Gtk.TreeStore.prototype.set_column_types

function set_column_types(types:[GType]):void {
    // Gjs wrapper for gtk_tree_store_set_column_types()
}

This function is meant primarily for #GObjects that inherit from Gtk.TreeStore, and should only be used when constructing a new Gtk.TreeStore. It will not function after a row has been added, or a method on the Gtk.TreeModel interface is called.