Gtk.TreeStore.prototype.prepend

function prepend(parent:Gtk.TreeIter):void {
    // Gjs wrapper for gtk_tree_store_prepend()
}

Prepends a new row to tree_store. If parent is non-null, then it will prepend the new row before the first child of parent, otherwise it will prepend a row to the top level. iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you need to call Gtk.set or Gtk.set_value.