Replace JSON.parse(JSON.stringify(json)) with structuredClone

- see also https://developer.mozilla.org/en-US/docs/Web/API/Window/structuredClone
- fixes #4082

__tests__/src/selectors/manifests.test.js

@@ -506,7 +506,7 @@ describe('getManifestSearchService', () => {
   });
 
   it('supports v1 of the search spec', () => {
-    const v1 = JSON.parse(JSON.stringify(manifestFixtureFg165hz3589));
+    const v1 = structuredClone(manifestFixtureFg165hz3589);
     v1.service[0].profile = 'http://iiif.io/api/search/1/search';
     const state = { manifests: { x: { json: v1 } } };
     expect(getManifestSearchService(state, { manifestId: 'x' }).id).toEqual('https://contentsearch.stanford.edu/fg165hz3589/search');
@@ -525,7 +525,7 @@ describe('getManifestAutocompleteService', () => {
   });
 
   it('supports v1 of the search spec', () => {
-    const v1 = JSON.parse(JSON.stringify(manifestFixtureFg165hz3589));
+    const v1 = structuredClone(manifestFixtureFg165hz3589);
     v1.service[0].profile = 'http://iiif.io/api/search/1/search';
     v1.service[0].service.profile = 'http://iiif.io/api/search/1/autocomplete';
     const state = { manifests: { x: { json: v1 } } };

src/state/selectors/manifests.js

@@ -9,8 +9,8 @@ import { getConfig } from './config';
 /** */
 function createManifestoInstance(json, locale) {
   if (!json) return undefined;
-  // Use JSON stringify/parse to create a deep copy and prevent Manifesto from mutating the json
-  const manifestoObject = Utils.parseManifest(JSON.parse(JSON.stringify(json)), locale ? { locale } : undefined);
+  // Use structuredClone to create a deep copy and prevent Manifesto from mutating the json
+  const manifestoObject = Utils.parseManifest(structuredClone(json), locale ? { locale } : undefined);
   // Local patching of Manifesto so that when its a Collection, it behaves similarly
   if (typeof manifestoObject.getSequences != 'function') {
     manifestoObject.getSequences = () => [];