frontend-plugin-api: runtime attachTo by reference

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

packages/frontend-internal/src/wiring/InternalExtensionInput.ts

@@ -0,0 +1,36 @@
+/*
+ * 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 { ExtensionInput } from '@backstage/frontend-plugin-api';
+import { OpaqueType } from '@internal/opaque';
+
+export type ExtensionInputContext = {
+  input: string;
+  kind?: string;
+  name?: string;
+};
+
+export const OpaqueExtensionInput = OpaqueType.create<{
+  public: ExtensionInput;
+  versions: {
+    readonly version: undefined;
+    readonly context?: ExtensionInputContext;
+    withContext(context: ExtensionInputContext): ExtensionInput;
+  };
+}>({
+  type: '@backstage/ExtensionInput',
+  versions: [undefined],
+});

packages/frontend-internal/src/wiring/index.ts

@@ -15,6 +15,10 @@
  */
 
 export { createExtensionDataContainer } from './createExtensionDataContainer';
-export { OpaqueSwappableComponentRef } from './InternalSwappableComponentRef';
 export { OpaqueExtensionDefinition } from './InternalExtensionDefinition';
+export {
+  OpaqueExtensionInput,
+  type ExtensionInputContext,
+} from './InternalExtensionInput';
 export { OpaqueFrontendPlugin } from './InternalFrontendPlugin';
+export { OpaqueSwappableComponentRef } from './InternalSwappableComponentRef';