Merge pull request #539 from appuio/polyfill-clone

Add polyfill for structuredClone

src/polyfills.ts

@@ -51,3 +51,21 @@ import 'zone.js'; // Included with Angular CLI.
 /***************************************************************************************************
  * APPLICATION IMPORTS
  */
+
+/**
+ * structuredClone is somewhat recent, thus maybe not available in all browsers.
+ */
+(function () {
+  if (typeof structuredClone !== 'undefined') {
+    return;
+  }
+  function structuredClone<T>(obj: T): T {
+    const jsonString = JSON.stringify(obj);
+    return JSON.parse(jsonString);
+  }
+  if (typeof window !== 'undefined') {
+    window.structuredClone = structuredClone;
+  } else {
+    throw new Error('Could not attach structuredClone polyfill to the window object');
+  }
+})();