chore: reworking how to override the page component

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

packages/frontend-plugin-api/src/extensions/NavItemBlueprint.ts

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2024 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 { IconComponent } from '@backstage/core-plugin-api';
+import { RouteRef } from '../routing';
+import { createExtensionBlueprint } from '../wiring';
+import { createNavItemExtension } from './createNavItemExtension';
+
+export const NavItemBlueprint = createExtensionBlueprint({
+  kind: 'nav-item',
+  attachTo: { id: 'app/nav', input: 'items' },
+  output: [createNavItemExtension.targetDataRef],
+  dataRefs: {
+    target: createNavItemExtension.targetDataRef,
+  },
+  factory: (
+    {
+      icon,
+      routeRef,
+    }: {
+      title: string;
+      icon: IconComponent;
+      routeRef: RouteRef<undefined>;
+    },
+    { config },
+  ) => [
+    createNavItemExtension.targetDataRef({
+      title: config.title,
+      icon,
+      routeRef,
+    }),
+  ],
+  config: {
+    schema: ({ title }) => ({
+      title: z => z.string().default(title),
+    }),
+  },
+});

packages/frontend-plugin-api/src/extensions/PageBlueprint.test.tsx

@@ -107,24 +107,23 @@ describe('PageBlueprint', () => {
   it('should allow defining additional inputs to the extension', async () => {
     const myPage = PageBlueprint.make({
       name: 'test-page',
-      params: {
-        loader: async ({ inputs }) => {
-          return (
-            <div data-testid="test">
-              {inputs.cards.map(c => c.get(coreExtensionData.reactElement))}
-            </div>
-          );
-        },
-        defaultPath: '/test',
-        routeRef: mockRouteRef,
-      },
-      /* todo(blam): need to fix the typescript here, as inputs is not the right type, wont let me merge without specifying parent opts */
       inputs: {
         cards: createExtensionInput([coreExtensionData.reactElement], {
           optional: false,
           singleton: false,
         }),
       },
+      factory(originalFactory, { inputs }) {
+        return originalFactory({
+          loader: async () => (
+            <div data-testid="test">
+              {inputs.cards.map(c => c.get(coreExtensionData.reactElement))}
+            </div>
+          ),
+          defaultPath: '/test',
+          routeRef: mockRouteRef,
+        });
+      },
     });
 
     const CardBlueprint = createExtensionBlueprint({