Merge pull request #18194 from ashinsabu/fix-18172

fixes #18172: manifest type can now be undefined as well

.changeset/strong-crabs-flow.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-react': minor
+---
+
+Fixed typescript casting bug for useTemplateParameterSchema hook

plugins/scaffolder-react/alpha-api-report.md

@@ -289,7 +289,7 @@ export const useFormDataFromQuery: (
 
 // @alpha (undocumented)
 export const useTemplateParameterSchema: (templateRef: string) => {
-  manifest: TemplateParameterSchema;
+  manifest: TemplateParameterSchema | undefined;
   loading: boolean;
   error: Error | undefined;
 };

plugins/scaffolder-react/src/next/hooks/useTemplateParameterSchema.ts

@@ -29,5 +29,9 @@ export const useTemplateParameterSchema = (templateRef: string) => {
     [scaffolderApi, templateRef],
   );
 
-  return { manifest: value as TemplateParameterSchema, loading, error };
+  return {
+    manifest: value as TemplateParameterSchema | undefined,
+    loading,
+    error,
+  };
 };