Function JS_GetOwnPropertyDescriptorById 

pub fn JS_GetOwnPropertyDescriptorById(
    cx: &mut JSContext,
    obj: HandleObject<'_>,
    id: HandleId<'_>,
    desc: MutableHandle<'_, PropertyDescriptor>,
    is_none: &mut bool,
) -> bool

Safe wrapper around js::rust::wrappers2::JS_GetOwnPropertyDescriptorById.