LibJS: Don't assume [[GetOwnPropertyDescriptor]] always succeeds

It can fail if we're talking to a badly-behaved proxy when enumerating object properties for iteration.
Author: https://github.com/awesomekling Commit: 660d533b50 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4017
2025-08-21 18:00:16 +00:00 · 2025-03-19 13:23:38 -05:00 · 2025-03-19 13:23:38 -05:00 · 660d533b50 · 2025-03-20 17:52:44 +00:00
commit 660d533b50
parent 37c7eb14fe
2 changed files with 14 additions and 0 deletions
--- a/Libraries/LibJS/Tests/builtins/Proxy/iterate-over-proxy.js
+++ b/Libraries/LibJS/Tests/builtins/Proxy/iterate-over-proxy.js
@ -0,0 +1,12 @@
+test("iterate over bogus proxy", () => {
+    expect(() => {
+        let proxy = new Proxy([123], {
+            getOwnPropertyDescriptor: function (p) {
+                return undefined;
+            },
+        });
+
+        for (const p in proxy) {
+        }
+    }).toThrow();
+});