frontend-app-api: add createAppGraph

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

packages/frontend-app-api/src/wiring/graph/createAppGraph.ts

@@ -0,0 +1,47 @@
+/*
+ * 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 {
+  BackstagePlugin,
+  Extension,
+  ExtensionOverrides,
+} from '@backstage/frontend-plugin-api';
+import { readAppExtensionsConfig } from './readAppExtensionsConfig';
+import { resolveAppGraph } from './resolveAppGraph';
+import { resolveAppNodeSpecs } from './resolveAppNodeSpecs';
+import { AppGraph } from './types';
+import { Config } from '@backstage/config';
+import { instantiateAppNodeTree } from './instantiateAppNodeTree';
+
+/** @internal */
+export interface CreateAppGraphOptions {
+  features: (BackstagePlugin | ExtensionOverrides)[];
+  builtinExtensions: Extension<unknown>[];
+  config: Config;
+}
+
+/** @internal */
+export function createAppGraph(options: CreateAppGraphOptions): AppGraph {
+  const appGraph = resolveAppGraph(
+    resolveAppNodeSpecs({
+      features: options.features,
+      builtinExtensions: options.builtinExtensions,
+      parameters: readAppExtensionsConfig(options.config),
+    }),
+  );
+  instantiateAppNodeTree(appGraph.root);
+  return appGraph;
+}

packages/frontend-app-api/src/wiring/graph/index.ts

@@ -20,3 +20,4 @@ export type {
   AppNodeInstance,
   AppNodeSpec,
 } from './types';
+export { createAppGraph } from './createAppGraph';