allow cloning resizable ArrayBuffers in the structuredClone polyfill

zloirock · Feb 21, 2023 · adf9681 · adf9681
1 parent 1fc7ae4
commit adf9681
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Allowed cloning resizable `ArrayBuffer`s in the `structuredClone` polyfill
 - Fixed wrong export in `/(stable|actual|full)/instance/unshift` entries, [#1207](https://github.com/zloirock/core-js/issues/1207)
 
 ##### [3.28.0 - 2023.02.14](https://github.com/zloirock/core-js/releases/tag/v3.28.0)

diff --git a/packages/core-js/modules/web.structured-clone.js b/packages/core-js/modules/web.structured-clone.js
@@ -147,7 +147,7 @@ var structuredCloneInternal = function (value, map) {
 
   var type = classof(value);
   var deep = false;
-  var C, name, cloned, dataTransfer, i, length, keys, key, source, target;
+  var C, name, cloned, dataTransfer, i, length, keys, key, source, target, options;
 
   switch (type) {
     case 'Array':
@@ -302,11 +302,12 @@ var structuredCloneInternal = function (value, map) {
           if (!C && typeof value.slice != 'function') throwUnpolyfillable(type);
           // detached buffers throws in `DataView` and `.slice`
           try {
-            if (typeof value.slice == 'function') {
+            if (typeof value.slice == 'function' && !value.resizable) {
               cloned = value.slice(0);
             } else {
               length = value.byteLength;
-              cloned = new ArrayBuffer(length);
+              options = 'maxByteLength' in value ? { maxByteLength: value.maxByteLength } : undefined;
+              cloned = new ArrayBuffer(length, options);
               source = new C(value);
               target = new C(cloned);
               for (i = 0; i < length; i++) {