LibJS: Grow storage when adding a property to uniquely-shaped Object

Normally the storage would be expanded by set_shape() upon transition
to a new shape, but if the shape is already unique, there is no new
transition so we have to expand the storage manually.

1 files changed, 10 insertions, 0 deletions

diff --git a/Libraries/LibJS/Tests/delete-globalThis-property-crash.js b/Libraries/LibJS/Tests/delete-globalThis-property-crash.js
new file mode 100644
index 0000000000..246d9debff
--- /dev/null
+++ b/Libraries/LibJS/Tests/delete-globalThis-property-crash.js
@@ -0,0 +1,10 @@
+load("test-common.js");
+
+try {
+    a = 1;
+    assert(delete globalThis.a === true);
+    a = 2;
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}