GLib.IOChannel.prototype.set_close_on_unref

function set_close_on_unref(do_close: Boolean): void {
    // Gjs wrapper for g_io_channel_set_close_on_unref()
}

Setting this flag to true for a channel you have already closed can cause problems.

do_close: Whether to close the channel on the final unref of the GIOChannel data structure. The default value of this is true for channels created by g_io_channel_new_file (), and false for all other channels.