frontend-plugin-api: extract Expand to top-level types

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

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

@@ -21,7 +21,8 @@ import {
   createExtension,
   coreExtensionData,
 } from '../wiring';
-import { AnyExtensionInputMap, Expand } from '../wiring/createExtension';
+import { AnyExtensionInputMap } from '../wiring/createExtension';
+import { Expand } from '../types';
 
 /** @public */
 export function createApiExtension<

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

@@ -24,7 +24,8 @@ import {
   Extension,
   ExtensionInputValues,
 } from '../wiring';
-import { AnyExtensionInputMap, Expand } from '../wiring/createExtension';
+import { AnyExtensionInputMap } from '../wiring/createExtension';
+import { Expand } from '../types';
 
 /**
  * Helper for creating extensions for a routable React page component.

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

@@ -0,0 +1,22 @@
+/*
+ * 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.
+ */
+
+// TODO(Rugvip): This might be a quite useful utility type, maybe add to @backstage/types?
+/**
+ * Utility type to expand type aliases into their equivalent type.
+ * @ignore
+ */
+export type Expand<T> = T extends infer O ? { [K in keyof O]: O[K] } : never;

packages/frontend-plugin-api/src/wiring/createExtension.ts

@@ -15,6 +15,7 @@
  */
 
 import { PortableSchema } from '../schema';
+import { Expand } from '../types';
 import { ExtensionDataRef } from './createExtensionDataRef';
 import { ExtensionInput } from './createExtensionInput';
 import { BackstagePlugin } from './createPlugin';
@@ -32,13 +33,6 @@ export type AnyExtensionInputMap = {
   >;
 };
 
-// TODO(Rugvip): This might be a quite useful utility type, maybe add to @backstage/types?
-/**
- * Utility type to expand type aliases into their equivalent type.
- * @ignore
- */
-export type Expand<T> = T extends infer O ? { [K in keyof O]: O[K] } : never;
-
 /**
  * Converts an extension data map into the matching concrete data values type.
  * @public