSDOM v26.

Changes:
- Updated msw dependency from ^1.0.0 to ^2.0.0
- Changed imports from `rest` to `http` and `HttpResponse`
- Converted handler syntax from `res(ctx.*)` to `HttpResponse.*`
- Changed `toStrictEqual` to `toEqual` for response assertions

Affected packages:
- @backstage/config-loader
- @backstage/plugin-events-node
- @backstage/plugin-kubernetes-react

Signed-off-by: Johan Persson <johanopersson@gmail.com>

packages/config-loader/package.json

@@ -57,7 +57,7 @@
     "@backstage/cli": "workspace:^",
     "@types/json-schema-merge-allof": "^0.6.0",
     "@types/minimist": "^1.2.5",
-    "msw": "^1.0.0",
+    "msw": "^2.0.0",
     "zen-observable": "^0.10.0"
   }
 }

packages/config-loader/src/loader.test.ts

@@ -17,7 +17,7 @@
 import { AppConfig } from '@backstage/config';
 import { loadConfig } from './loader';
 import fs from 'fs-extra';
-import { rest } from 'msw';
+import { http, HttpResponse } from 'msw';
 import { setupServer } from 'msw/node';
 import { createMockDirectory } from '@backstage/backend-test-utils';
 import { createDeferred } from '@backstage/types';
@@ -74,32 +74,28 @@ describe('loadConfig', () => {
   });
 
   const server = setupServer();
-  const initialLoaderHandler = rest.get(
+  const initialLoaderHandler = http.get(
     `https://some.domain.io/app-config.yaml`,
-    (_req, res, ctx) => {
-      return res(
-        ctx.body(
-          `app:
+    () => {
+      return new HttpResponse(
+        `app:
                     title: Remote Example App
                     sessionKey: 'abc123'
                     escaped: \$\${Escaped}
                   `,
-        ),
       );
     },
   );
 
-  const reloadHandler = rest.get(
+  const reloadHandler = http.get(
     `https://some.domain.io/app-config.yaml`,
-    (_req, res, ctx) => {
-      return res(
-        ctx.body(
-          `app:
+    () => {
+      return new HttpResponse(
+        `app:
                     title: NEW ReMOTe ExaMPLe App
                     sessionKey: 'abc123'
                     escaped: \$\${Escaped}
                   `,
-        ),
       );
     },
   );

packages/config-loader/src/sources/RemoteConfigSource.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { rest } from 'msw';
+import { http, HttpResponse } from 'msw';
 import { registerMswTestHooks } from '@backstage/backend-test-utils';
 import { setupServer } from 'msw/node';
 import { RemoteConfigSource } from './RemoteConfigSource';
@@ -26,15 +26,15 @@ describe('RemoteConfigSource', () => {
 
   it('should load config from a remote URL', async () => {
     worker.use(
-      rest.get('http://localhost/config.yaml', (_req, res, ctx) =>
-        res(
-          ctx.body(`
+      http.get(
+        'http://localhost/config.yaml',
+        () =>
+          new HttpResponse(`
 app:
   title: Example App
   substituted: \${VALUE}
   escaped: \$\${VALUE}
 `),
-        ),
       ),
     );
 
@@ -61,9 +61,10 @@ app:
 
   it('should load and parse config from a remote URL', async () => {
     worker.use(
-      rest.get('http://localhost/config.json', (_req, res, ctx) =>
-        res(
-          ctx.body(
+      http.get(
+        'http://localhost/config.json',
+        () =>
+          new HttpResponse(
             JSON.stringify({
               app: {
                 title: 'Example App',
@@ -72,7 +73,6 @@ app:
               },
             }),
           ),
-        ),
       ),
     );
 
@@ -102,12 +102,12 @@ app:
     let fetched = false;
 
     worker.use(
-      rest.get('http://localhost/config.yaml', (_req, res, ctx) => {
+      http.get('http://localhost/config.yaml', () => {
         if (!fetched) {
           fetched = true;
-          return res(ctx.body('x: 1'));
+          return new HttpResponse('x: 1');
         }
-        return res(ctx.body('x: 2'));
+        return new HttpResponse('x: 2');
       }),
     );