app-next-example-plugin: api report + fixes

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/app-next-example-plugin/api-report.md

@@ -0,0 +1,20 @@
+## API Report File for "app-next-example-plugin"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { BackstagePlugin } from '@backstage/frontend-plugin-api';
+import { default as React_2 } from 'react';
+
+// Warning: (ae-missing-release-tag) "examplePlugin" is part of the package's API, but it is missing a release tag (@alpha, @beta, @public, or @internal)
+//
+// @public (undocumented)
+export const examplePlugin: BackstagePlugin;
+
+// Warning: (ae-missing-release-tag) "ExampleSidebarItem" is part of the package's API, but it is missing a release tag (@alpha, @beta, @public, or @internal)
+//
+// @public (undocumented)
+export const ExampleSidebarItem: () => React_2.JSX.Element;
+
+// (No @packageDocumentation comment for this package)
+```

packages/app-next-example-plugin/src/ExampleSidebarItem.tsx

@@ -18,6 +18,7 @@ import React from 'react';
 import { SidebarItem } from '@backstage/core-components';
 import SaveIcon from '@material-ui/icons/Save';
 
+/** @public */
 export const ExampleSidebarItem = () => (
   <SidebarItem text="Example" to="/example" icon={SaveIcon} />
 );

packages/app-next-example-plugin/src/plugin.tsx

@@ -26,6 +26,7 @@ export const ExamplePage = createPageExtension({
   component: () => import('./Component').then(m => <m.Component />),
 });
 
+/** @public */
 export const examplePlugin = createPlugin({
   id: 'example',
   extensions: [ExamplePage],