feat: provide a decorated fetch environment for js-dom

Signed-off-by: blam <ben@blam.sh>

packages/cli/config/jest.js

@@ -48,7 +48,7 @@ function getRoleConfig(role) {
     case 'common-library':
     case 'frontend-plugin':
     case 'frontend-plugin-module':
-      return { testEnvironment: require.resolve('jest-environment-jsdom') };
+      return { testEnvironment: require.resolve('./jsdomEnvironment') };
     case 'cli':
     case 'backend':
     case 'node-library':

packages/cli/config/jsdomEnvironment.js

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import JSDOMEnvironment from 'jest-environment-jsdom';
+import { Headers, Request, Response } from 'node-fetch';
+
+// https://github.com/facebook/jest/blob/v29.4.3/website/versioned_docs/version-29.4/Configuration.md#testenvironment-string
+export default class FixJSDOMEnvironment extends JSDOMEnvironment {
+  constructor(...args) {
+    super(...args);
+
+    // FIXME https://github.com/jsdom/jsdom/issues/1724
+    this.global.fetch = fetch;
+    this.global.Headers = Headers;
+    this.global.Request = Request;
+    this.global.Response = Response;
+  }
+}