Gtk.Widget.prototype.drag_source_set_target_list

function drag_source_set_target_list(target_list:Gtk.TargetList):void {
    // Gjs wrapper for gtk_drag_source_set_target_list()
}

Changes the target types that this widget offers for drag-and-drop. The widget must first be made into a drag source with Gtk.Widget.prototype.drag_source_set.

Since 2.4