Add createPageExtension

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Fredrik Adelöw <freben@gmail.com>

packages/app-next/src/examples/graphiqlPlugin.tsx

@@ -15,25 +15,15 @@
  */
 
 import {
-  createExtension,
+  createPageExtension,
   createPlugin,
-  coreExtensionData,
-  createSchemaFromZod,
 } from '@backstage/frontend-plugin-api';
-import { Router as GraphiQLPage } from '@backstage/plugin-graphiql';
+import React from 'react';
 
-export const GraphiqlPageExtension = createExtension({
-  output: {
-    component: coreExtensionData.reactComponent,
-    path: coreExtensionData.routePath,
-  },
-  configSchema: createSchemaFromZod(z =>
-    z.object({ path: z.string().default('/graphiql') }),
-  ),
-  factory({ bind, config }) {
-    bind.component(GraphiQLPage);
-    bind.path(config.path);
-  },
+export const GraphiqlPage = createPageExtension({
+  defaultPath: '/graphiql',
+  component: () =>
+    import('@backstage/plugin-graphiql').then(({ Router }) => <Router />),
 });
 
 export const graphiqlPlugin = createPlugin({
@@ -42,7 +32,7 @@ export const graphiqlPlugin = createPlugin({
     {
       id: 'graphiql.page',
       at: 'core.router/routes',
-      extension: GraphiqlPageExtension,
+      extension: GraphiqlPage,
     },
   ],
 });

packages/frontend-plugin-api/api-report.md

@@ -3,6 +3,8 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
+/// <reference types="react" />
+
 import { ComponentType } from 'react';
 import { JsonObject } from '@backstage/types';
 import { z } from 'zod';
@@ -77,6 +79,38 @@ export interface CreateExtensionOptions<
   output: TData;
 }
 
+// @public
+export function createPageExtension<
+  TConfig extends {
+    path: string;
+  },
+  TInputs extends Record<
+    string,
+    {
+      extensionData: AnyExtensionDataMap;
+    }
+  >,
+>(
+  options: (
+    | {
+        defaultPath: string;
+      }
+    | {
+        configSchema: PortableSchema<TConfig>;
+      }
+  ) & {
+    inputs?: TInputs;
+    component: (props: {
+      config: TConfig;
+      inputs: {
+        [pointName in keyof TInputs]: ExtensionDataValue<
+          TInputs[pointName]['extensionData']
+        >[];
+      };
+    }) => Promise<JSX.Element>;
+  },
+): Extension<TConfig>;
+
 // @public (undocumented)
 export function createPlugin(options: BackstagePluginOptions): BackstagePlugin;
 

packages/frontend-plugin-api/src/createPageExtension.tsx

@@ -0,0 +1,83 @@
+/*
+ * 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 from 'react';
+import { createSchemaFromZod, PortableSchema } from './createSchemaFromZod';
+import {
+  AnyExtensionDataMap,
+  coreExtensionData,
+  createExtension,
+  Extension,
+  ExtensionDataValue,
+} from './types';
+
+/**
+ * Helper for creating extensions for a routable React page component.
+ *
+ * @public
+ */
+export function createPageExtension<
+  TConfig extends { path: string },
+  TInputs extends Record<string, { extensionData: AnyExtensionDataMap }>,
+>(
+  options: (
+    | {
+        defaultPath: string;
+      }
+    | {
+        configSchema: PortableSchema<TConfig>;
+      }
+  ) & {
+    inputs?: TInputs;
+    component: (props: {
+      config: TConfig;
+      inputs: {
+        [pointName in keyof TInputs]: ExtensionDataValue<
+          TInputs[pointName]['extensionData']
+        >[];
+      };
+    }) => Promise<JSX.Element>;
+  },
+): Extension<TConfig> {
+  const configSchema =
+    'configSchema' in options
+      ? options.configSchema
+      : (createSchemaFromZod(z =>
+          z.object({ path: z.string().default(options.defaultPath) }),
+        ) as PortableSchema<TConfig>);
+
+  return createExtension({
+    output: {
+      component: coreExtensionData.reactComponent,
+      path: coreExtensionData.routePath,
+    },
+    inputs: options.inputs,
+    configSchema,
+    factory({ bind, config, inputs }) {
+      const LazyComponent = React.lazy(() =>
+        options
+          .component({ config, inputs })
+          .then(element => ({ default: () => element })),
+      );
+      bind.path(config.path);
+      bind.component(() => (
+        <React.Suspense fallback="...">
+          <LazyComponent />
+        </React.Suspense>
+      ));
+    },
+  });
+}

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

@@ -20,21 +20,22 @@
  * @packageDocumentation
  */
 
-export {
-  createExtension,
-  coreExtensionData,
-  createPlugin,
-  type ExtensionInstanceParameters,
-  type BackstagePlugin,
-  type Extension,
-  type AnyExtensionDataMap,
-  type BackstagePluginOptions,
-  type CreateExtensionOptions,
-  type ExtensionDataBind,
-  type ExtensionDataRef,
-  type ExtensionDataValue,
-} from './types';
+export { createPageExtension } from './createPageExtension';
 export {
   createSchemaFromZod,
   type PortableSchema,
 } from './createSchemaFromZod';
+export {
+  coreExtensionData,
+  createExtension,
+  createPlugin,
+  type AnyExtensionDataMap,
+  type BackstagePlugin,
+  type BackstagePluginOptions,
+  type CreateExtensionOptions,
+  type Extension,
+  type ExtensionDataBind,
+  type ExtensionDataRef,
+  type ExtensionDataValue,
+  type ExtensionInstanceParameters,
+} from './types';