Allow null/undefined to be passed in to callbacks

Some functions do not require a callback to be passed in,
instead NULL is accepted, the same should be supported in gjs
by allowing null/undefined.

https://bugzilla.gnome.org/show_bug.cgi?id=603735

1 files changed, 5 insertions, 0 deletions

diff --git a/gi/function.c b/gi/function.c
index 5d403e8a..09bb09ff 100644
--- a/gi/function.c
+++ b/gi/function.c
@@ -382,6 +382,11 @@ gjs_callback_from_arguments(JSContext *context,
     if (is_notify)
         goto out;
 
+    if (JSVAL_IS_NULL(argv[*argv_pos]) || JSVAL_IS_VOID(argv[*argv_pos])) {
+        *closure = NULL;
+        return TRUE;
+    }
+
     invoke_info = gjs_callback_invoke_prepare(context,
                                               argv[*argv_pos],
                                               (GICallableInfo*)interface_info);