Fix type errors in older versions of Angular

code/frameworks/angular/package.json

@@ -115,6 +115,7 @@
   },
   "builders": "dist/builders/builders.json",
   "bundler": {
+    "post": "./scripts/postbuild.js",
     "tsConfig": "tsconfig.build.json"
   },
   "gitHead": "e6a7fd8a655c69780bc20b9749c2699e44beae17"

code/frameworks/angular/scripts/postbuild.js

@@ -0,0 +1,17 @@
+/**
+ * This postbuild fix is needed to add a ts-ignore to the generated public-types.d.ts file.
+ * The AngularCore.InputSignal and AngularCore.InputSignalWithTransform types do not exist in Angular
+ * versions < 17.2. In these versions, the unresolved types will error and prevent Storybook from starting/building.
+ * This postbuild script adds a ts-ignore statement above the unresolved types to prevent the errors.
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const filePath = path.join(__dirname, '../dist/client/public-types.d.ts');
+const fileContent = fs.readFileSync(filePath, 'utf8');
+const newContent = fileContent.replaceAll(
+  /(\[K in keyof T\]: T\[K\] extends AngularCore.InputSignal)/g,
+  ' // @ts-ignore\n   $1'
+);
+fs.writeFileSync(filePath, newContent, 'utf8');