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Issue #2304 - Part 5 - Add cause property when a cause is present. I thought this was just to check whether it should be added, but is necessary.

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Brian Smith 2026-03-07 01:41:07 -06:00 • committed by OwnedByWuigi
commit 18eaf39766
1 changed files with 9 additions and 0 deletions
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9
js/src/vm/ErrorObject.cpp
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@ -469,6 +469,15 @@ js::ErrorObject::init(JSContext* cx, Handle<ErrorObject*> obj, JSExnType type,
MOZ_ASSERT(messageShape->slot() == MESSAGE_SLOT);
}
// Similar to the .message property, .cause is present only in some error
// objects -- |new Error("f", {cause: cause})| -- but not in other --
// |Error.prototype|, |new Error()|, |new Error("f")|.
if (cause.isSome()) {
if (!obj->addDataProperty(cx, cx->names().cause, CAUSE_SLOT, 0)) {
return false;
}
}
MOZ_ASSERT(obj->lookupPure(NameToId(cx->names().fileName))->slot() == FILENAME_SLOT);
MOZ_ASSERT(obj->lookupPure(NameToId(cx->names().lineNumber))->slot() == LINENUMBER_SLOT);
MOZ_ASSERT(obj->lookupPure(NameToId(cx->names().columnNumber))->slot() ==