feat(frontend-plugin-api): create extension suspense

Signed-off-by: Camila Belo <camilaibs@gmail.com>

packages/frontend-plugin-api/src/components/ExtensionSuspense.tsx

@@ -0,0 +1,33 @@
+/*
+ * 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 React, { ReactNode, Suspense } from 'react';
+import { useApp } from '@backstage/core-plugin-api';
+
+/** @public */
+export interface ExtensionSuspenseProps {
+  children: ReactNode;
+}
+
+/** @public */
+export function ExtensionSuspense(props: ExtensionSuspenseProps) {
+  const { children } = props;
+
+  const app = useApp();
+  const { Progress } = app.getComponents();
+
+  return <Suspense fallback={<Progress />}>{children}</Suspense>;
+}

packages/frontend-plugin-api/src/components/index.ts

@@ -18,3 +18,8 @@ export {
   ExtensionBoundary,
   type ExtensionBoundaryProps,
 } from './ExtensionBoundary';
+
+export {
+  ExtensionSuspense,
+  type ExtensionSuspenseProps,
+} from './ExtensionSuspense';