Fix for issue 20256: Bug Report: converting circular structure to JSON error

Signed-off-by: bnechyporenko <bnechyporenko@bol.com>

plugins/scaffolder-react/package.json

@@ -66,6 +66,7 @@
     "@types/json-schema": "^7.0.9",
     "@types/react": "^16.13.1 || ^17.0.0",
     "classnames": "^2.2.6",
+    "flatted": "3.2.9",
     "humanize-duration": "^3.25.1",
     "immer": "^9.0.1",
     "json-schema": "^0.4.0",

plugins/scaffolder-react/src/next/lib/schema.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 import { JsonObject } from '@backstage/types';
+import { stringify, parse } from 'flatted';
 import { FieldValidation, UiSchema } from '@rjsf/utils';
 
 function isObject(value: unknown): value is JsonObject {
@@ -123,7 +124,7 @@ export const extractSchemaFromStep = (
   inputStep: JsonObject,
 ): { uiSchema: UiSchema; schema: JsonObject } => {
   const uiSchema: UiSchema = {};
-  const returnSchema: JsonObject = JSON.parse(JSON.stringify(inputStep));
+  const returnSchema: JsonObject = parse(stringify(inputStep));
   extractUiSchema(returnSchema, uiSchema);
   return { uiSchema, schema: returnSchema };
 };