[angular] Use published version of dependency (#314)

Author: crisbeto

renderers/angular/package.json

@@ -2,7 +2,7 @@
   "name": "@a2ui/angular",
   "version": "0.8.1",
   "scripts": {
-    "build": "ng build"
+    "build": "ng build && node postprocess-build.mjs"
   },
   "dependencies": {
     "@a2ui/lit": "file:../lit",

renderers/angular/postprocess-build.mjs

@@ -0,0 +1,46 @@
+/*
+ Copyright 2025 Google LLC
+
+ 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
+
+      https://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 { readFileSync, writeFileSync } from 'fs';
+import { join } from 'path';
+
+// Locally we depend on the Lit package via a relative path so we can test it from source.
+// This breaks when published to npm so the following script updates the version to the npm one.
+
+const dirname = import.meta.dirname;
+const litVersion = parsePackageJson(join(dirname, '../lit/package.json')).version;
+
+if (!litVersion) {
+  throw new Error('Cannot determine version of Lit package');
+}
+
+const packageJsonPath = join(dirname, './dist/package.json');
+const packageJson = parsePackageJson(packageJsonPath);
+
+if (!packageJson.dependencies['@a2ui/lit']) {
+  throw new Error(
+    'Angular package does not depend on the Lit library. ' +
+      'Either update the package.json or remove this script.',
+  );
+}
+
+packageJson.dependencies['@a2ui/lit'] = '^' + litVersion;
+writeFileSync(packageJsonPath, JSON.stringify(packageJson, undefined, 2));
+
+function parsePackageJson(path) {
+  const content = readFileSync(path, 'utf8');
+  return JSON.parse(content);
+}